September weather forecastNiimi, Japan
September
Weather in September
The first month of the autumn, September, is still a warm month in Niimi, Japan, with temperature in the range of an average high of 25.9°C (78.6°F) and an average low of 19°C (66.2°F).Temperature
Niimi's weather subtly changes with the onset of September, barely falling from a hot 30.5°C (86.9°F) in August to a moderately hot 25.9°C (78.6°F). Niimi witnesses a consistent average low-temperature of 19°C (66.2°F) throughout September.Humidity
In Niimi, the average relative humidity in September is 79%.Rainfall
In September, the rain falls for 13 days. Throughout September, 41mm (1.61") of precipitation is accumulated. In Niimi, during the entire year, the rain falls for 148 days and collects up to 439mm (17.28") of precipitation.Snowfall
April through November are months without snowfall in Niimi.Daylight
The average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 05:38 and sunset at 18:33. On the last day of September, sunrise is at 06:00 and sunset at 17:51 JST.
Sunshine
In September, the average sunshine in Niimi, Japan, is 9.3h.UV index
In Niimi, Japan, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In September, a regular UV index of 5 translates into these guidelines:
Heed the precautions - It is counselled to guard against solar damage. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Niimi, Japan
- Average high temperature in September: 25.9°C
The warmest month (with the highest average high temperature) is August (30.5°C).
The month with the lowest average high temperature is January (6.9°C).
- Average low temperature in September: 19°C
The month with the highest average low temperature is August (23.3°C).
The coldest month (with the lowest average low temperature) is January (1°C).
Average pressure in September
Niimi, Japan
- Average pressure in September: 1012.6mbar
The months with the highest atmospheric pressure are January and February (1020.5mbar).
The month with the lowest atmospheric pressure is June (1008.4mbar).
Average wind speed in September
Niimi, Japan
- Average wind speed in September: 7.8km/h
The windiest month (with the highest average wind speed) is January (11.6km/h).
The calmest month (with the lowest average wind speed) is June (7km/h).
Average humidity in September
Niimi, Japan
- Average humidity in September: 79%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Niimi, Japan
- Average rainfall in September: 41mm
The wettest month (with the highest rainfall) is July (81mm).
The driest month (with the least rainfall) is November (12mm).
Average rainfall days in September
Niimi, Japan
- Average rainfall days in September: 13 days
The month with the highest number of rainy days is July (21.3 days).
The month with the least rainy days is November (8.6 days).
Average snowfall in September
Niimi, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (11mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Niimi, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.5 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
Niimi, 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 54min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is August (Average sunshine: 10h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Niimi, Japan
- Average sunshine days in September: 13.9 days
The month with the most sunshine days is May (18.9 days).
The month with the least sunshine days is July (7.3 days).
Average UV index in September
Niimi, 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 2).
Average cloud cover in September
Niimi, Japan
- Average cloud cover in September: 36
The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility in September
Niimi, Japan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, August, October, November and December (10km).
The months with the lowest visibility are April, May, June, July and September (9km).
