Hagåtña climate
Hagåtña (Guam) has a tropical monsoon climate (Köppen Am). The average temperature over the year is 28 °C83 °F, and about 1,607 mm63 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Hagåtña climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2882 | 2781 | 2882 | 823.2 |
| Feb | 2882 | 2780 | 2781 | 512.0 |
| Mar | 2882 | 2780 | 2781 | 431.7 |
| Apr | 2883 | 2781 | 2882 | 471.8 |
| May | 2984 | 2882 | 2883 | 622.5 |
| Jun | 2984 | 2883 | 2984 | 973.8 |
| Jul | 2984 | 2883 | 2983 | 1977.8 |
| Aug | 2984 | 2882 | 2883 | 31512 |
| Sep | 2984 | 2882 | 2883 | 27811 |
| Oct | 2984 | 2883 | 2883 | 2319.1 |
| Nov | 2984 | 2883 | 2984 | 1355.3 |
| Dec | 2983 | 2882 | 2883 | 692.7 |
| Year | 2984 | 2780 | 2883 | 1,60763 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 78% | 64% | 4.8 | 11:25 |
| Feb | 78% | 61% | 5.5 | 11:41 |
| Mar | 78% | 57% | 6.2 | 12:01 |
| Apr | 79% | 49% | 6.7 | 12:25 |
| May | 80% | 52% | 6.6 | 12:45 |
| Jun | 80% | 56% | 6.4 | 12:55 |
| Jul | 82% | 77% | 5.6 | 12:51 |
| Aug | 82% | 86% | 5.1 | 12:34 |
| Sep | 82% | 85% | 5.0 | 12:11 |
| Oct | 82% | 73% | 5.0 | 11:48 |
| Nov | 80% | 55% | 5.0 | 11:29 |
| Dec | 79% | 55% | 4.8 | 11:20 |
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 Hagåtña 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 28 °C82 °F and lows 27 °C80 °F. Temperatures barely change through the year: the warmest and the coolest month differ by only 1.5 °C2.8 °F.
It is wet, with about 1,607 mm63 in of precipitation per year. The wettest three-month stretch is August–October, which brings 51% of the annual total. The wettest month is August (315 mm12 in), the driest is March (43 mm1.7 in).
Relative humidity ranges from 78% in March to 82% in August. The clearest skies (lowest average cloud amount, 49%) are typical of April. Average wind speed near the ground ranges from 14 km/h (9 mph) in September to 24 km/h (15 mph) in February. Daylight lasts from about 11.3 hours in December to 12.9 hours in June.
Best time to visit Hagåtña
Based on these averages, the most comfortable months for sightseeing and outdoor activities are December–May: average highs of 28 °C82 °F to 29 °C84 °F with 43 mm1.7 in to 82 mm3.2 in of precipitation per month.
The most challenging month is August, which is very wet (315 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 Hagåtña
- Wetter months (July–November) — highs around 29 °C84 °F, lows around 28 °C82 °F, about 231 mm9.1 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 (December–June) — highs 2882 to 29 °C84 °F, lows 2780 to 28 °C83 °F, about 64 mm2.5 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses.
How Hagåtña compares
Compared with Saipan, about 221 km to the northeast, Hagåtña has practically the same average temperature and receives 14% more precipitation (1,607 mm63 in vs 1,408 mm55 in).
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Saipan (Northern Mariana Islands, Aw), Lae (Papua New Guinea, Af) and Fort-de-France (Martinique, Am).
Nearby places
Frequently asked questions
What is the warmest month in Hagåtña?
June is the warmest month in Hagåtña, with an average high of 29 °C (84 °F) and an average low of 28 °C (83 °F).
What is the coldest month in Hagåtña?
February is the coldest month, with an average high of 28 °C (82 °F) and an average low of 27 °C (80 °F).
When does it rain the most in Hagåtña?
August is the wettest month with about 315 mm (12.4 in) of precipitation; March is the driest with about 43 mm (1.7 in).
What is the best time to visit Hagåtña?
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.