17.12
wed
wed
Day
82°F
W 19 mph
Precip.
100%
100%
Night
81°F
W 16 mph
Precip.
61%
61%
18.12
thu
thu
Day
82°F
W 18 mph
Precip.
100%
100%
Night
81°F
W 14 mph
Precip.
0%
0%
19.12
fri
fri
Day
82°F
SW 17 mph
Precip.
100%
100%
Night
81°F
W 16 mph
Precip.
100%
100%
20.12
sat
sat
Day
82°F
W 20 mph
Precip.
100%
100%
Night
81°F
W 18 mph
Precip.
73%
73%
21.12
sun
sun
Day
82°F
W 21 mph
Precip.
100%
100%
Night
81°F
W 19 mph
Precip.
40%
40%
22.12
mon
mon
Day
82°F
W 16 mph
Precip.
100%
100%
Night
81°F
W 12 mph
Precip.
100%
100%
23.12
tue
tue
Day
82°F
NW 7 mph
Precip.
100%
100%
Night
79°F
S 4 mph
Precip.
100%
100%
24.12
wed
wed
Day
82°F
W 7 mph
Precip.
0%
0%
Night
81°F
SW 7 mph
Precip.
76%
76%
25.12
thu
thu
Day
82°F
W 10 mph
Precip.
100%
100%
Night
81°F
W 7 mph
Precip.
100%
100%
26.12
fri
fri
Day
82°F
W 7 mph
Precip.
100%
100%
Night
81°F
NW 7 mph
Precip.
28%
28%
27.12
sat
sat
Day
82°F
NW 10 mph
Precip.
83%
83%
Night
81°F
W 9 mph
Precip.
0%
0%
28.12
sun
sun
Day
82°F
SW 13 mph
Precip.
29%
29%
Night
81°F
W 14 mph
Precip.
45%
45%
29.12
mon
mon
Day
82°F
W 14 mph
Precip.
100%
100%
Night
81°F
W 14 mph
Precip.
0%
0%
Sea water temperature in December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 83.8°F. The highest and lowest sea temperatures during the month were 84.0°F and 83.5°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: 00:07
December 17, wednesday
0300
81°F
SW
17 mph
17 mph
0600
81°F
SW
18 mph
18 mph
0900
82°F
W
19 mph
19 mph
1200
82°F
W
19 mph
19 mph
1500
82°F
W
17 mph
17 mph
1800
81°F
W
16 mph
16 mph
2100
81°F
W
16 mph
16 mph
December 18, thursday
0000
81°F
W
16 mph
16 mph
