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.

Thursday
18th Dec
30

27

8

9
Friday
19th Dec
29

26

7

8
Saturday
20th Dec
30

26

4

8
Sunday
21st Dec
30

26

5

8
Monday
22nd Dec
29

26

5

8

5-day weather forecast updated at 04:00 on Thursday 18th December 2025 GMT

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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 Thursday 18th 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 8 hours of bright sunshine. There are 0-2 mm of rainfall expected with 3% chance of some rain and a moderate breeze of 23 kph from the east.

30
°C maximum temperature
27
°C minimum temperature
isolated thunderstorms
8
hours of sunshine
9
UV index (Very High)
3
% chance of some rain
<2
mm of rainfall expected
M
moderate heat & humidity
23
kph wind from E

Guam weather for Friday 19th December 2025

Expect broken clouds 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 0 mm of rainfall expected and a gentle breeze of 19 kph from the east.

29
°C maximum temperature
26
°C minimum temperature
broken clouds
7
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
19
kph wind from E

Guam weather for Saturday 20th 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 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 82% chance of some rain and a moderate breeze of 26 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
8
UV index (Very High)
82
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
26
kph wind from E

Guam weather for Sunday 21st December 2025

Expect broken clouds in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 8 (Very High) and 5 hours of bright sunshine. There are 0 mm of rainfall expected and a moderate breeze of 28 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
broken clouds
5
hours of sunshine
8
UV index (Very High)
0
mm of rainfall expected
M
moderate heat & humidity
28
kph wind from E

Guam weather for Monday 22nd 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 5 hours of bright sunshine. There are 0-2 mm of rainfall expected with 68% chance of some rain and a moderate breeze of 23 kph from the east.