Weather & climate · Hagatna
Best Time to Visit Guam
December to May
The best time to visit Guam is December to May, when daytime highs in Hagatna are around 28–29°C. June and November are also a good time to go. June is the warmest month (29°C by day), February the coldest (27°C at night), and August the wettest with about 315 mm of rain.
29°C
Warmest: June
27°C
Coldest nights: February
1607 mm
Rain per year
315 mm
Wettest: August
Guam weather by month
- Jan28°C27°C82 mm
- Feb28°C27°C51 mm
- Mar28°C27°C42 mm
- Apr28°C27°C47 mm
- May29°C28°C62 mm
- Jun29°C28°C97 mm
- Jul29°C28°C197 mm
- Aug29°C28°C315 mm
- Sep29°C28°C278 mm
- Oct29°C28°C231 mm
- Nov29°C28°C136 mm
- Dec29°C28°C69 mm
Best time Good Less ideal
| Month | High | Low | Rain | Humidity | Cloud cover | Verdict |
|---|---|---|---|---|---|---|
| January | 28°C | 27°C | 82 mm | 78% | 64% | Best time |
| February | 28°C | 27°C | 51 mm | 78% | 61% | Best time |
| March | 28°C | 27°C | 42 mm | 78% | 57% | Best time |
| April | 28°C | 27°C | 47 mm | 79% | 49% | Best time |
| May | 29°C | 28°C | 62 mm | 80% | 52% | Best time |
| June | 29°C | 28°C | 97 mm | 80% | 56% | Good |
| July | 29°C | 28°C | 197 mm | 82% | 77% | Rainy |
| August | 29°C | 28°C | 315 mm | 82% | 86% | Rainy |
| September | 29°C | 28°C | 278 mm | 82% | 85% | Rainy |
| October | 29°C | 28°C | 231 mm | 82% | 73% | Rainy |
| November | 29°C | 28°C | 136 mm | 80% | 55% | Good |
| December | 29°C | 28°C | 69 mm | 79% | 55% | Best time |
Data: NASA POWER (Prediction Of Worldwide Energy Resources) — 25-year climate averages 2001–2025, public domain, for the area around Hagatna (13.47, 144.73). Satellite and model averages — local weather stations can differ by 1–2 °C, and mountains or coasts elsewhere in Guam have their own climate.
Frequently asked questions
When is the best time to visit Guam?
December to May. The best time to visit Guam is December to May, when daytime highs in Hagatna are around 28–29°C. June and November are also a good time to go. June is the warmest month (29°C by day), February the coldest (27°C at night), and August the wettest with about 315 mm of rain.
What is the hottest month in Guam?
June, with average highs of 29°C in Hagatna.
What is the coldest month in Guam?
February, when nights drop to about 27°C and days reach 28°C.
What is the rainiest month in Guam?
August with about 315 mm; March is the driest (42 mm).
When should I avoid visiting Guam?
August is the least comfortable month on average: 29°C by day and 315 mm of rain.