Guam weather live forecast

Today's maximum temperature in Guam is expected to be 28°C. Select a day from the live weather forecast for Guam (Agana) for more weather parameters.

Wednesday
19th Aug
28

24

3

11
Thursday
20th Aug
30

26

5

7
Friday
21st Aug
30

26

7

11
Saturday
22nd Aug
30

26

4

10
Sunday
23rd Aug
30

26

5

7

5-day weather forecast updated at 04:00 on Wednesday 19th August 2026 GMT

More about Guam

Guam by month

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

Recommended for Guam

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 Wednesday 19th August 2026

Expect isolated thunderstorms in Guam with a maximum temperature of 28°C, moderate levels of heat & humidity, maximum UV of 11 (Extreme) and 3 hours of bright sunshine. There are 10-20 mm of rainfall expected with 72% chance of some rain and a gentle breeze of 19 kph from the north.

28
°C maximum temperature
24
°C minimum temperature
isolated thunderstorms
3
hours of sunshine
11
UV index (Extreme)
72
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
19
kph wind from N

Guam weather for Thursday 20th August 2026

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 5 hours of bright sunshine. There are 10-20 mm of rainfall expected with 58% chance of some rain and a gentle breeze of 15 kph from the east.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
5
hours of sunshine
7
UV index (High)
58
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
15
kph wind from E

Guam weather for Friday 21st August 2026

Expect broken clouds in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 11+ (Extreme) and 7 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 11 kph from the south-west.

30
°C maximum temperature
26
°C minimum temperature
broken clouds
7
hours of sunshine
11
UV index (Extreme)
0
mm of rainfall expected
M
moderate heat & humidity
11
kph wind from SW

Guam weather for Saturday 22nd August 2026

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 10 (Very High) and 4 hours of bright sunshine. There are 10-20 mm of rainfall expected with 74% chance of some rain and a moderate breeze of 20 kph from the south-west.

30
°C maximum temperature
26
°C minimum temperature
isolated thunderstorms
4
hours of sunshine
10
UV index (Very High)
74
% chance of some rain
<20
mm of rainfall expected
M
moderate heat & humidity
20
kph wind from SW

Guam weather for Sunday 23rd August 2026

Expect isolated thunderstorms in Guam with a maximum temperature of 30°C, moderate levels of heat & humidity, maximum UV of 7 (High) and 5 hours of bright sunshine. There are 20-30 mm of rainfall expected with 86% chance of some rain and a moderate breeze of 25 kph from the south-west.