Climate averages 1991–2020
Port-au-Prince weather
in September.
A hot, very wet month: the 4th warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Port-au-Prince: daytime highs average 32.1°C and nights cool to about 24.5°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 223 mm of rain on roughly 25 days, which makes September a very wet month (the 11th 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 Cité Soleil (4 km away). In September its highs average 32.3°C, about as warm as Port-au-Prince, with 223 mm of rain.
Among the 18 cities listed in Haiti, Port-au-Prince ranks joint 3rd of 18 for the warmest September highs and joint 15th of 18 for the driest September (rainfall, lowest first). The mean September high of those 18 cities is 31.0°C; Port-au-Prince is 1.1°C warmer than that mean.
From September to October, average highs fall by 1.1°C to 31.0°C, and monthly rainfall falls from 223 mm to 208 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
Port-au-Prince climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.1°C20.6°C | 20.6°C | 25 | 6.5 | 11.111 h |
| February | 30.7°C21.0°C | 21.0°C | 42 | 8.3 | 11.512 h |
| March | 30.9°C21.7°C | 21.7°C | 103 | 15.3 | 12.012 h |
| April | 31.1°C22.8°C | 22.8°C | 169 | 20.3 | 12.613 h |
| May | 31.2°C23.8°C | 23.8°C | 240 | 24.0 | 13.013 h |
| June | 32.5°C24.7°C | 24.7°C | 142 | 20.1 | 13.213 h |
| July | 33.5°C24.9°C | 24.9°C | 130 | 20.3 | 13.113 h |
| August | 33.4°C25.0°C | 25.0°C | 193 | 23.4 | 12.813 h |
| September, selected | 32.1°C24.5°C | 24.5°C | 223 | 25.4 | 12.312 h |
| October | 31.0°C23.8°C | 23.8°C | 208 | 24.2 | 11.712 h |
| November | 30.2°C22.3°C | 22.3°C | 101 | 15.8 | 11.311 h |
| December | 30.1°C21.0°C | 21.0°C | 36 | 7.2 | 11.011 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
- Cité Soleil in SeptemberHaiti · 4 kmHigh 32.3°C · Low 25.0°C · 223 mm rain
- Carrefour in SeptemberHaiti · 7 kmHigh 30.9°C · Low 24.7°C · 180 mm rain
- Pétionville in SeptemberHaiti · 7 kmHigh 29.7°C · Low 22.7°C · 223 mm rain
- Croix-des-Bouquets in SeptemberHaiti · 12 kmHigh 32.1°C · Low 25.0°C · 223 mm rain
- Arcahaie in SeptemberHaiti · 31 kmHigh 31.1°C · Low 24.7°C · 43 mm rain
- Léogâne in SeptemberHaiti · 31 kmHigh 30.8°C · Low 24.8°C · 121 mm rain
- Jacmel in SeptemberHaiti · 40 kmHigh 29.4°C · Low 25.1°C · 137 mm rain
- Tigwav in SeptemberHaiti · 57 kmHigh 31.4°C · Low 26.3°C · 121 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 Port-au-Prince) is explained once on the Port-au-Prince year overview and on the Sources, method and limits page.
Pétionville, Cité Soleil and Croix-des-Bouquets lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.