The highest day temperature in September 2026 was 88°F. The lowest night temperature was 68°F. The average values for day and night temperatures during September were 77.1°F и 75.1°F respectivly.

The average sea surface temperature in September 2026 for Hakone was 81.4°F. The maximum and minimum values were 79.4°F and 83.6°F respectively.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Hakone is 5.6 in. It makes september one of the most rainy months of the year.

The average wind speed in September is 7.9 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Hakone in September is 6.4 hours.