Current sea water temperature:
+78.1°F
| Minimum sea water temperature in May: | 79.0°F |
| Maximum sea water temperature in May: | 75.0°F |
| Average sea water temperature in May: | 77.4°F |
| more information | |
14 days
forecast
forecast
| Hilo |
monthly
weather
weather
| Hilo |
Sea water temperature for the last 10 days:
| May 19 | 78.1°F | May 14 | 78.6°F |
| May 18 | 77.9°F | May 13 | 78.6°F |
| May 17 | 78.3°F | May 12 | 78.6°F |
| May 16 | 78.6°F | May 11 | 78.3°F |
| May 15 | 78.6°F | May 10 | 78.1°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
May
May
| Hilo |
Best time for vacation in Hilo
Hilo on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Hilo
Local time: 03:38
May 19, tuesday
0600
72°F
W
2 mph
2 mph
0900
73°F
W
8 mph
8 mph
1200
75°F
SW
7 mph
7 mph
1500
75°F
SW
10 mph
10 mph
1800
73°F
SW
9 mph
9 mph
2100
73°F
SW
6 mph
6 mph
May 20, wednesday
0000
72°F
SW
4 mph
4 mph
0300
72°F
SW
2 mph
2 mph
