Roseau weather in August
August in Roseau: hot, rainy, with clean air — a great time to visit.
#11 of 12 months in Roseau · #313 of 604 destinations to visit in August · comfort 79/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Roseau climate normals — August
| Daytime high | 29°C / 83°F | 🥵 hot |
|---|---|---|
| Nighttime low | 27°C / 80°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 107 mm / 4.2 in | 🌧 rainy |
| Rainy days | 18 days | |
| Humidity | 83% | 💦 very humid |
| Dew point | 25°C / 76°F | |
| Sunshine | 11.3 h/day | |
| Daylight | 12.6 h | |
| Wind | 31 km/h / 19 mph | |
| Air quality (US AQI) | 45 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Roseau in August — FAQ
- Is August a good time to visit Roseau?
- August in Roseau: hot, rainy, with clean air — a great time to visit. It ranks #11 of 12 months for Roseau on SeasonMap's comfort score (79/100).
- What is the weather like in Roseau in August?
- In August, Roseau averages a daily high of 28.5°C and a low of 26.5°C, with about 106.6 mm of rain over roughly 18.2 rainy days.
- What is the air quality in Roseau in August?
- Roseau has a mean US Air Quality Index of about 45 in August.