Guam weather live forecast

Today's maximum temperature in Guam is expected to be 30°C. Select a day from the live weather forecast for Guam (Agana) for more weather parameters.

Monday
8th Dec
30

26

6

8
Tuesday
9th Dec
29

26

7

8
Wednesday
10th Dec
30

26

6

9
Thursday
11th Dec
30

26

7

9
Friday
12th Dec
30

27

7

7

5-day weather forecast updated at 04:00 on Monday 8th December 2025 GMT

More about Guam

Guam by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Guam

Marriott: Hotel deals & packages

Sale

Save on your next trip with deals & packages
Includes hotel, flight, cars & more packages
Discover Bangkok, Sydney, Toronto & beyond

Go to Marriott deal >>

View all Marriott offers

The 5-day weather forecast for Guam, represented by Agana, (Agana) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Guam weather forecast by day

Below are the detailed weather forecasts for Guam for the next 5 days. The forecasts shown are for Agana and may not represent the whole of Guam. Browse more destinations in Guam to view more weather forecasts.

Guam weather for Monday 8th December 2025

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 39% chance of some rain and a gentle breeze of 15 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
8
UV index (Very High)
39
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from E

Guam weather for Tuesday 9th December 2025

Expect isolated thunderstorms in Guam with a maximum temperature of 29°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 7 hours of bright sunshine. There are 2-5 mm of rainfall expected with 36% chance of some rain and a gentle breeze of 18 kph from the east.

29
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
8
UV index (Very High)
36
% chance of some rain
<5
mm of rainfall expected
M
moderate heat & humidity
18
kph wind from E

Guam weather for Wednesday 10th December 2025

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 43% chance of some rain and a gentle breeze of 19 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
9
UV index (Very High)
43
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
19
kph wind from E

Guam weather for Thursday 11th December 2025

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 9 (Very High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 39% chance of some rain and a moderate breeze of 21 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
7
hours of sunshine
9
UV index (Very High)
39
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
21
kph wind from E

Guam weather for Friday 12th December 2025

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 7 hours of bright sunshine. There are 0-2 mm of rainfall expected with 69% chance of some rain and a moderate breeze of 20 kph from the north-east.