World Resorts Japan Hakone Weather

Hakone sea water temperature

Current sea water temperature:
+59.5°F
Minimum sea water temperature in February: 62.6°F
Maximum sea water temperature in February: 56.3°F
Average sea water temperature in February: 59.0°F

Sea water temperature for the last 10 days:

February 5 59.5°F January 31 58.5°F
February 4 59.2°F January 30 58.6°F
February 3 58.8°F January 29 58.5°F
February 2 58.8°F January 28 58.8°F
February 1 58.6°F January 27 58.1°F

When is the warmest sea in Hakone?

Based on the data about daily sea water temperature for the last three years the warmest sea in Hakone was noticed in August, September and July.

Monthly Sea Temperatures in Hakone, °F

Sea water temperature in August, °F

Show year:
2025
2024
2023

The average sea water temperature in August of 2025 was 80.9°F. The highest and lowest sea temperatures during the month were 82.8°F and 79.9°F.

Sea water temperature in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 79.4°F. The highest and lowest sea temperatures during the month were 81.9°F and 75.7°F.

Sea water temperature in July, °F

Show year:
2025
2024
2023

The average sea water temperature in July of 2025 was 80.0°F. The highest and lowest sea temperatures during the month were 82.4°F and 77.0°F.

Best time for vacation in Hakone

Sunniest months:
January 17 days
December 17 days
November 13 days
Warmest months:
August 87.1 °F
July 84.5 °F
September 81.3 °F
Warmest sea temp:
August 80.4 °F
September 78.5 °F
July 76.8 °F
Coldest months:
January 48.9 °F
February 49.7 °F
December 53.8 °F
Rainiest months:
July 8 days
August 7 days
April 7 days
Windiest months:
April 8.6 mph
March 8.5 mph
October 8.0 mph

Hakone on a weather map

Hakone
+48°F
SE 2 mph
Feels like: +48°F
Precip.: 0%
Places in Japan:
Name
°F
+45°F
+52°F
+52°F
+46°F
+50°F
+52°F
+48°F
+45°F
+61°F
+50°F
+28°F
+50°F
+52°F
+48°F
+45°F
24 Hours Forecast
Hakone
Local time: 21:24
February 06, friday
0000
46°F
E
4 mph
0300
43°F
SE
6 mph
0600
41°F
SE
4 mph
0900
48°F
E
2 mph
1200
54°F
NW
2 mph
1500
55°F
W
5 mph
1800
52°F
SW
6 mph
2100
48°F
SW
6 mph
Units of measurement: °C / °F