Current sea water temperature:
+78.1°F
| Minimum sea water temperature in December: | 79.5°F |
| Maximum sea water temperature in December: | 75.0°F |
| Average sea water temperature in December: | 77.5°F |
| more information | |
14 days
forecast
forecast
| Hilo |
monthly
weather
weather
| Hilo |
Sea water temperature for the last 10 days:
| December 24 | 78.1°F | December 19 | 77.5°F |
| December 23 | 78.1°F | December 18 | 77.7°F |
| December 22 | 78.1°F | December 17 | 77.7°F |
| December 21 | 77.9°F | December 16 | 77.7°F |
| December 20 | 77.7°F | December 15 | 77.7°F |
Monthly sea water temperature, °F
When is the warmest sea in Hilo?
Based on the data about daily sea water temperature for the last three years the warmest sea in Hilo was noticed in September, October and August.
Monthly Sea Temperatures in Hilo, °F
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 80.4°F. The highest and lowest sea temperatures during the month were 80.8°F and 80.1°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 80.3°F. The highest and lowest sea temperatures during the month were 80.8°F and 79.7°F.
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 79.9°F. The highest and lowest sea temperatures during the month were 80.6°F and 79.2°F.
current
weather
weather
| Hilo |
weather in
December
December
| Hilo |
Best time for vacation in Hilo
Hilo on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Hilo
Local time: 00:21
December 24, wednesday
0300
68°F
SW
7 mph
7 mph
0600
68°F
SW
5 mph
5 mph
0900
70°F
SW
6 mph
6 mph
1200
70°F
SW
10 mph
10 mph
1500
70°F
SW
8 mph
8 mph
1800
70°F
SW
6 mph
6 mph
2100
68°F
SW
4 mph
4 mph
December 25, thursday
0000
66°F
W
1 mph
1 mph
