Weather in Samui on 18 August 2026
Preliminary outlook for 18 August 2026
A preliminary estimate based on the 2019–2025 archive: daytime around +30°C and nighttime around +27°C, average precipitation 0.1 mm, wind around 3 m/s, humidity around 73%.
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.
+28°C
Weather archive — latest year: 2025
Clear/Sunny
Weather archive — latest year: 2025
Nighttime: +28°C
Precipitation: 0.2 mm
Wind: 3 — 4 m/s
Humidity: 72%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +29°C | Sun hours | 10 h |
| UV index | 7 | Cloud cover (avg.) | 33% |
| Pressure (avg.) | 758 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +32°C | Dew point (avg.) | +23°C |
| Heat index (avg.) | +32°C | Wind chill (avg.) | +29°C |
| Wind gusts (max.) | 6 m/s | Wind direction (avg.) | 211° ↙ (WSW) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
01:09
Moonset
14:21
Moon phase
Last Quarter
Illumination
29%
+29°C
Weather archive — for 2024 year
Patchy rain nearby
Weather archive — for 2024 year
Nighttime: +29°C
Precipitation: 0.2 mm
Wind: 2 — 2 m/s
Humidity: 72%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +30°C | Sun hours | 4 h |
| UV index | 6 | Cloud cover (avg.) | 75% |
| Pressure (avg.) | 757 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +33°C | Dew point (avg.) | +24°C |
| Heat index (avg.) | +33°C | Wind chill (avg.) | +29°C |
| Wind gusts (max.) | 4 m/s | Wind direction (avg.) | 224° ← (WNW) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
17:33
Moonset
04:27
Moon phase
Waxing Gibbous
Illumination
93%
+28°C
Weather archive — for 2023 year
Cloudy
Weather archive — for 2023 year
Nighttime: +28°C
Precipitation: 0 mm
Wind: 5 — 6 m/s
Humidity: 76%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +30°C | Sun hours | 9 h |
| UV index | 7 | Cloud cover (avg.) | 51% |
| Pressure (avg.) | 757 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +33°C | Dew point (avg.) | +24°C |
| Heat index (avg.) | +33°C | Wind chill (avg.) | +29°C |
| Wind gusts (max.) | 9 m/s | Wind direction (avg.) | 279° ← (WNW) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
07:31
Moonset
20:01
Moon phase
Waxing Crescent
Illumination
9%
+29°C
Weather archive — for 2022 year
Partly Cloudy
Weather archive — for 2022 year
Nighttime: +28°C
Precipitation: 0.2 mm
Wind: 4 — 6 m/s
Humidity: 72%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +31°C | Sun hours | 9 h |
| UV index | 6 | Cloud cover (avg.) | 60% |
| Pressure (avg.) | 755 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +33°C | Dew point (avg.) | +24°C |
| Heat index (avg.) | +33°C | Wind chill (avg.) | +29°C |
| Wind gusts (max.) | 9 m/s | Wind direction (avg.) | 270° ← (W) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
23:30
Moonset
11:30
Moon phase
Waning Gibbous
Illumination
54%
+27°C
Weather archive — for 2021 year
Clear/Sunny
Weather archive — for 2021 year
Nighttime: +24°C
Precipitation: 0 mm
Wind: 3 — 4 m/s
Humidity: 73%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +28°C | Sun hours | 11 h |
| UV index | 6 | Cloud cover (avg.) | 48% |
| Pressure (avg.) | 757 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +31°C | Dew point (avg.) | +23°C |
| Heat index (avg.) | +31°C | Wind chill (avg.) | +28°C |
| Wind gusts (max.) | 7 m/s | Wind direction (avg.) | 309° ↖ (NW) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
14:56
Moonset
01:48
Moon phase
Waxing Gibbous
Illumination
69%
+28°C
Weather archive — for 2020 year
Patchy rain nearby
Weather archive — for 2020 year
Nighttime: +26°C
Precipitation: 0.1 mm
Wind: 3 — 4 m/s
Humidity: 74%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +29°C | Sun hours | 8 h |
| UV index | 7 | Cloud cover (avg.) | 42% |
| Pressure (avg.) | 756 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +31°C | Dew point (avg.) | +24°C |
| Heat index (avg.) | +31°C | Wind chill (avg.) | +28°C |
| Wind gusts (max.) | 7 m/s | Wind direction (avg.) | 241° ← (W) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
05:11
Moonset
18:07
Moon phase
New Moon
Illumination
0%
+29°C
Weather archive — for 2019 year
Clear/Sunny
Weather archive — for 2019 year
Nighttime: +28°C
Precipitation: 0 mm
Wind: 3 — 4 m/s
Humidity: 70%
| Metric | Value | Metric | Value |
|---|---|---|---|
| Day temperature (max.) | +30°C | Sun hours | 12 h |
| UV index | 7 | Cloud cover (avg.) | 14% |
| Pressure (avg.) | 758 mmHg | Snow (total for the day) | 0 cm |
| Visibility (avg.) | 10 km | Sea temperature | — |
| Feels like (avg.) | +33°C | Dew point (avg.) | +23°C |
| Heat index (avg.) | +33°C | Wind chill (avg.) | +29°C |
| Wind gusts (max.) | 6 m/s | Wind direction (avg.) | 211° ↙ (WSW) |
Sunrise
06:12
Duration
12 h 24 min
Sunset
18:36
Moonrise
20:40
Moonset
08:09
Moon phase
Waning Gibbous
Illumination
78%
Weather in Samui on 18 August in previous years
| Year | Day | Nighttime | Average | Sun | UV | Humidity | Wind |
|---|---|---|---|---|---|---|---|
| 2025 |
+29°C
|
+28°C
|
+28°C | 10 h | 7 | 72% | 3 — 4 m/s |
| 2024 |
+30°C
|
+29°C
|
+29°C | 4 h | 6 | 72% | 2 — 2 m/s |
| 2023 |
+30°C
|
+28°C
|
+28°C | 9 h | 7 | 76% | 5 — 6 m/s |
| 2022 |
+31°C
|
+28°C
|
+29°C | 9 h | 6 | 72% | 4 — 6 m/s |
| 2021 |
+28°C
|
+24°C
|
+27°C | 11 h | 6 | 73% | 3 — 4 m/s |
| 2020 |
+29°C
|
+26°C
|
+28°C | 8 h | 7 | 74% | 3 — 4 m/s |
| 2019 |
+30°C
|
+28°C
|
+29°C | 12 h | 7 | 70% | 3 — 4 m/s |