18.12
thu
thu
Day
84°F
W 17 mph
Precip.
0%
0%
Night
81°F
W 18 mph
Precip.
0%
0%
19.12
fri
fri
Day
84°F
W 14 mph
Precip.
89%
89%
Night
81°F
W 16 mph
Precip.
76%
76%
20.12
sat
sat
Day
82°F
W 19 mph
Precip.
100%
100%
Night
81°F
W 19 mph
Precip.
100%
100%
21.12
sun
sun
Day
82°F
W 22 mph
Precip.
100%
100%
Night
81°F
W 23 mph
Precip.
100%
100%
22.12
mon
mon
Day
82°F
W 21 mph
Precip.
100%
100%
Night
81°F
W 19 mph
Precip.
100%
100%
23.12
tue
tue
Day
82°F
W 16 mph
Precip.
100%
100%
Night
81°F
W 14 mph
Precip.
100%
100%
24.12
wed
wed
Day
82°F
NW 15 mph
Precip.
69%
69%
Night
81°F
NW 9 mph
Precip.
100%
100%
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 83.7°F. The highest and lowest sea temperatures during the month were 84.0°F and 83.5°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 83.4°F. The highest and lowest sea temperatures during the month were 83.8°F and 82.9°F.
Air temperature in Guam, °F
Precipitation total in Guam, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Guam
Guam on a weather map
Places in Northern Mariana Islands:
Name
°F
24 Hours Forecast
Guam
Local time: 19:26
December 18, thursday
2100
81°F
SW
17 mph
17 mph
December 19, friday
0000
81°F
W
18 mph
18 mph
0300
81°F
W
15 mph
15 mph
0600
82°F
W
14 mph
14 mph
0900
82°F
W
13 mph
13 mph
1200
84°F
W
14 mph
14 mph
1500
82°F
W
15 mph
15 mph
1800
82°F
W
15 mph
15 mph
