September weather forecastNagano, Japan
September
Weather in September
September in Nagano, Japan presents itself with relatively high rainfall and a decrease in temperatures. The month trots in a higher average rainfall of 129mm (5.08"), the highest in the latter half of the year. This increased rainfall brings about a freshness to the city while also ushering in the autumn season. Humidity levels remain consistent, and the receding heat permits people to enjoy their outdoor activities comfortably. The city's foliage begins to change colors, hinting at the beautiful hues the forthcoming autumn has in store.Temperature
With September's arrival, Nagano's weather changes as the average high-temperature falls from a tropical 31°C (87.8°F) in August to a warm 25.6°C (78.1°F). During September, Nagano observes a consistent average nighttime temperature of 16.9°C (62.4°F).Humidity
In September, the average relative humidity is 74%.Rainfall
In Nagano, Japan, during September, the rain falls for 11.7 days and regularly aggregates up to 129mm (5.08") of precipitation. Throughout the year, in Nagano, there are 129.8 rainfall days, and 933mm (36.73") of precipitation is accumulated.Snowfall
In Nagano, Japan, snow does not fall in May through October.Daylight
In Nagano, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 05:18 and sunset at 18:15. On the last day of September, sunrise is at 05:41 and sunset at 17:32 JST.
Sunshine
In Nagano, the average sunshine in September is 4.7h.Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nagano, Japan
- Average high temperature in September: 25.6°C
The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (3.5°C).
- Average low temperature in September: 16.9°C
The month with the highest average low temperature is August (21.3°C).
The coldest month (with the lowest average low temperature) is January (-4.1°C).
Average humidity in September
Nagano, Japan
- Average humidity in September: 74%
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is April (61%).
Average rainfall in September
Nagano, Japan
- Average rainfall in September: 129.4mm
The wettest month (with the highest rainfall) is July (134.4mm).
The driest month (with the least rainfall) is November (44.3mm).
Average rainfall days in September
Nagano, Japan
- Average rainfall days in September: 11.7 days
The month with the highest number of rainy days is July (13.1 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Nagano, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (980mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Nagano, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (22.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Nagano, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in September: 4h and 42min
The month with the most sunshine is May (Average sunshine: 6h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
