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September

Niteroi Weather in September with Sea Temperature

September weather in Niteroi includes average daytime air +28°C, nighttime +20°C, average sea temperature +24°C. Daily water temperatures usually range from +22°C to +25°C, which is mild for beach planning. The tables below also show air temperature, wind, rain and humidity; for near-term water data, open the current 30-day water temperature forecast.

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Averaged values across several years

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+27°C	+18°C	+22°C	3 m/s	0.2 mm	75%
2Tue	+27°C	+19°C	+24°C	3 m/s	0.3 mm	73%
3Wed	+29°C	+19°C	+23°C	2 m/s	0 mm	70%
4Thu	+28°C	+20°C	+23°C	3 m/s	0.1 mm	72%
5Fri	+26°C	+19°C	+23°C	2 m/s	0.3 mm	75%
6Sat	+24°C	+20°C	+23°C	3 m/s	0.2 mm	79%
7Sun	+25°C	+19°C	+24°C	3 m/s	0.2 mm	77%
8Mon	+29°C	+19°C	+24°C	3 m/s	0 mm	73%
9Tue	+31°C	+21°C	+23°C	2 m/s	0 mm	68%
10Wed	+29°C	+21°C	+24°C	2 m/s	0.1 mm	71%
11Thu	+28°C	+20°C	+24°C	2 m/s	0.1 mm	70%
12Fri	+30°C	+21°C	+24°C	2 m/s	0 mm	67%
13Sat	+30°C	+21°C	+24°C	2 m/s	0.3 mm	66%
14Sun	+30°C	+21°C	+24°C	3 m/s	0.2 mm	65%
15Mon	+25°C	+20°C	+24°C	3 m/s	0.9 mm	81%
16Tue	+26°C	+20°C	+24°C	3 m/s	0.9 mm	80%
17Wed	+28°C	+20°C	+24°C	2 m/s	0.2 mm	75%
18Thu	+29°C	+20°C	+25°C	2 m/s	0 mm	71%
19Fri	+29°C	+20°C	+25°C	3 m/s	0 mm	70%
20Sat	+29°C	+20°C	+23°C	3 m/s	0.3 mm	73%
21Sun	+28°C	+21°C	+24°C	3 m/s	0.6 mm	79%
22Mon	+26°C	+20°C	+24°C	3 m/s	3.5 mm	77%
23Tue	+24°C	+19°C	+23°C	3 m/s	1.6 mm	75%
24Wed	+27°C	+19°C	+23°C	3 m/s	0 mm	71%
25Thu	+26°C	+19°C	+23°C	2 m/s	0.3 mm	74%
26Fri	+28°C	+20°C	+23°C	2 m/s	0.5 mm	74%
27Sat	+29°C	+20°C	+23°C	2 m/s	0.4 mm	70%
28Sun	+26°C	+20°C	+23°C	3 m/s	0.5 mm	75%
29Mon	+25°C	+20°C	+23°C	3 m/s	0.7 mm	76%
30Tue	+27°C	+19°C	+24°C	3 m/s	0.1 mm	78%

Sea water temperature by months

Water +24°C

Day and night air temperature

Day +28°C Night +20°C

Weather highs and lows in Niteroi for september

Warmest day: 9 september, +31°C
Coldest night: 1 september, +18°C
Max precipitation: 22 september, 3.5 mm
Warmest sea water: 18 september, +25°C
Coldest sea water: 1 september, +22°C

Climate in Niteroi in september

Average daytime temperature: +28°C
Average nighttime temperature: +20°C
Sea water temperature: —
Precipitation (monthly average): 12.6 mm
Days with precipitation: 3.3
Humidity: 73%
Wind: 3 m/s
Data: 7 years / coverage 100%

