Climate averages 1991–2020
Belmopan weather
in September.
A hot, wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Belmopan: daytime highs average 30.5°C and nights cool to about 23.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 150 mm of rain on roughly 25 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 15 min on an average September day.
The nearest other city in this atlas is Chetumal (149 km away). In September its highs average 30.6°C, about as warm as Belmopan, with 186 mm of rain.
From September to October, average highs fall by 1.7°C to 28.8°C, and monthly rainfall rises from 150 mm to 169 mm.
The annual picture
September 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
Belmopan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.3°C19.6°C | 19.6°C | 68 | 14.6 | 11.211 h |
| February | 27.9°C20.3°C | 20.3°C | 38 | 10.7 | 11.612 h |
| March | 29.9°C21.2°C | 21.2°C | 38 | 9.5 | 12.012 h |
| April | 32.1°C22.9°C | 22.9°C | 39 | 8.4 | 12.513 h |
| May | 32.0°C23.8°C | 23.8°C | 95 | 16.1 | 12.913 h |
| June | 30.3°C24.0°C | 24.0°C | 162 | 24.8 | 13.113 h |
| July | 30.1°C23.6°C | 23.6°C | 126 | 24.0 | 13.113 h |
| August | 30.8°C23.7°C | 23.7°C | 126 | 23.7 | 12.713 h |
| September, selected | 30.5°C23.5°C | 23.5°C | 150 | 24.9 | 12.212 h |
| October | 28.8°C22.5°C | 22.5°C | 169 | 22.1 | 11.812 h |
| November | 27.2°C20.8°C | 20.8°C | 121 | 17.1 | 11.311 h |
| December | 26.5°C20.0°C | 20.0°C | 76 | 16.3 | 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
September in nearby cities
- Chetumal in SeptemberMexico · 149 kmHigh 30.6°C · Low 24.6°C · 186 mm rain
- Puerto Barrios in SeptemberGuatemala · 171 kmHigh 29.6°C · Low 24.0°C · 302 mm rain
- Puerto Cortez in SeptemberHonduras · 182 kmHigh 29.4°C · Low 24.4°C · 221 mm rain
- Choloma in SeptemberHonduras · 202 kmHigh 30.6°C · Low 24.0°C · 205 mm rain
- San Pedro Sula in SeptemberHonduras · 210 kmHigh 30.3°C · Low 23.2°C · 205 mm rain
- Panzos in SeptemberGuatemala · 227 kmHigh 29.9°C · Low 22.9°C · 277 mm rain
- El Progreso in SeptemberHonduras · 230 kmHigh 30.5°C · Low 23.1°C · 268 mm rain
- Cobán in SeptemberGuatemala · 262 kmHigh 23.7°C · Low 17.0°C · 417 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 Belmopan) is explained once on the Belmopan year overview and on the Sources, method and limits page.