Climate averages 1991–2020
Apia weather
in September.
A hot, wet month: the 9th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Apia: daytime highs average 28.9°C and nights cool to about 25.0°C. By daytime temperature it is the 9th warmest of the 12 months.
Expect about 160 mm of rain on roughly 22 days, which makes September a wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 01 min on an average September day.
From September to October, average highs rise by 0.2°C to 29.1°C, and monthly rainfall rises from 160 mm to 226 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
Apia climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.5°C25.5°C | 25.5°C | 360 | 27.8 | 12.813 h |
| February | 29.5°C25.5°C | 25.5°C | 328 | 24.8 | 12.613 h |
| March | 29.7°C25.5°C | 25.5°C | 271 | 27.3 | 12.212 h |
| April | 29.7°C25.6°C | 25.6°C | 218 | 25.5 | 11.812 h |
| May | 29.1°C25.5°C | 25.5°C | 207 | 24.4 | 11.511 h |
| June | 28.6°C25.4°C | 25.4°C | 143 | 21.9 | 11.311 h |
| July | 28.3°C25.0°C | 25.0°C | 138 | 21.0 | 11.411 h |
| August | 28.5°C24.9°C | 24.9°C | 121 | 21.0 | 11.712 h |
| September, selected | 28.9°C25.0°C | 25.0°C | 160 | 21.9 | 12.012 h |
| October | 29.1°C25.1°C | 25.1°C | 226 | 25.0 | 12.412 h |
| November | 29.3°C25.3°C | 25.3°C | 271 | 25.8 | 12.713 h |
| December | 29.4°C25.4°C | 25.4°C | 346 | 27.4 | 12.913 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.
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 Apia) is explained once on the Apia year overview and on the Sources, method and limits page.