Daily air temperature for the month

Day Night

Daily sea water temperature for the month

Water

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Mon	+26°C	+18°C	+22°C	4-6 m/s, E	0 mm	76%
2Tue	+25°C	+18°C	+24°C	4-6 m/s, E	0 mm	73%
3Wed	+28°C	+17°C	+23°C	3-5 m/s, ENE	0 mm	60%
4Thu	+29°C	+17°C	+23°C	3-4 m/s, NE	0 mm	57%
5Fri	+27°C	+18°C	+23°C	2-3 m/s, SSW	0 mm	58%
6Sat	+24°C	+19°C	+23°C	3-4 m/s, SW	0 mm	77%
7Sun	+20°C	+19°C	+24°C	4 m/s, ESE	1 mm	87%
8Mon	+26°C	+18°C	+24°C	4-6 m/s, ESE	0 mm	74%
9Tue	+32°C	+19°C	+23°C	3-4 m/s, NNW	0 mm	69%
10Wed	+23°C	+19°C	+24°C	3-4 m/s, SSW	0 mm	74%
11Thu	+26°C	+16°C	+24°C	2-4 m/s, SE	0 mm	71%
12Fri	+21°C	+18°C	+24°C	2-3 m/s, SSW	0.1 mm	78%
13Sat	+20°C	+19°C	+24°C	1-2 m/s, ENE	0.1 mm	74%
14Sun	+24°C	+18°C	+24°C	3-5 m/s, ESE	0 mm	68%
15Mon	+27°C	+17°C	+24°C	3-6 m/s, SSE	0 mm	72%
16Tue	+29°C	+18°C	+24°C	2-4 m/s, ESE	0.1 mm	70%
17Wed	+26°C	+20°C	+24°C	2-4 m/s, SW	0 mm	78%
18Thu	+26°C	+20°C	+25°C	2-4 m/s, SSE	0.1 mm	78%
19Fri	+29°C	+19°C	+25°C	2-4 m/s, SE	0 mm	69%
20Sat	+32°C	+21°C	+23°C	2-4 m/s, ESE	0 mm	62%
21Sun	+34°C	+21°C	+24°C	2-3 m/s, NNW	0 mm	57%
22Mon	+35°C	+21°C	+24°C	4-6 m/s, NW	1 mm	54%
23Tue	+22°C	+20°C	+23°C	3-7 m/s, SSW	10.3 mm	82%
24Wed	+24°C	+19°C	+23°C	2-3 m/s, SE	0.1 mm	75%
25Thu	+19°C	+17°C	+23°C	2-4 m/s, SSE	1.2 mm	85%
26Fri	+21°C	+17°C	+23°C	3-4 m/s, ESE	1.3 mm	74%
27Sat	+23°C	+15°C	+23°C	3-6 m/s, ESE	0 mm	61%
28Sun	+26°C	+15°C	+23°C	4-6 m/s, E	0 mm	60%
29Mon	+28°C	+18°C	+23°C	2 m/s, S	0 mm	58%
30Tue	+29°C	+18°C	+24°C	3-6 m/s, SSE	0 mm	68%

Weather highs and lows in Niteroi for september

Warmest day: 22 september, +35°C
Coldest night: 27 september, +15°C
Max precipitation: 23 september, 10.3 mm
Warmest water: 18 september, +25°C
Coldest water: 1 september, +22°C

