| < September >
|Normal Max/ High Temperature
|Min/ Low Temperature
|Average Daylight per day
|Sun altitude at solar noon on the 21st day.
- The average temperature in Karuizawa in September is very mild at 15.7 °C (60.26 °F).
- Afternoons can be warm with average high temperatures reaching 20.5 °C (68.9 °F).
- Overnight temperatures are generally quite mild with an average low of 12.2 °C (54 °F).
- In September there is a variation/ range of mean diurnal temperatures of 8.3 °C (14.9 °F).
- The weather in September is very slightly soggy. Around 173.3mm (6.8in) of fluid is laid.
- The shortest day is 11:48 long and the longest day is 12:56 long with an average length of 12:22.
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Weather Trend Graph for September in Karuizawa, Japan
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