Climate averages 1991–2020
Saipan weather
in September.
A warm, very wet month: the joint 6th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Saipan: daytime highs average 27.1°C and nights cool to about 24.8°C. By daytime temperature it is the joint 6th warmest of the 12 months.
Expect about 298 mm of rain on roughly 27 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Hagåtña (221 km away). In September its highs average 28.3°C, 1.2°C warmer than Saipan, with 314 mm of rain.
From September to October, average highs fall by 0.1°C to 27.1°C, and monthly rainfall rises from 298 mm to 304 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
Saipan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 26.2°C24.1°C | 24.1°C | 61 | 13.6 | 11.311 h |
| February | 26.0°C23.8°C | 23.8°C | 40 | 11.4 | 11.612 h |
| March | 26.5°C24.0°C | 24.0°C | 37 | 9.8 | 12.012 h |
| April | 27.1°C24.6°C | 24.6°C | 50 | 10.4 | 12.512 h |
| May | 27.7°C25.0°C | 25.0°C | 64 | 13.2 | 12.813 h |
| June | 27.9°C25.3°C | 25.3°C | 100 | 17.9 | 13.013 h |
| July | 27.4°C24.9°C | 24.9°C | 223 | 27.0 | 12.913 h |
| August | 27.2°C24.8°C | 24.8°C | 340 | 28.2 | 12.613 h |
| September, selected | 27.1°C24.8°C | 24.8°C | 298 | 26.6 | 12.212 h |
| October | 27.1°C24.8°C | 24.8°C | 304 | 25.6 | 11.812 h |
| November | 27.2°C25.0°C | 25.0°C | 133 | 19.0 | 11.411 h |
| December | 26.9°C24.8°C | 24.8°C | 67 | 14.8 | 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
September in nearby cities
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 Saipan) is explained once on the Saipan year overview and on the Sources, method and limits page.