Saipan climate
Saipan is warmest in June, with average highs of 28 °C, and coldest in February, when nights average 24 °C. August is the wettest month (324 mm) and March the driest (40 mm). Figures are 1991–2020 climate normals.
Across a full year Saipan averages 1,713 mm of rain and 359 days above 25 °C.
Northern Mariana Islands · 5 m elevation · population 48,220 · 1991–2020 normals
Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month
- Warmest month June 28 °C
- Coldest month February 24 °C
- Driest month March 40 mm
- Wettest month August 324 mm
- Least cloud April 44 % cloud
- Hottest on record July 31 °C
- Coldest on record March 21 °C
- Warmest sea September 30 °C
What to expectSaipan through the year
Saipan changes little through the year. Average daily highs stay between 26 and 28 °C, so no month stands out as a season in the way it would further from the equator.
Counted across a normal year, 359 days a year reach 25 °C, 0 of them reach 30 °C. The warmest reading in the 1991–2020 record is 31 °C, in July.
Rain is strongly seasonal. August averages 324 mm against 40 mm in March — 8.0 times as much. Planning around the dry months matters more here than planning around temperature.
The sea off Saipan is warmest in September at 30 °C and coldest in February at 27 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.
Month by month
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| January | 26.3 °C | 64 mm | 50 % |
| February | 26.1 °C | 44 mm | 48 % |
| March | 26.6 °C | 40 mm | 46 % |
| April | 27.2 °C | 56 mm | 44 % |
| May | 27.8 °C | 70 mm | 50 % |
| June | 28.0 °C | 106 mm | 57 % |
| July | 27.5 °C | 220 mm | 77 % |
| August | 27.3 °C | 324 mm | 85 % |
| September | 27.3 °C | 291 mm | 83 % |
| October | 27.2 °C | 297 mm | 69 % |
| November | 27.3 °C | 133 mm | 49 % |
| December | 26.9 °C | 69 mm | 44 % |
Temperature month by month
| Month | Avg high | Avg low | Mean | Record high | Record low | Days above 25 °C | Days above 30 °C | Days below 0 °C |
|---|---|---|---|---|---|---|---|---|
| January | 26.3 °C | 24.2 °C | 25.1 °C | 28.8 °C | 21.9 °C | 29 | 0 | 0 |
| February | 26.1 °C | 23.8 °C | 24.9 °C | 28.7 °C | 21.3 °C | 25 | 0 | 0 |
| March | 26.6 °C | 24.1 °C | 25.2 °C | 28.9 °C | 20.6 °C | 30 | 0 | 0 |
| April | 27.2 °C | 24.6 °C | 25.8 °C | 29.2 °C | 22.7 °C | 30 | 0 | 0 |
| May | 27.8 °C | 25.1 °C | 26.4 °C | 30.2 °C | 23.1 °C | 31 | 0 | 0 |
| June | 28.0 °C | 25.3 °C | 26.7 °C | 30.7 °C | 23.3 °C | 30 | 0 | 0 |
| July | 27.5 °C | 24.9 °C | 26.2 °C | 30.8 °C | 23.3 °C | 31 | 0 | 0 |
| August | 27.3 °C | 24.8 °C | 26.1 °C | 30.0 °C | 23.5 °C | 31 | 0 | 0 |
| September | 27.3 °C | 24.8 °C | 26.0 °C | 29.4 °C | 22.8 °C | 30 | 0 | 0 |
| October | 27.2 °C | 24.9 °C | 26.0 °C | 29.3 °C | 23.3 °C | 31 | 0 | 0 |
| November | 27.3 °C | 25.1 °C | 26.1 °C | 29.1 °C | 22.5 °C | 30 | 0 | 0 |
| December | 26.9 °C | 24.8 °C | 25.8 °C | 28.9 °C | 22.6 °C | 31 | 0 | 0 |
Rain, sun and wind month by month
| Month | Rainfall | Wet days | Daylight | Cloud cover | Humidity | Wind | Sea temp |
|---|---|---|---|---|---|---|---|
| January | 64 mm | 13 | 11 h/day | 50 % | 75 % | 33 km/h | 27.7 °C |
| February | 44 mm | 11 | 12 h/day | 48 % | 75 % | 33 km/h | 27.3 °C |
| March | 40 mm | 10 | 12 h/day | 46 % | 75 % | 31 km/h | 27.4 °C |
| April | 56 mm | 11 | 12 h/day | 44 % | 77 % | 29 km/h | 27.9 °C |
| May | 70 mm | 14 | 13 h/day | 50 % | 78 % | 26 km/h | 28.6 °C |
| June | 106 mm | 19 | 13 h/day | 57 % | 79 % | 25 km/h | 29.2 °C |
| July | 220 mm | 27 | 13 h/day | 77 % | 82 % | 24 km/h | 29.4 °C |
| August | 324 mm | 28 | 13 h/day | 85 % | 83 % | 25 km/h | 29.4 °C |
| September | 291 mm | 27 | 12 h/day | 83 % | 83 % | 25 km/h | 29.5 °C |
| October | 297 mm | 25 | 12 h/day | 69 % | 83 % | 28 km/h | 29.2 °C |
| November | 133 mm | 19 | 11 h/day | 49 % | 81 % | 32 km/h | 28.9 °C |
| December | 69 mm | 14 | 11 h/day | 44 % | 78 % | 33 km/h | 28.3 °C |
Planning a trip? See the best time to visit Saipan.
QuestionsCommon questions about Saipan’s climate
When is the best time to visit Saipan?
That depends on what you want, so the honest answer is a comparison rather than a single month. January, February, March sit closest to 20 °C on average, June is the warmest month and March the driest. The month-by-month table above has the full picture.
How hot does Saipan get?
In June, the warmest month, daily highs average 28 °C. About 0 days a year pass 30 °C. The highest value in the 1991–2020 record is 31 °C.
How cold does it get in winter?
Nights average 24 °C in February, the coldest month. Freezing nights are not part of a normal year here.
Which month is wettest in Saipan?
August, averaging 324 mm over 28 days with rain. The driest month is March with 40 mm. The year as a whole averages 1,713 mm.
Are these figures a forecast?
No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Saipan rather than what any particular week will bring. Individual years can differ substantially from the normal.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Data point
- 15.212°, 145.755° , 5 m above sea level (the coordinates the reanalysis values are taken for)
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.