Weather in San Jose on 18 August 2026
Preliminary outlook for 18 August 2026
A preliminary estimate based on the 2020–2025 archive: daytime around +32°C and nighttime around +25°C, average precipitation 0 mm, wind around 3 m/s, humidity around 53%.
This is a climate-based estimate, not a precise long-range forecast. It is replaced by hourly data when the date enters the forecast window.
+30°C
Weather archive — latest year: 2025
Clear/Sunny
Weather archive — latest year: 2025
Nighttime: +27°C
Precipitation: 0 mm
Wind: 3 — 4 m/s
Humidity: 40%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +34°C | Sun hours | 13 h |
| UV index | 8 | Cloud cover (avg.) | 10% |
| Pressure (avg.) | 759 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +31°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +31°C | Wind chill (avg.) | +30°C |
| Wind gusts (max.) | 6 m/s | Wind direction (avg.) | 235° ↓ (SSW) |
Sunrise
07:28
Duration
13 h 28 min
Sunset
20:56
Moonrise
01:34
Moonset
17:20
Moon phase
Last Quarter
Illumination
29%
+28°C
Weather archive — for 2024 year
Clear/Sunny
Weather archive — for 2024 year
Nighttime: +25°C
Sea temperature: +26°C
Precipitation: 0 mm
Wind: 2 — 4 m/s
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +31°C | Sun hours | 13 h |
| UV index | 7 | Cloud cover (avg.) | 2% |
| Pressure (avg.) | 759 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | +26°C |
| Feels like (avg.) | +29°C | Dew point (avg.) | +18°C |
| Heat index (avg.) | +29°C | Wind chill (avg.) | +28°C |
| Wind gusts (max.) | 7 m/s | Wind direction (avg.) | 222° ↙ (SW) |
Sunrise
07:28
Duration
13 h 27 min
Sunset
20:55
Moonrise
20:28
Moonset
05:29
Moon phase
Waxing Gibbous
Illumination
93%
+29°C
Weather archive — for 2023 year
Clear/Sunny
Weather archive — for 2023 year
Nighttime: +24°C
Precipitation: 0 mm
Wind: 3 — 3 m/s
Humidity: 51%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +33°C | Sun hours | 13 h |
| UV index | 7 | Cloud cover (avg.) | 0% |
| Pressure (avg.) | 760 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +30°C | Dew point (avg.) | +17°C |
| Heat index (avg.) | +30°C | Wind chill (avg.) | +28°C |
| Wind gusts (max.) | 6 m/s | Wind direction (avg.) | 226° ↓ (SSW) |
Sunrise
07:28
Duration
13 h 28 min
Sunset
20:56
Moonrise
09:28
Moonset
22:21
Moon phase
Waxing Crescent
Illumination
9%
+27°C
Weather archive — for 2022 year
Clear/Sunny
Weather archive — for 2022 year
Nighttime: +24°C
Precipitation: 0 mm
Wind: 3 — 4 m/s
Humidity: 55%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +32°C | Sun hours | 13 h |
| UV index | 7 | Cloud cover (avg.) | 8% |
| Pressure (avg.) | 759 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +29°C | Dew point (avg.) | +17°C |
| Heat index (avg.) | +29°C | Wind chill (avg.) | +27°C |
| Wind gusts (max.) | 9 m/s | Wind direction (avg.) | 132° → (E) |
Sunrise
07:28
Duration
13 h 28 min
Sunset
20:56
Moonrise
00:15
Moonset
14:22
Moon phase
Last Quarter
Illumination
54%
+26°C
Weather archive — for 2021 year
Clear/Sunny
Weather archive — for 2021 year
Nighttime: +24°C
Precipitation: 0 mm
Wind: 3 — 3 m/s
Humidity: 75%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +28°C | Sun hours | 13 h |
| UV index | 7 | Cloud cover (avg.) | 16% |
| Pressure (avg.) | 763 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +28°C | Dew point (avg.) | +20°C |
| Heat index (avg.) | +28°C | Wind chill (avg.) | +26°C |
| Wind gusts (max.) | 8 m/s | Wind direction (avg.) | 120° ↘ (SE) |
Sunrise
07:28
Duration
13 h 28 min
Sunset
20:56
Moonrise
17:46
Moonset
02:24
Moon phase
Waxing Gibbous
Illumination
69%
+28°C
Weather archive — for 2020 year
Clear/Sunny
Weather archive — for 2020 year
Nighttime: +24°C
Precipitation: 0 mm
Wind: 2 — 3 m/s
Humidity: 46%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +32°C | Sun hours | 13 h |
| UV index | 7 | Cloud cover (avg.) | 0% |
| Pressure (avg.) | 760 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +29°C | Dew point (avg.) | +15°C |
| Heat index (avg.) | +29°C | Wind chill (avg.) | +28°C |
| Wind gusts (max.) | 7 m/s | Wind direction (avg.) | 210° ↘ (SE) |
Sunrise
07:28
Duration
13 h 27 min
Sunset
20:55
Moonrise
06:24
Moonset
20:54
Moon phase
New Moon
Illumination
0%
Weather in San Jose on 18 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+34°C
|
+27°C
|
+30°C | 13 h | 8 | 40% | 3 — 4 m/s |
| 2024 |
+31°C
|
+25°C
|
+28°C | 13 h | 7 | 53% | 2 — 4 m/s |
| 2023 |
+33°C
|
+24°C
|
+29°C | 13 h | 7 | 51% | 3 — 3 m/s |
| 2022 |
+32°C
|
+24°C
|
+27°C | 13 h | 7 | 55% | 3 — 4 m/s |
| 2021 |
+28°C
|
+24°C
|
+26°C | 13 h | 7 | 75% | 3 — 3 m/s |
| 2020 |
+32°C
|
+24°C
|
+28°C | 13 h | 7 | 46% | 2 — 3 m/s |