Guam Weather Forecast
Guam weather: 82°F, clear. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Will it rain in Guam?
Yes - rain is likely in Guam today.
A 66% chance means rain is expected over most of the area. Plan indoor alternatives.
Over the next 7 days, about 1,2 in of precipitation is forecast, with the wettest days falling on Wed, Thu, Fri, Sat, Sun, Mon and Tue.
The next 7 days look unusually dry - roughly 35% of a normal October week (1,2 in against 3,4 in).
16-day forecast for Guam
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Wed, Oct 21 | 🌦️ Drizzle | 92° / 78° | 66% · 0,1 in | 12 mph | 8 |
| Thu, Oct 22 | 🌦️ Light showers | 91° / 76° | 81% · 0,3 in | 16 mph | 8 |
| Fri, Oct 23 | 🌧️ Showers | 88° / 75° | 93% · 0,2 in | 13 mph | 8 |
| Sat, Oct 24 | 🌦️ Drizzle | 89° / 77° | 89% · 0,1 in | 12 mph | 8 |
| Sun, Oct 25 | 🌦️ Drizzle | 90° / 76° | 100% · 0,1 in | 11 mph | 8 |
| Mon, Oct 26 | ⛈️ Thunderstorm | 91° / 76° | 76% · 0,4 in | 13 mph | 8 |
| Tue, Oct 27 | ⛅ Partly cloudy | 92° / 77° | 76% | 9 mph | 8 |
| Wed, Oct 28 | 🌦️ Drizzle | 89° / 77° | 69% · 0,2 in | 5 mph | 8 |
| Thu, Oct 29 | ☁️ Overcast | 91° / 77° | 69% | 9 mph | 8 |
| Fri, Oct 30 | 🌦️ Light showers | 89° / 78° | 78% · 0,4 in | 10 mph | 8 |
| Sat, Oct 31 | 🌦️ Light drizzle | 88° / 77° | 71% · 0,0 in | 13 mph | 8 |
| Sun, Nov 1 | ⛈️ Thunderstorm | 86° / 79° | 67% · 0,2 in | 23 mph | 8 |
| Mon, Nov 2 | ⛈️ Thunderstorm | 87° / 75° | 82% · 0,3 in | 28 mph | 8 |
| Tue, Nov 3 | ⛈️ Thunderstorm | 90° / 75° | 78% · 0,2 in | 22 mph | 8 |
| Wed, Nov 4 | 🌦️ Light drizzle | 89° / 78° | 88% · 0,1 in | 13 mph | 8 |
| Thu, Nov 5 | 🌦️ Light drizzle | 86° / 78° | 42% · 0,0 in | 6 mph | 8 |
What this means for Guam
Today is slightly warmer than average for October. The forecast high of 92°F is 6.1°F above the 86°F typical for this month.
A 66% chance means rain is expected over most of the area. Plan indoor alternatives.
Wet roads are likely; braking distances roughly double in heavy rain.
Within 15 degrees of the equator, day length barely changes all year; seasons are defined by rain, not temperature.
Northern Hemisphere, so peak summer falls in June to August.
The gap between the warmest and coldest month averages 34°F - an unusually even climate through the year.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- A packable rain shell - 7 of the next 7 days carry a real chance of rain
- Insect repellent and quick-dry fabrics for humidity
- Avoid long hikes after mid-morning; start at dawn or leave it for a cooler day.
- If your dates are flexible, avoid July, August and September - historically the least comfortable months here.
See the Guam forecast by time range
Guam weather - more answers
Explore Guam
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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 82°F (28°C) with clear. Humidity is 78% and wind is 8 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 9:20 PM.
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 October 21, 2026 at 9:20 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
