Current Sea Water Temperature:
+89.8°F
| Maximum Sea Water Temperature in July: | 91.8°F |
| Minimum Sea Water Temperature in July: | 86.4°F |
| Average water temperature in July: | 89.2°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| July 27 | 89.8°F | July 22 | 88.6°F |
| July 26 | 89.8°F | July 21 | 88.6°F |
| July 25 | 89.2°F | July 20 | 88.2°F |
| July 24 | 88.8°F | July 19 | 87.6°F |
| July 23 | 88.6°F | July 18 | 87.6°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 August, September and July.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Guam was 88.8°F. The maximum and minimum values were 87.8°F and 89.8°F respectively.
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 July
The average sea surface temperature in July 2026 for Guam was 88.4°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: 20:30
27 jul, monday
| 2100 |  |
86°F | W 9 mph |
28 jul, tuesday
| 0000 | |
86°F | W 7 mph |
| 0300 | |
84°F | W 7 mph |
| 0600 |  |
84°F | SW 6 mph |
| 0900 |  |
86°F | SW 6 mph |
| 1200 | |
90°F | SW 6 mph |
| 1500 |  |
90°F | SW 7 mph |
| 1800 |  |
88°F | W 7 mph |