Saipan weather in September

September is one of the least pleasant months in Saipan: highs of 29°C (84°F) and about 262 mm (10.3 in) of rain on average. Nights average 28°C (83°F) and cloud cover 81% (NASA POWER, 2001–2025 averages). The sea averages 30°C (86°F). It is the 2nd wettest month of the year and the 4th warmest. Compared with August, it is about as warm and about as wet; October brings highs of 29°C (84°F) and 226 mm (8.9 in) of rain.

Is September a good time to visit Saipan?

least pleasant month Weather score 40/100.

September is one of the least pleasant months for weather in Saipan. For better conditions, consider Nov–Jun.

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Does it rain a lot in Saipan in September?

Yes, it is one of the rainy months: about 262 mm (10.3 in) falls in an average September. It is the 2nd wettest month of the year.

How warm is Saipan in September?

Days average 29°C (84°F) and nights 28°C (83°F).

Saipan weather by month

Month	High	Low	Rain	Cloud	Sea	Weather
January	28°C (82°F)	27°C (80°F)	65 mm	61%	29°C (83°F)	best
February	27°C (81°F)	27°C (80°F)	38 mm	59%	28°C (82°F)	best
March	28°C (82°F)	27°C (80°F)	32 mm	51%	28°C (82°F)	best
April	28°C (83°F)	27°C (81°F)	45 mm	44%	28°C (83°F)	best
May	29°C (84°F)	28°C (82°F)	47 mm	44%	29°C (84°F)	best
June	29°C (84°F)	28°C (83°F)	74 mm	49%	30°C (85°F)	best
July	29°C (84°F)	28°C (83°F)	154 mm	71%	30°C (86°F)	fair
August	29°C (84°F)	28°C (83°F)	302 mm	84%	30°C (86°F)	least pleasant
September	29°C (84°F)	28°C (83°F)	262 mm	81%	30°C (86°F)	least pleasant
October	29°C (84°F)	28°C (83°F)	226 mm	67%	30°C (85°F)	fair
November	29°C (84°F)	28°C (83°F)	103 mm	47%	29°C (85°F)	best
December	28°C (83°F)	28°C (82°F)	59 mm	48%	29°C (84°F)	best

Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated Oct 31, 2026. How we rate months