Climate averages 1991–2020
Basseterre weather
by month.
See how the year changes. August (tied with September) has the highest average daily maximum; March has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: FebruaryMarch
Long-term climate patterns, not a forecast for a particular trip.
Across the year Basseterre averages a daytime high of 27.3°C and a nighttime low of 25.2°C, with about 778 mm of rain on roughly 152 days. August (tied with September) is the warmest month (average high 28.5°C) and February the coolest (25.8°C). October is the wettest month with 125 mm; March is the driest with 20 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): February and March. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Basseterre
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
Basseterre climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.9°C24.1°C | 24.1°C | 30 | 10.3 | 11.211 h |
| February | 25.8°C23.9°C | 23.9°C | 21 | 7.4 | 11.612 h |
| March | 26.1°C24.0°C | 24.0°C | 20 | 6.8 | 12.012 h |
| April | 26.8°C24.5°C | 24.5°C | 33 | 8.5 | 12.513 h |
| May | 27.5°C25.4°C | 25.4°C | 61 | 11.9 | 12.913 h |
| June | 28.2°C26.0°C | 26.0°C | 47 | 10.9 | 13.113 h |
| July | 28.3°C26.1°C | 26.1°C | 74 | 14.5 | 13.113 h |
| August | 28.5°C26.3°C | 26.3°C | 91 | 17.0 | 12.713 h |
| September | 28.5°C26.3°C | 26.3°C | 118 | 17.6 | 12.212 h |
| October | 28.1°C26.0°C | 26.0°C | 125 | 17.8 | 11.812 h |
| November | 27.3°C25.4°C | 25.4°C | 105 | 15.8 | 11.311 h |
| December | 26.4°C24.7°C | 24.7°C | 54 | 13.2 | 11.111 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
Nearby cities
- Saint John’sAntigua and Barbuda · 96 kmHigh 27.6°C · Low 25.2°C · 817 mm rain a year
- Basse-TerreGuadeloupe · 179 kmHigh 28.9°C · Low 25.6°C · 679 mm rain a year
- RoseauDominica · 264 kmHigh 27.3°C · Low 25.2°C · 744 mm rain a year
- Fort-de-FranceMartinique · 347 kmHigh 28.1°C · Low 25.3°C · 984 mm rain a year
- CarolinaPuerto Rico · 363 kmHigh 29.6°C · Low 23.3°C · 949 mm rain a year
- CaguasPuerto Rico · 367 kmHigh 28.9°C · Low 23.3°C · 1,212 mm rain a year
- San JuanPuerto Rico · 381 kmHigh 29.9°C · Low 23.1°C · 949 mm rain a year
- BayamónPuerto Rico · 383 kmHigh 29.9°C · Low 23.2°C · 870 mm rain a year
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 limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-4, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at 17.30°, -62.80° (8 km from the city centre), adjusted up by 0.3°C for the difference between the city's elevation (12 m) and the cell's (60 m). Rain comes from the 0.25° cell at 17.25°, -62.75°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.