Climate in Niteroi in september

Year: 2025
Average daytime temperature: +26°C
Average nighttime temperature: +18°C
Water temperature: +24°C
Precipitation (month): 15.3 mm
Days with precipitation: 5
Humidity: 70%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Sun	+30°C	+18°C	—	2 m/s, E	0 mm	68%
2Mon	+25°C	+21°C	—	3-5 m/s, WSW	0 mm	65%
3Tue	+27°C	+20°C	—	2-3 m/s, SSE	0 mm	77%
4Wed	+29°C	+19°C	—	2-3 m/s, SE	0 mm	74%
5Thu	+32°C	+20°C	—	2-4 m/s, E	0 mm	72%
6Fri	+24°C	+21°C	—	3-4 m/s, W	0.5 mm	82%
7Sat	+29°C	+20°C	—	2 m/s, SSE	0 mm	76%
8Sun	+31°C	+21°C	—	2-4 m/s, SE	0 mm	61%
9Mon	+30°C	+20°C	—	2-3 m/s, SE	0 mm	65%
10Tue	+32°C	+20°C	—	2 m/s, ESE	0 mm	58%
11Wed	+34°C	+22°C	—	2-3 m/s, NNE	0 mm	44%
12Thu	+34°C	+23°C	—	2-3 m/s, N	0 mm	42%
13Fri	+35°C	+23°C	—	2 m/s, N	0 mm	41%
14Sat	+35°C	+23°C	—	3-4 m/s, N	0 mm	47%
15Sun	+28°C	+22°C	—	3-4 m/s, SW	0.2 mm	73%
16Mon	+27°C	+21°C	—	3-6 m/s, SW	0.1 mm	76%
17Tue	+21°C	+20°C	—	2-4 m/s, SSE	0.8 mm	82%
18Wed	+24°C	+19°C	—	4-6 m/s, ESE	0 mm	74%
19Thu	+27°C	+18°C	—	4-6 m/s, SE	0 mm	66%
20Fri	+31°C	+19°C	—	3-5 m/s, ESE	0 mm	66%
21Sat	+29°C	+21°C	—	2-3 m/s, SSE	0 mm	76%
22Sun	+30°C	+21°C	—	2-3 m/s, SE	0.1 mm	73%
23Mon	+31°C	+22°C	—	3-5 m/s, SSE	0 mm	68%
24Tue	+31°C	+22°C	—	3-6 m/s, SE	0 mm	62%
25Wed	+33°C	+22°C	—	2-3 m/s, ENE	0 mm	56%
26Thu	+34°C	+23°C	—	2-4 m/s, NE	0 mm	52%
27Fri	+31°C	+22°C	—	3-4 m/s, SSW	0.1 mm	60%
28Sat	+22°C	+21°C	—	3-4 m/s, S	0.4 mm	84%
29Sun	+27°C	+21°C	—	4-6 m/s, SE	0 mm	65%
30Mon	+30°C	+19°C	—	4-6 m/s, SE	0 mm	68%

Weather highs and lows in Niteroi for september

Warmest day: 13 september, +35°C
Coldest night: 1 september, +18°C
Max precipitation: 17 september, 0.8 mm
Warmest water: —
Coldest water: —

Climate in Niteroi in september

Year: 2024
Average daytime temperature: +29°C
Average nighttime temperature: +21°C
Water temperature: —
Precipitation (month): 2.2 mm
Days with precipitation: 0
Humidity: 66%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Fri	+27°C	+19°C	—	2-5 m/s, ESE	0 mm	80%
2Sat	+29°C	+18°C	—	3 m/s, ENE	0 mm	71%
3Sun	+29°C	+20°C	—	2-3 m/s, SSE	0 mm	70%
4Mon	+32°C	+22°C	—	2-3 m/s, ENE	0 mm	70%
5Tue	+28°C	+21°C	—	3-5 m/s, WSW	0 mm	73%
6Wed	+21°C	+20°C	—	3-4 m/s, SSW	0.4 mm	89%
7Thu	+25°C	+19°C	—	2-3 m/s, SE	0.1 mm	80%
8Fri	+29°C	+19°C	—	2-3 m/s, NNE	0 mm	72%
9Sat	+30°C	+20°C	—	2 m/s, WSW	0 mm	63%
10Sun	+27°C	+21°C	—	2-3 m/s, SW	0 mm	73%
11Mon	+30°C	+20°C	—	2-4 m/s, E	0 mm	71%
12Tue	+31°C	+20°C	—	2-3 m/s, NE	0 mm	56%
13Wed	+32°C	+21°C	—	2-4 m/s, NNE	0 mm	58%
14Thu	+30°C	+21°C	—	4-6 m/s, WSW	0.4 mm	60%
15Fri	+20°C	+18°C	—	2-3 m/s, S	4.3 mm	91%
16Sat	+27°C	+17°C	—	2-3 m/s, ESE	0 mm	76%
17Sun	+32°C	+21°C	—	2-3 m/s, E	0 mm	68%
18Mon	+33°C	+21°C	—	2-3 m/s, ESE	0 mm	59%
19Tue	+31°C	+21°C	—	2 m/s, SE	0 mm	55%
20Wed	+28°C	+21°C	—	2 m/s, SSE	0 mm	67%
21Thu	+30°C	+21°C	—	3-5 m/s, SE	0 mm	70%
22Fri	+32°C	+22°C	—	2-3 m/s, SE	0 mm	59%
23Sat	+29°C	+22°C	—	2-3 m/s, SSW	0 mm	68%
24Sun	+35°C	+22°C	—	1-3 m/s, ESE	0 mm	63%
25Mon	+29°C	+23°C	—	3-4 m/s, SW	0 mm	70%
26Tue	+31°C	+22°C	—	2-4 m/s, ESE	0.1 mm	76%
27Wed	+37°C	+24°C	—	3-4 m/s, NNW	0.4 mm	51%
28Thu	+24°C	+20°C	—	5-6 m/s, SW	0.8 mm	79%
29Fri	+24°C	+19°C	—	3-4 m/s, ESE	0.1 mm	72%
30Sat	+27°C	+18°C	—	4-6 m/s, ESE	0 mm	73%

