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Saipan, Northern Mariana Islands climate
Am Tropical monsoon
Saipan has a remarkably steady tropical climate (Tropical monsoon, Köppen Am). The hottest month is June with an average daily high near 89°F, while the coldest is February averaging around 75°F at night. Precipitation totals about 74 inches a year and is strongly seasonal — August alone averages 13.1 inches while March barely receives 2.10 inches.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Saipan climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 86 | 87 | 88 | 89 | 88 | 88 | 87 | 87 | 87 | 86 |
| Avg temp (°F) | 80 | 80 | 81 | 82 | 83 | 84 | 83 | 83 | 83 | 82 | 82 | 82 |
| Avg low (°F) | 76 | 75 | 76 | 77 | 78 | 79 | 78 | 78 | 78 | 77 | 78 | 77 |
| Precipitation (in) | 3.6 | 2.9 | 2.1 | 3.2 | 2.9 | 4.6 | 7.8 | 13.1 | 11.3 | 12.4 | 6.2 | 4.4 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 85 | 85 | 86 | 87 | 88 | 89 |
| Avg temp (°F) | 80 | 80 | 81 | 82 | 83 | 84 |
| Avg low (°F) | 76 | 75 | 76 | 77 | 78 | 79 |
| Precipitation (in) | 3.6 | 2.9 | 2.1 | 3.2 | 2.9 | 4.6 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 88 | 87 | 87 | 87 | 86 |
| Avg temp (°F) | 83 | 83 | 83 | 82 | 82 | 82 |
| Avg low (°F) | 78 | 78 | 78 | 77 | 78 | 77 |
| Precipitation (in) | 7.8 | 13.1 | 11.3 | 12.4 | 6.2 | 4.4 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 14 | 18 | 16 | 20 | 24 | 25 | 24 | 23 | 19 | 18 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 16 | 15 | 14 | 18 | 16 | 20 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 24 | 25 | 24 | 23 | 19 | 18 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 54 | 46 | 39 | 40 | 47 | 68 | 78 | 77 | 64 | 45 | 46 |
| Relative humidity (%) | 77 | 77 | 77 | 78 | 79 | 80 | 82 | 82 | 82 | 82 | 80 | 78 |
| Wind speed (mph) | 14.5 | 14.6 | 13.9 | 13.0 | 11.4 | 11.2 | 10.2 | 10.1 | 9.9 | 11.7 | 14.1 | 14.9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 56 | 54 | 46 | 39 | 40 | 47 |
| Relative humidity (%) | 77 | 77 | 77 | 78 | 79 | 80 |
| Wind speed (mph) | 14.5 | 14.6 | 13.9 | 13.0 | 11.4 | 11.2 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 68 | 78 | 77 | 64 | 45 | 46 |
| Relative humidity (%) | 82 | 82 | 82 | 82 | 80 | 78 |
| Wind speed (mph) | 10.2 | 10.1 | 9.9 | 11.7 | 14.1 | 14.9 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 15 years of daily observations at Saipan Intl AP, a weather station, about 11 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.