September weather forecastKoshigoe, Japan
September
Weather in September
September, the first month of the autumn in Koshigoe, is still a warm month, with an average temperature fluctuating between 21.7°C (71.1°F) and 26.2°C (79.2°F).Temperature
Koshigoe observes a small decrease in the average high-temperature with the arrival of September, falling from August's moderately hot 29.8°C (85.6°F) to a still warm 26.2°C (79.2°F). Koshigoe marks an average drop to an agreeable 21.7°C (71.1°F) during nighttime in September, following the high of the day.Humidity
In September, the average relative humidity is 75%.Rainfall
In Koshigoe, during September, the rain falls for 11.1 days and regularly aggregates up to 36mm (1.42") of precipitation. In Koshigoe, during the entire year, the rain falls for 129.4 days and collects up to 351mm (13.82") of precipitation.Snowfall
In Koshigoe, snow does not fall in April through December.Daylight
The average length of the day in September is 12h and 25min.On the first day of September, sunrise is at 05:14 and sunset at 18:09. On the last day of the month, sunrise is at 05:36 and sunset at 17:27 JST.
Sunshine
The average sunshine in September is 8.2h.UV index
In Koshigoe, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: In September, a daily maximum UV index of 5 leads to the following instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Koshigoe, Japan
- Average high temperature in September: 26.2°C
The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is January (9.3°C).
- Average low temperature in September: 21.7°C
The month with the highest average low temperature is August (25.2°C).
The coldest month (with the lowest average low temperature) is January (3.9°C).
Average pressure in September
Koshigoe, Japan
- Average pressure in September: 1013.3mbar
The month with the highest atmospheric pressure is November (1018mbar).
The month with the lowest atmospheric pressure is June (1009.1mbar).
Average wind speed in September
Koshigoe, Japan
- Average wind speed in September: 14.7km/h
The windiest month (with the highest average wind speed) is March (17.4km/h).
The calmest month (with the lowest average wind speed) is June (13.9km/h).
Average humidity in September
Koshigoe, Japan
- Average humidity in September: 75%
The month with the highest relative humidity is July (79%).
The month with the lowest relative humidity is January (60%).
Average rainfall in September
Koshigoe, Japan
- Average rainfall in September: 36mm
The wettest month (with the highest rainfall) is July (51mm).
The driest month (with the least rainfall) is February (12mm).
Average rainfall days in September
Koshigoe, Japan
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is December (6.1 days).
Average snowfall in September
Koshigoe, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (3mm).
The months with the least snowfall are April, May, June, July, August, September, October, November and December (0mm).
Average snowfall days in September
Koshigoe, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Koshigoe, 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: 8h and 12min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 5h and 42min).
Average sunshine days in September
Koshigoe, Japan
- Average sunshine days in September: 15.5 days
The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is July (10.8 days).
Average UV index in September
Koshigoe, Japan
- Average UV index in September: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in September
Koshigoe, Japan
- Average cloud cover in September: 38
The months with the most cloud cover are March and October (Cloud cover 43).
The months with the least cloud cover are January and December (Cloud cover 29).
Average visibility in September
Koshigoe, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
