Guam Weather Forecast
Guam weather: 86°F, thunderstorm. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
UV index in Guam
Use SPF 30+, a hat and sunglasses; seek shade near midday. Burn times are approximate, for unprotected skin at peak UV.
Health and safety today
| Skin and UV | Use SPF 30+, a hat and sunglasses; seek shade near midday. |
|---|---|
| Heat stress | The heat index is 94°F, higher than the air temperature because humidity is 70%. Sweat evaporates slowly, so drink before you feel thirsty and take shade breaks. |
| Pets | Pavement can be 20°C hotter than the air. Walk dogs early or late, never leave animals in cars, and carry water. |
| Older adults | Heat builds up slowly indoors. Check on anyone over 65 living alone and keep rooms ventilated. |
| Children | Small bodies overheat faster than adults. Shade, hats and frequent drinks; skip midday sport. |
Next 24 hours
Hour-by-hour temperature, precipitation chance and wind.
See the Guam forecast by time range
Guam weather - more answers
Explore Guam
Every topic we hold for this place, and the same topic for the places around it.
Weather for related places
Frequently asked questions
Where is Guam?
Guam is a country in Oceania. Its coordinates are 13.4443, 144.7937. It lies in Oceania.
What is the weather like in Guam right now?
It is currently 86°F (30°C) with thunderstorm. Humidity is 70% and wind is 10 mph.
When is the best time to visit Guam?
January, February and December offer the most comfortable conditions in Guam, which has a tropical climate. July, August and September are usually the hardest months for outdoor plans.
What time zone is Guam in?
Guam observes Pacific/Guam (UTC+10:00). The local time is 6:10 AM.
How many people live in Guam?
Guam has a population of approximately 170.000.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (countries-v1) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 25, 2026 at 6:10 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
