Guam Weather Forecast
Guam weather: 76°F, heavy drizzle. 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 98% chance means rain is expected over most of the area. Plan indoor alternatives. Around 0,7 in is forecast, which is enough to soak trails and slow traffic.
Over the next 7 days, about 7,0 in of precipitation is forecast, with the wettest days falling on Thu, Fri, Sat, Sun, Mon, Tue and Wed.
The next 7 days carry about 2 times a normal week's rain for October (7,0 in against 3,4 in).
16-day forecast for Guam
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Thu, Oct 1 | ⛈️ Thunderstorm | 83° / 76° | 98% · 0,7 in | 20 mph | 8 |
| Fri, Oct 2 | ⛈️ Thunderstorm | 84° / 77° | 100% · 1,2 in | 28 mph | 3 |
| Sat, Oct 3 | ⛈️ Thunderstorm | 84° / 78° | 100% · 0,8 in | 30 mph | 6 |
| Sun, Oct 4 | ⛈️ Thunderstorm | 87° / 79° | 98% · 0,5 in | 28 mph | 7 |
| Mon, Oct 5 | 🌦️ Light showers | 87° / 77° | 94% · 0,8 in | 26 mph | 8 |
| Tue, Oct 6 | ⛈️ Thunderstorm | 88° / 78° | 93% · 0,9 in | 20 mph | 7 |
| Wed, Oct 7 | ⛈️ Thunderstorm | 79° / 77° | 94% · 2,1 in | 12 mph | 1 |
| Thu, Oct 8 | 🌦️ Drizzle | 82° / 77° | 94% · 0,2 in | 13 mph | 1 |
| Fri, Oct 9 | 🌦️ Light drizzle | 89° / 77° | 86% · 0,1 in | 12 mph | 7 |
| Sat, Oct 10 | 🌦️ Drizzle | 91° / 77° | 80% · 0,2 in | 6 mph | 7 |
| Sun, Oct 11 | 🌦️ Light drizzle | 90° / 78° | 84% · 0,1 in | 4 mph | 8 |
| Mon, Oct 12 | 🌦️ Light drizzle | 87° / 78° | 92% · 0,1 in | 9 mph | 8 |
| Tue, Oct 13 | 🌦️ Light drizzle | 88° / 79° | 86% · 0,1 in | 7 mph | 7 |
| Wed, Oct 14 | 🌦️ Light drizzle | 90° / 75° | 84% · 0,2 in | 5 mph | 6 |
| Thu, Oct 15 | 🌧️ Showers | 89° / 76° | 61% · 0,4 in | 13 mph | 1 |
| Fri, Oct 16 | ☀️ Clear sky | -- / -- | 61% | -- | — |
What this means for Guam
Today is slightly cooler than average for October. The forecast high of 83°F is 3.4°F below the 86°F typical for this month.
A 98% chance means rain is expected over most of the area. Plan indoor alternatives. Around 0,7 in is forecast, which is enough to soak trails and slow traffic.
Gusts to 35 mph will push high-sided vehicles on exposed roads and bridges. 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 exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 35 mph.
- 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 76°F (25°C) with heavy drizzle. Humidity is 95% 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 1:14 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 1, 2026 at 1:14 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
