Saipan climate
Saipan (Northern Mariana Islands) has a tropical savanna (dry winter) climate (Köppen Aw). The average temperature over the year is 28 °C82 °F, and about 1,408 mm55 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Saipan climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2882 | 2780 | 2781 | 652.6 |
| Feb | 2781 | 2780 | 2780 | 381.5 |
| Mar | 2781 | 2780 | 2781 | 321.3 |
| Apr | 2883 | 2781 | 2882 | 451.8 |
| May | 2984 | 2882 | 2883 | 471.9 |
| Jun | 2984 | 2883 | 2984 | 742.9 |
| Jul | 2984 | 2883 | 2984 | 1546.1 |
| Aug | 2984 | 2883 | 2983 | 30212 |
| Sep | 2984 | 2883 | 2883 | 26210 |
| Oct | 2984 | 2883 | 2883 | 2268.9 |
| Nov | 2984 | 2883 | 2983 | 1034.1 |
| Dec | 2883 | 2882 | 2882 | 592.3 |
| Year | 2984 | 2780 | 2882 | 1,40855 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 77% | 61% | 4.7 | 11:19 |
| Feb | 77% | 59% | 5.4 | 11:38 |
| Mar | 77% | 51% | 6.2 | 12:01 |
| Apr | 79% | 44% | 6.8 | 12:28 |
| May | 79% | 44% | 6.9 | 12:50 |
| Jun | 80% | 49% | 6.7 | 13:01 |
| Jul | 82% | 71% | 5.9 | 12:57 |
| Aug | 82% | 84% | 5.2 | 12:38 |
| Sep | 82% | 81% | 5.2 | 12:12 |
| Oct | 82% | 67% | 5.1 | 11:46 |
| Nov | 80% | 47% | 5.1 | 11:24 |
| Dec | 78% | 48% | 4.7 | 11:14 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Saipan is like
The warmest month is June, with an average high of 29 °C84 °F and a low of 28 °C83 °F. The coldest is February, when highs average 27 °C81 °F and lows 27 °C80 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 1.9 °C3.4 °F.
It is wet, with about 1,408 mm55 in of precipitation per year. The wettest three-month stretch is August–October, which brings 56% of the annual total. The wettest month is August (302 mm12 in), the driest is March (32 mm1.3 in).
Relative humidity ranges from 77% in March to 82% in August. The clearest skies (lowest average cloud amount, 44%) are typical of May. Average wind speed near the ground ranges from 16 km/h (10 mph) in September to 24 km/h (15 mph) in February. Daylight lasts from about 11.2 hours in December to 13.0 hours in June.
Best time to visit Saipan
Based on these averages, the most comfortable months for sightseeing and outdoor activities are December–May: average highs of 27 °C81 °F to 29 °C84 °F with 32 mm1.3 in to 65 mm2.6 in of precipitation per month.
The most challenging month is August, which is very wet (302 mm12 in) and humid (82% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Saipan
- Wetter months (July–October) — highs around 29 °C84 °F, lows around 28 °C83 °F, about 236 mm9.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (November–June) — highs 2781 to 29 °C84 °F, lows 2780 to 28 °C83 °F, about 58 mm2.3 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Saipan compares
Places in other countries with the most similar temperature and rainfall pattern: Hagåtña (Guam, Am), Saint Georges (Grenada, Aw) and Basse-Terre (Guadeloupe, Aw).
Nearby places
Frequently asked questions
What is the warmest month in Saipan?
June is the warmest month in Saipan, with an average high of 29 °C (84 °F) and an average low of 28 °C (83 °F).
What is the coldest month in Saipan?
February is the coldest month, with an average high of 27 °C (81 °F) and an average low of 27 °C (80 °F).
When does it rain the most in Saipan?
August is the wettest month with about 302 mm (11.9 in) of precipitation; March is the driest with about 32 mm (1.3 in).
What is the best time to visit Saipan?
Judging by long-term averages, the most comfortable months are December–May.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.