31.08
mon
mon
Day
81°F
NW 7 mph
Precip.
12%
12%
Night
77°F
SW 9 mph
Precip.
23%
23%
01.09
tue
tue
Day
81°F
NW 8 mph
Precip.
7%
7%
Night
77°F
N 4 mph
Precip.
11%
11%
02.09
wed
wed
Day
81°F
N 11 mph
Precip.
8%
8%
Night
79°F
E 6 mph
Precip.
9%
9%
03.09
thu
thu
Day
82°F
N 13 mph
Precip.
34%
34%
Night
79°F
SE 4 mph
Precip.
27%
27%
04.09
fri
fri
Day
73°F
S 15 mph
Precip.
33%
33%
Night
72°F
S 12 mph
Precip.
59%
59%
05.09
sat
sat
Day
68°F
SW 17 mph
Precip.
85%
85%
Night
68°F
S 13 mph
Precip.
8%
8%
06.09
sun
sun
Day
75°F
SW 17 mph
Precip.
11%
11%
Night
70°F
S 13 mph
Precip.
18%
18%
Sea water temperature in August, °F
Show year:
2026
2025
2024
The average sea water temperature in August of 2026 was 81.2°F. The highest and lowest sea temperatures during the month were 82.0°F and 80.1°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.
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: 22:22
September 01, tuesday
0000
77°F
SW
9 mph
9 mph
0300
77°F
SW
8 mph
8 mph
0600
77°F
SW
7 mph
7 mph
0900
79°F
SW
7 mph
7 mph
1200
81°F
NW
8 mph
8 mph
1500
79°F
N
5 mph
5 mph
1800
79°F
N
6 mph
6 mph
2100
79°F
N
4 mph
4 mph