Weather highs and lows in Niteroi for september

Warmest day: 27 september, +37°C
Coldest night: 16 september, +17°C
Max precipitation: 15 september, 4.3 mm
Warmest water: —
Coldest water: —

Climate in Niteroi in september

Year: 2023
Average daytime temperature: +29°C
Average nighttime temperature: +20°C
Water temperature: —
Precipitation (month): 6.6 mm
Days with precipitation: 1
Humidity: 69%
Wind: 2 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Thu	+27°C	+14°C	—	3-4 m/s, E	0 mm	68%
2Fri	+30°C	+15°C	—	3 m/s, NE	0 mm	60%
3Sat	+27°C	+19°C	—	3-4 m/s, ESE	0 mm	59%
4Sun	+20°C	+18°C	—	4-5 m/s, SW	0.5 mm	86%
5Mon	+21°C	+16°C	—	2-4 m/s, E	0.1 mm	74%
6Tue	+25°C	+18°C	—	4-5 m/s, E	0 mm	65%
7Wed	+27°C	+16°C	—	3-4 m/s, WSW	0 mm	64%
8Thu	+30°C	+17°C	—	3-4 m/s, E	0 mm	62%
9Fri	+36°C	+21°C	—	2-3 m/s, ENE	0 mm	52%
10Sat	+32°C	+21°C	—	3-5 m/s, ESE	0 mm	62%
11Sun	+21°C	+19°C	—	3 m/s, SSE	0.7 mm	75%
12Mon	+25°C	+18°C	—	3-5 m/s, ESE	0 mm	72%
13Tue	+30°C	+18°C	—	2-3 m/s, WSW	1.8 mm	79%
14Wed	+26°C	+20°C	—	3-5 m/s, SW	0.1 mm	83%
15Thu	+22°C	+19°C	—	2-3 m/s, SSE	1.5 mm	89%
16Fri	+19°C	+17°C	—	2-3 m/s, S	5.7 mm	94%
17Sat	+21°C	+16°C	—	3-4 m/s, SW	0.5 mm	75%
18Sun	+22°C	+15°C	—	2-3 m/s, ENE	0.2 mm	72%
19Mon	+26°C	+15°C	—	3-4 m/s, E	0 mm	73%
20Tue	+25°C	+17°C	—	2-4 m/s, WSW	0 mm	80%
21Wed	+24°C	+20°C	—	2-3 m/s, SSE	0 mm	92%
22Thu	+25°C	+20°C	—	2-4 m/s, ESE	1.2 mm	94%
23Fri	+21°C	+18°C	—	4-6 m/s, SW	0 mm	86%
24Sat	+21°C	+16°C	—	2-3 m/s, SW	0 mm	68%
25Sun	+24°C	+17°C	—	3-4 m/s, ESE	0 mm	71%
26Mon	+25°C	+18°C	—	2 m/s, SE	0 mm	80%
27Tue	+25°C	+19°C	—	2-3 m/s, SSW	2.3 mm	90%
28Wed	+21°C	+20°C	—	2-3 m/s, SW	0.9 mm	94%
29Thu	+20°C	+19°C	—	3-4 m/s, SSE	4.6 mm	94%
30Fri	+20°C	+18°C	—	3 m/s, E	0.1 mm	89%

