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When is the best time to visit Guam?
In general the best time to visit Guam is probably June, when the weather is usually great. The hottest months are June, November, December, while the coldest months are January, February, March.
The best time to visit may differ depending on what you are looking for:
- The best time for a sunbathing holiday is June, November, December. Average maximum temperatures are up to +30°C in June and it has 1 sunny days on average.
- In general, it’s pleasant to walk and do outdoor activities during January - December.
- If you want to avoid wet weather, then your choice is August, September, October with the lowest chance of rain.
Average weather in Guam in different months
This is the average weather in Guam for each month based on historic data:
In January, February, March, April, May, June, July, August, September, October, November, December the weather is average. Expect around 319 rainy days, and the precipitation amounts to approximately 457 mm in August.
Climate in Guam
Here is the detailed breakdown of the climate in Guam for each month:
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum Temperature | |||||||||||
| +32°C | +31°C | +32°C | +34°C | +34°C | +33°C | +33°C | +33°C | +34°C | +33°C | +33°C | +32°C |
| Average Maximum Temperature | |||||||||||
| +28°C | +28°C | +28°C | +29°C | +29°C | +30°C | +29°C | +29°C | +29°C | +29°C | +29°C | +29°C |
| Minimum Temperature | |||||||||||
| +22°C | +22°C | +21°C | +23°C | +23°C | +23°C | +23°C | +23°C | +23°C | +22°C | +23°C | +23°C |
| Avg. water temperature | |||||||||||
| - | - | - | - | - | - | - | - | - | - | - | - |
| Humidity, % | |||||||||||
| 79 | 78 | 78 | 79 | 79 | 80 | 82 | 84 | 84 | 84 | 82 | 81 |
| Rain, mm | |||||||||||
| 121 | 91 | 70 | 101 | 132 | 209 | 351 | 457 | 403 | 385 | 238 | 151 |
| Snow, mm | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Average wind speed, m/s | |||||||||||
| 5 | 5 | 5 | 5 | 4 | 4 | 3 | 3 | 2 | 3 | 4 | 5 |
| Sunny Days | |||||||||||
| 2 | 2 | 2 | 2 | 2 | 1 | 0 | 0 | 0 | 0 | 1 | 1 |
| Cloud Days | |||||||||||
| 4 | 5 | 5 | 3 | 3 | 1 | 0 | 0 | 0 | 1 | 1 | 2 |
| Rainy Days | |||||||||||
| 25 | 22 | 24 | 24 | 26 | 27 | 29 | 29 | 28 | 29 | 28 | 28 |
| Snowy Days | |||||||||||
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Average Temperature
Here are the average maximum and minimum temperatures in Guam during the whole year:
The hottest month in Guam is June with average maximum temperature going up to +30°C. The coldest month is January with the lowest temperatures of +25°C.
Humidity
The temperature feels different depending on humidity. Here is how humidity in Guam looks throughout the year, in %:
The most humid month in Guam is October with average humidity going up to 84%. The least humid month is February with an average humidity of 78%.
Rain
Amount of rainfall in mm. in Guam during the whole year based on historical data:
The sunniest and driest month is March with approximately 2 sunny days and a total precipitation of around 70 mm. The rainiest and wettest month is August with approximately 29 rainy days and 457 mm of total precipitation.
FAQ
Frequently asked questions about the weather in Guam:
What is the hottest month in Guam?
The hottest month in Guam is June with average maximum temperature of +30°C.
What is the coldest month in Guam?
The coldest month in Guam is January with minimum temperatures of +25°C.
Is Guam worth visiting in winter?
Winter in Guam could be a good time to visit, as the weather is generally ok.
When does it rain the least in Guam?
if you're looking to visit Guam when it rains the least, you should plan your trip for August, September, October. During this time, rainfall is rare with the driest month being March with only 70 mm of rain.
Monthly weather in Guam
Source of the data
For this page, we’ve looked at the typical weather in Guam, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
