Climate averages 1991–2020
Roseau weather
in August.
A hot, wet month: the 2nd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Roseau: daytime highs average 28.2°C and nights cool to about 26.0°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 99 mm of rain on roughly 18 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 38 min on an average August day.
The nearest other city in this atlas is Fort-de-France (85 km away). In August its highs average 28.9°C, 0.7°C warmer than Roseau, with 133 mm of rain.
From August to September, average highs rise by 0.1°C to 28.3°C, and monthly rainfall rises from 99 mm to 113 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Roseau climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.9°C24.2°C | 24.2°C | 31 | 12.0 | 11.311 h |
| February | 25.9°C24.0°C | 24.0°C | 19 | 7.0 | 11.612 h |
| March | 26.3°C24.2°C | 24.2°C | 19 | 6.9 | 12.012 h |
| April | 27.0°C24.7°C | 24.7°C | 29 | 8.3 | 12.512 h |
| May | 27.7°C25.5°C | 25.5°C | 44 | 10.2 | 12.813 h |
| June | 27.9°C25.9°C | 25.9°C | 47 | 10.5 | 13.013 h |
| July | 28.0°C25.8°C | 25.8°C | 76 | 16.4 | 12.913 h |
| August, selected | 28.2°C26.0°C | 26.0°C | 99 | 18.4 | 12.613 h |
| September | 28.3°C26.2°C | 26.2°C | 113 | 17.1 | 12.212 h |
| October | 28.0°C25.9°C | 25.9°C | 118 | 19.1 | 11.812 h |
| November | 27.3°C25.4°C | 25.4°C | 101 | 17.1 | 11.411 h |
| December | 26.5°C24.8°C | 24.8°C | 48 | 14.3 | 11.211 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Fort-de-France in AugustMartinique · 85 kmHigh 28.9°C · Low 26.0°C · 133 mm rain
- Basse-Terre in AugustGuadeloupe · 86 kmHigh 30.1°C · Low 26.6°C · 79 mm rain
- Castries in AugustSaint Lucia · 151 kmHigh 28.9°C · Low 25.0°C · 99 mm rain
- Saint John’s in AugustAntigua and Barbuda · 208 kmHigh 28.8°C · Low 26.3°C · 98 mm rain
- Kingstown in AugustSaint Vincent and the Grenadines · 239 kmHigh 28.5°C · Low 26.4°C · 141 mm rain
- Basseterre in AugustSaint Kitts and Nevis · 264 kmHigh 28.5°C · Low 26.3°C · 91 mm rain
- Bridgetown in AugustBarbados · 310 kmHigh 28.2°C · Low 26.0°C · 141 mm rain
- Saint George's in AugustGrenada · 363 kmHigh 28.0°C · Low 26.0°C · 156 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Roseau) is explained once on the Roseau year overview and on the Sources, method and limits page.