21.09
mon
mon
Day
73°F
S 20 mph
Precip.
89%
89%
Night
77°F
SE 17 mph
Precip.
52%
52%
22.09
tue
tue
Day
77°F
NE 1 mph
Precip.
46%
46%
Night
73°F
SW 11 mph
Precip.
60%
60%
23.09
wed
wed
Day
73°F
SW 11 mph
Precip.
16%
16%
Night
72°F
S 6 mph
Precip.
20%
20%
24.09
thu
thu
Day
75°F
NW 5 mph
Precip.
10%
10%
Night
73°F
S 6 mph
Precip.
22%
22%
25.09
fri
fri
Day
70°F
S 4 mph
Precip.
23%
23%
Night
72°F
E 7 mph
Precip.
24%
24%
26.09
sat
sat
Day
79°F
SW 6 mph
Precip.
17%
17%
Night
68°F
SW 12 mph
Precip.
39%
39%
27.09
sun
sun
Day
72°F
SW 9 mph
Precip.
18%
18%
Night
70°F
SW 5 mph
Precip.
18%
18%
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 78.6°F. The highest and lowest sea temperatures during the month were 80.2°F and 76.6°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 75.1°F. The highest and lowest sea temperatures during the month were 77.5°F and 72.7°F.
Air temperature in Hakone, °F
Precipitation total in Hakone, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Hakone
Hakone on a weather map
Places in Japan:
Name
°F
24 Hours Forecast
Hakone
Local time: 03:11
September 21, monday
0600
73°F
S
17 mph
17 mph
0900
73°F
S
17 mph
17 mph
1200
73°F
S
20 mph
20 mph
1500
73°F
S
22 mph
22 mph
1800
75°F
S
22 mph
22 mph
2100
73°F
S
29 mph
29 mph
September 22, tuesday
0000
77°F
SE
17 mph
17 mph
0300
77°F
E
4 mph
4 mph