Weather highs and lows in Niteroi for september

Warmest day: 9 september, +36°C
Coldest night: 1 september, +14°C
Max precipitation: 16 september, 5.7 mm
Warmest water: —
Coldest water: —

Climate in Niteroi in september

Year: 2022
Average daytime temperature: +25°C
Average nighttime temperature: +18°C
Water temperature: —
Precipitation (month): 20.2 mm
Days with precipitation: 6
Humidity: 77%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Wed	+25°C	+18°C	—	3-4 m/s, E	0.3 mm	78%
2Thu	+28°C	+18°C	—	2-3 m/s, E	0.1 mm	77%
3Fri	+31°C	+19°C	—	2 m/s, E	0 mm	70%
4Sat	+30°C	+21°C	—	3-4 m/s, ENE	0 mm	64%
5Sun	+25°C	+19°C	—	2-3 m/s, ESE	0 mm	81%
6Mon	+25°C	+20°C	—	2-3 m/s, SW	0.1 mm	82%
7Tue	+23°C	+21°C	—	3-4 m/s, ESE	0.2 mm	82%
8Wed	+29°C	+20°C	—	3-4 m/s, E	0 mm	79%
9Thu	+31°C	+22°C	—	2-3 m/s, SW	0 mm	76%
10Fri	+27°C	+21°C	—	2 m/s, SSW	0.6 mm	87%
11Sat	+25°C	+21°C	—	2 m/s, SSW	0 mm	88%
12Sun	+28°C	+21°C	—	2-3 m/s, SSW	0 mm	86%
13Mon	+33°C	+21°C	—	2 m/s, E	0 mm	77%
14Tue	+38°C	+22°C	—	2 m/s, NE	0 mm	56%
15Wed	+29°C	+23°C	—	3-4 m/s, SW	0 mm	74%
16Thu	+23°C	+21°C	—	3-4 m/s, SSE	0.5 mm	89%
17Fri	+24°C	+21°C	—	3-4 m/s, ESE	0.1 mm	88%
18Sat	+31°C	+20°C	—	2-3 m/s, E	0 mm	74%
19Sun	+30°C	+21°C	—	2-3 m/s, SSW	0.1 mm	77%
20Mon	+30°C	+21°C	—	3-4 m/s, E	0 mm	78%
21Tue	+32°C	+21°C	—	4-5 m/s, WNW	0.3 mm	77%
22Wed	+21°C	+19°C	—	5-6 m/s, SSW	1.4 mm	78%
23Thu	+24°C	+16°C	—	3-4 m/s, ESE	0.1 mm	58%
24Fri	+28°C	+16°C	—	3-5 m/s, E	0 mm	66%
25Sat	+29°C	+18°C	—	3-4 m/s, ESE	0 mm	69%
26Sun	+31°C	+20°C	—	2-3 m/s, E	0 mm	69%
27Mon	+30°C	+20°C	—	2-4 m/s, SE	0.1 mm	74%
28Tue	+32°C	+20°C	—	3-5 m/s, E	0 mm	75%
29Wed	+29°C	+22°C	—	2-3 m/s, SW	0 mm	74%
30Thu	+27°C	+20°C	—	3-4 m/s, WSW	0.3 mm	83%

Weather highs and lows in Niteroi for september

Warmest day: 14 september, +38°C
Coldest night: 23 september, +16°C
Max precipitation: 22 september, 1.4 mm
Warmest water: —
Coldest water: —

