Saipan climate

Name: Saipan
Address: MP

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
January	26.3 °C	24.2 °C	25.1 °C	28.8 °C	21.9 °C	29
February	26.1 °C	23.8 °C	24.9 °C	28.7 °C	21.3 °C	25
March	26.6 °C	24.1 °C	25.2 °C	28.9 °C	20.6 °C	30
April	27.2 °C	24.6 °C	25.8 °C	29.2 °C	22.7 °C	30
May	27.8 °C	25.1 °C	26.4 °C	30.2 °C	23.1 °C	31
June	28.0 °C	25.3 °C	26.7 °C	30.7 °C	23.3 °C	30
July	27.5 °C	24.9 °C	26.2 °C	30.8 °C	23.3 °C	31
August	27.3 °C	24.8 °C	26.1 °C	30.0 °C	23.5 °C	31
September	27.3 °C	24.8 °C	26.0 °C	29.4 °C	22.8 °C	30
October	27.2 °C	24.9 °C	26.0 °C	29.3 °C	23.3 °C	31
November	27.3 °C	25.1 °C	26.1 °C	29.1 °C	22.5 °C	30
December	26.9 °C	24.8 °C	25.8 °C	28.9 °C	22.6 °C	31

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
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

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.