September weather forecastIiyama, Japan
September weather forecast for Iiyama, Japan: September, the first month of the autumn in Iiyama, is still a pleasant month, with an average temperature fluctuating between 13.4°C (56.1°F) and 22.6°C (72.7°F). In Iiyama, in September, during 17.7 rainfall days, 70mm (2.76") of precipitation is typically accumulated.
September
Weather in September
September, the first month of the autumn in Iiyama, is still a pleasant month, with an average temperature fluctuating between 13.4°C (56.1°F) and 22.6°C (72.7°F).Temperature
A change in temperatures is noted as August gives way to September, with average highs reducing from a warm 27.8°C (82°F) to an agreeable 22.6°C (72.7°F). Nighttime temperatures hover around an average low of 13.4°C (56.1°F) in September.Humidity
The average relative humidity in September in Iiyama is 83%.Rainfall
In Iiyama, in September, during 17.7 rainfall days, 70mm (2.76") of precipitation is typically accumulated. In Iiyama, during the entire year, the rain falls for 201.2 days and collects up to 928mm (36.54") of precipitation.Snowfall
In Iiyama, snow does not fall in May through October.Daylight
The average length of the day in September is 12h and 26min.On the first day of September, sunrise is at 05:17 and sunset at 18:15. On the last day of the month, sunrise is at 05:41 and sunset at 17:31 JST.
Sunshine
In Iiyama, the average sunshine in September is 8.6h.UV index
In Iiyama, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The maximum daily UV index of 4 during September translates into the following directions:
Proceed with care. Light skin individuals may be exposed to burns in fewer than 30 minutes. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Iiyama, Japan
- Average high temperature in September: 22.6°C
The warmest month (with the highest average high temperature) is August (27.8°C).
The month with the lowest average high temperature is January (0.8°C).
- Average low temperature in September: 13.4°C
The month with the highest average low temperature is August (17.7°C).
The coldest month (with the lowest average low temperature) is January (-6.5°C).
Average pressure in September
Iiyama, Japan
- Average pressure in September: 1013.9mbar
The month with the highest atmospheric pressure is November (1019.2mbar).
The month with the lowest atmospheric pressure is June (1009.2mbar).
Average wind speed in September
Iiyama, Japan
- Average wind speed in September: 6.6km/h
The windiest month (with the highest average wind speed) is January (8.9km/h).
The calmest month (with the lowest average wind speed) is August (5.6km/h).
Average humidity in September
Iiyama, Japan
- Average humidity in September: 83%
The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Iiyama, Japan
- Average rainfall in September: 70mm
The wettest month (with the highest rainfall) is July (160mm).
The driest month (with the least rainfall) is November (47mm).
Average rainfall days in September
Iiyama, Japan
- Average rainfall days in September: 17.7 days
The month with the highest number of rainy days is July (24.9 days).
The month with the least rainy days is February (9.9 days).
Average snowfall in September
Iiyama, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (398mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Iiyama, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (20.6 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
Iiyama, 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: 8h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 5h and 0min).
Average sunshine days in September
Iiyama, Japan
- Average sunshine days in September: 9.1 days
The month with the most sunshine days is May (12.2 days).
The month with the least sunshine days is July (4.3 days).
Average UV index in September
Iiyama, Japan
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Iiyama, Japan
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is May (Cloud cover 33).
Average visibility in September
Iiyama, Japan
- Average visibility in September: 8km
The months with the highest visibility are April, May and November (9km).
The months with the lowest visibility are January, February, March, June, July, August, September, October and December (8km).