Climate in Niteroi in september

Year: 2021
Average daytime temperature: +28°C
Average nighttime temperature: +20°C
Water temperature: —
Precipitation (month): 4.2 mm
Days with precipitation: 1
Humidity: 76%
Wind: 3 m/s

Daily air temperature for the month

Day Night

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September	Day	Night	Sea t°	Wind	Precip	Humidity
1Tue	+26°C	+21°C	—	2-3 m/s, SE	1 mm	76%
2Wed	+27°C	+21°C	—	2-4 m/s, E	1.5 mm	77%
3Thu	+31°C	+19°C	—	2-3 m/s, NE	0 mm	62%
4Fri	+32°C	+21°C	—	2 m/s, SE	0 mm	58%
5Sat	+29°C	+21°C	—	2-3 m/s, SW	0 mm	78%
6Sun	+31°C	+21°C	—	2 m/s, E	0 mm	72%
7Mon	+28°C	+22°C	—	2-3 m/s, SW	0 mm	69%
8Tue	+28°C	+21°C	—	2-3 m/s, SSE	0 mm	80%
9Wed	+29°C	+22°C	—	3-5 m/s, E	0.1 mm	74%
10Thu	+33°C	+21°C	—	2-3 m/s, E	0 mm	71%
11Fri	+29°C	+22°C	—	2-3 m/s, SW	0 mm	72%
12Sat	+34°C	+22°C	—	2-4 m/s, ENE	0 mm	68%
13Sun	+34°C	+22°C	—	3-4 m/s, ENE	0 mm	50%
14Mon	+36°C	+22°C	—	2-3 m/s, NE	0 mm	52%
15Tue	+24°C	+22°C	—	4-5 m/s, S	0.5 mm	78%
16Wed	+29°C	+22°C	—	3-4 m/s, E	0 mm	76%
17Thu	+35°C	+21°C	—	3-4 m/s, E	0 mm	64%
18Fri	+29°C	+22°C	—	3 m/s, SW	0 mm	76%
19Sat	+34°C	+23°C	—	2 m/s, E	0 mm	68%
20Sun	+25°C	+21°C	—	3-4 m/s, SSW	1.8 mm	82%
21Mon	+23°C	+20°C	—	2-3 m/s, SE	3.4 mm	88%
22Tue	+21°C	+18°C	—	6-7 m/s, ESE	18.8 mm	90%
23Wed	+23°C	+18°C	—	3-4 m/s, ESE	0 mm	85%
24Thu	+25°C	+19°C	—	3 m/s, E	0.1 mm	85%
25Fri	+29°C	+20°C	—	2-3 m/s, E	0 mm	80%
26Sat	+30°C	+21°C	—	2 m/s, ESE	0 mm	76%
27Sun	+36°C	+23°C	—	2 m/s, S	0 mm	64%
28Mon	+37°C	+24°C	—	2-3 m/s, WNW	0 mm	50%
29Tue	+26°C	+23°C	—	3-4 m/s, SSE	0 mm	77%
30Wed	+31°C	+23°C	—	3-4 m/s, E	0 mm	78%

Weather highs and lows in Niteroi for september

Warmest day: 28 september, +37°C
Coldest night: 22 september, +18°C
Max precipitation: 22 september, 18.8 mm
Warmest water: —
Coldest water: —

Climate in Niteroi in september

Year: 2020
Average daytime temperature: +30°C
Average nighttime temperature: +21°C
Water temperature: —
Precipitation (month): 27.2 mm
Days with precipitation: 5
Humidity: 73%
Wind: 3 m/s

