Measurements:
°C
°F
CURRENT WEATHER
08:45
Guam
86°F
S 14 mph
Feels like: 96°F
Precip: 19%
World Resorts Northern Mariana Islands Guam Weather

7 Day Weather Forecast

09.09
wed
DAY
88°F
S 12 mph
precip
20%
NIGHT
84°F
SW 10 mph
precip
50%
09.10
thu
DAY
86°F
SW 6 mph
precip
41%
NIGHT
84°F
S 8 mph
precip
14%
09.11
fri
DAY
86°F
S 9 mph
precip
19%
NIGHT
84°F
SW 9 mph
precip
27%
09.12
sat
DAY
88°F
W 6 mph
precip
7%
NIGHT
84°F
W 6 mph
precip
48%
09.13
sun
DAY
88°F
W 11 mph
precip
7%
NIGHT
84°F
W 6 mph
precip
9%
09.14
mon
DAY
88°F
W 8 mph
precip
14%
NIGHT
84°F
W 6 mph
precip
10%
09.15
tue
DAY
88°F
W 8 mph
precip
7%
NIGHT
84°F
SW 4 mph
precip
14%

Guam Sea Water Temperature in September, °F

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Guam was 29.4°F. The maximum and minimum values were 28.9°F and 29.9°F respectively.

Guam on the Weather Map

Best Time to Visit Guam
The most sunny months:
July 5 days
September 5 days
May 4 days
The most warm months:
June 91.4 °F
July 91.2 °F
August 90.9 °F
Warmest sea temperature:
September 89.4 °F
August 89.4 °F
July 89.2 °F
The most cold months:
February 86.8 °F
January 87.5 °F
March 87.8 °F
The most rainy months:
October 15 days
September 14 days
July 13 days
The most windy months:
February 17 mph
December 17 mph
January 16 mph
more details