Current Sea Water Temperature:
+89.4°F
| Maximum Sea Water Temperature in September: | 91.6°F |
| Minimum Sea Water Temperature in September: | 87.0°F |
| Average water temperature in September: | 89.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| September 08 | 89.4°F | September 03 | 89.2°F |
| September 07 | 89.0°F | September 02 | 89.2°F |
| September 06 | 89.2°F | September 01 | 88.8°F |
| September 05 | 88.8°F | August 31 | 89.4°F |
| September 04 | 89.0°F | August 30 | 89.4°F |
When is the Warmest Sea for Guam?
According to our data for the last three years for Guam the highest average sea water temperature was in September, August and July.
Average Water Temperature by Month, °F
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Guam was 88.9°F. The maximum and minimum values were 87.8°F and 89.8°F respectively.
Sea Water Temperature in August
The average sea surface temperature in August 2026 for Guam was 88.6°F. The maximum and minimum values were 87.8°F and 89.8°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Guam was 88.5°F. The maximum and minimum values were 86.8°F and 89.8°F respectively.
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Guam
Local time: 05:45
09 sep, wednesday
| 0600 |  |
84°F | S 13 mph |
| 0900 |  |
86°F | S 13 mph |
| 1200 | |
88°F | SW 11 mph |
| 1500 | |
88°F | SW 9 mph |
| 1800 | |
86°F | SW 10 mph |
| 2100 |  |
84°F | S 9 mph |
10 sep, thursday
| 0000 | |
84°F | SW 7 mph |
| 0300 | |
84°F | SW 7 mph |