Daily air temperature for the month

Day Night

Tap a date to open detailed weather for that day

September	Day	Night	Sea t°	Wind	Precip	Humidity
1Sun	+26°C	+21°C	—	2 m/s, SW	0.2 mm	82%
2Mon	+25°C	+21°C	—	2-3 m/s, E	0.6 mm	91%
3Tue	+27°C	+21°C	—	2-4 m/s, E	0.1 mm	91%
4Wed	+24°C	+20°C	—	3-4 m/s, SW	0.3 mm	94%
5Thu	+21°C	+18°C	—	3-4 m/s, SE	1.8 mm	92%
6Fri	+20°C	+18°C	—	3-4 m/s, E	0.1 mm	88%
7Sat	+25°C	+18°C	—	3-5 m/s, E	0 mm	84%
8Sun	+28°C	+19°C	—	3-4 m/s, ENE	0 mm	82%
9Mon	+31°C	+20°C	—	3 m/s, NE	0 mm	78%
10Tue	+31°C	+21°C	—	2-3 m/s, ENE	0 mm	71%
11Wed	+30°C	+23°C	—	2 m/s, E	0 mm	71%
12Thu	+34°C	+22°C	—	2 m/s, NE	0 mm	68%
13Fri	+26°C	+21°C	—	3-4 m/s, WSW	0.2 mm	84%
14Sat	+23°C	+21°C	—	3-4 m/s, SE	0.8 mm	92%
15Sun	+27°C	+20°C	—	3-5 m/s, ESE	0 mm	88%
16Mon	+29°C	+21°C	—	3 m/s, E	0 mm	82%
17Tue	+34°C	+22°C	—	2-3 m/s, E	0 mm	70%
18Wed	+35°C	+22°C	—	2-3 m/s, E	0 mm	66%
19Thu	+28°C	+22°C	—	3-4 m/s, S	0 mm	80%
20Fri	+30°C	+22°C	—	3-4 m/s, SSE	0 mm	76%
21Sat	+24°C	+21°C	—	3-4 m/s, SW	0.4 mm	92%
22Sun	+21°C	+19°C	—	3-4 m/s, S	1.8 mm	94%
23Mon	+20°C	+17°C	—	4 m/s, SE	1.1 mm	80%
24Tue	+22°C	+16°C	—	4 m/s, E	0 mm	78%
25Wed	+21°C	+18°C	—	2 m/s, E	0.8 mm	86%
26Thu	+21°C	+19°C	—	1-2 m/s, ENE	2.2 mm	94%
27Fri	+23°C	+18°C	—	2-4 m/s, WSW	0.2 mm	88%
28Sat	+23°C	+19°C	—	2-3 m/s, S	1.1 mm	84%
29Sun	+21°C	+19°C	—	3-4 m/s, E	0.5 mm	90%
30Mon	+22°C	+18°C	—	3-4 m/s, E	0 mm	87%

Weather highs and lows in Niteroi for september

Warmest day: 18 september, +35°C
Coldest night: 24 september, +16°C
Max precipitation: 26 september, 2.2 mm
Warmest water: —
Coldest water: —

Climate in Niteroi in september

Year: 2019
Average daytime temperature: +26°C
Average nighttime temperature: +20°C
Water temperature: —
Precipitation (month): 12.2 mm
Days with precipitation: 5
Humidity: 83%
Wind: 3 m/s

Weather in Niteroi in september by year

Year	Day	Night	Precipitation	Days with precipitation	Water
2025	+26°C	+18°C	15.3 mm	5	+24°C
2024	+29°C	+21°C	2.2 mm	0	—
2023	+29°C	+20°C	6.6 mm	1	—
2022	+25°C	+18°C	20.2 mm	6	—
2021	+28°C	+20°C	4.2 mm	1	—
2020	+30°C	+21°C	27.2 mm	5	—
2019	+26°C	+20°C	12.2 mm	5	—

Comparison september in Niteroi with other months

Month	Day	Night	Days with precipitation	Sunny days
January	+30°C	+24°C	7	9
February	+30°C	+24°C	7	8
March	+30°C	+23°C	5	11
April	+28°C	+21°C	4	11
May	+27°C	+20°C	3	16
June	+26°C	+19°C	3	17
July	+26°C	+18°C	2	19
August	+26°C	+18°C	3	18
September	+28°C	+20°C	3	16
October	+27°C	+21°C	7	7
November	+27°C	+21°C	8	7
December	+29°C	+22°C	8	7