Current sea water temperature:
+83.5°F
| Minimum sea water temperature in December: | 85.1°F |
| Maximum sea water temperature in December: | 81.9°F |
| Average sea water temperature in December: | 83.8°F |
| more information | |
14 days
forecast
forecast
| Guam |
monthly
weather
weather
| Guam |
Sea water temperature for the last 10 days:
| December 17 | 83.5°F | December 12 | 83.7°F |
| December 16 | 83.7°F | December 11 | 83.5°F |
| December 15 | 83.5°F | December 10 | 84.0°F |
| December 14 | 83.7°F | December 9 | 84.0°F |
| December 13 | 83.8°F | December 8 | 83.8°F |
Monthly sea water temperature, °F
When is the warmest sea in Guam?
Based on the data about daily sea water temperature for the last three years the warmest sea in Guam was noticed in August, September and July.
Monthly Sea Temperatures in Guam, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 85.0°F. The highest and lowest sea temperatures during the month were 85.8°F and 84.0°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 85.0°F. The highest and lowest sea temperatures during the month were 85.8°F and 84.0°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 84.7°F. The highest and lowest sea temperatures during the month were 85.5°F and 83.7°F.
current
weather
weather
| Guam |
weather in
December
December
| Guam |
Best time for vacation in Guam
Guam on a weather map
Places in Northern Mariana Islands:
Name
°F
24 Hours Forecast
Guam
Local time: 11:46
December 18, thursday
1200
84°F
W
17 mph
17 mph
1500
82°F
W
15 mph
15 mph
1800
82°F
W
16 mph
16 mph
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
