September weather forecastSanmu, Japan
September weather forecast for Sanmu, Japan: The first month of the autumn, September, is still a warm month in Sanmu, Japan, with an average temperature varying between 26.1°C (79°F) and 22°C (71.6°F). In Sanmu, in September, it is raining for 16.2 days, with typically 118mm (4.65") of accumulated precipitation.
September
Weather in September
The first month of the autumn, September, is still a warm month in Sanmu, Japan, with an average temperature varying between 26.1°C (79°F) and 22°C (71.6°F).Temperature
A mild shift in the average high-temperature occurs in September, reducing from 29.6°C (85.3°F) in August to a still moderately hot 26.1°C (79°F). September introduces a small decrease to a nighttime average of 22°C (71.6°F).Humidity
In Sanmu, the average relative humidity in September is 78%.Rainfall
In Sanmu, in September, it is raining for 16.2 days, with typically 118mm (4.65") of accumulated precipitation. In Sanmu, during the entire year, the rain falls for 173.1 days and collects up to 1019mm (40.12") of precipitation.Snowfall
In Sanmu, snow does not fall in March through December.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 05:10 and sunset at 18:06. On the last day of September, sunrise is at 05:32 and sunset at 17:24 JST.
Sunshine
In September, the average sunshine is 7.6h.UV index
In Sanmu, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In September, the maximum UV index of 6 translates into these guidelines:
Guard against overexposure. Protection from sun-induced harm is essential. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sanmu, Japan
- Average high temperature in September: 26.1°C
The warmest month (with the highest average high temperature) is August (29.6°C).
The month with the lowest average high temperature is January (9.5°C).
- Average low temperature in September: 22°C
The month with the highest average low temperature is August (25°C).
The coldest month (with the lowest average low temperature) is January (5°C).
Average pressure in September
Sanmu, Japan
- Average pressure in September: 1013.3mbar
The month with the highest atmospheric pressure is November (1017.8mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in September
Sanmu, Japan
- Average wind speed in September: 15.6km/h
The windiest month (with the highest average wind speed) is March (19.4km/h).
The calmest month (with the lowest average wind speed) is June (14.5km/h).
Average humidity in September
Sanmu, Japan
- Average humidity in September: 78%
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is January (61%).
Average rainfall in September
Sanmu, Japan
- Average rainfall in September: 118mm
The wettest month (with the highest rainfall) is October (132mm).
The driest month (with the least rainfall) is January (48mm).
Average rainfall days in September
Sanmu, Japan
- Average rainfall days in September: 16.2 days
The month with the highest number of rainy days is June (17.8 days).
The month with the least rainy days is January (8.3 days).
Average snowfall in September
Sanmu, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (12mm).
The months with the least snowfall are March, April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Sanmu, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.2 days).
The months with the least snowfall days are April, May, June, July, August, September, October, November and December (0 days).
Average daylight in September /
Average sunshine in September
Sanmu, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 7h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in September
Sanmu, Japan
- Average sunshine days in September: 10.9 days
The month with the most sunshine days is January (21.3 days).
The month with the least sunshine days is June (10 days).
Average UV index in September
Sanmu, Japan
- Average UV index in September: 6
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March and December (UV index 3).
Average cloud cover in September
Sanmu, Japan
- Average cloud cover in September: 41
The months with the most cloud cover are March, June and October (Cloud cover 47).
The months with the least cloud cover are January and August (Cloud cover 33).
Average visibility in September
Sanmu, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (10km).
The month with the lowest visibility is July (9km).
