September weather forecastIwanuma, Japan
September
Weather in September
September, the first month of the autumn in Iwanuma, is still a warm month, with an average temperature fluctuating between 17.8°C (64°F) and 23.8°C (74.8°F).Temperature
September brings a minor shift in the average high-temperature, adjusting from a moderately hot 27.6°C (81.7°F) in August to a still warm 23.8°C (74.8°F). Throughout the month of September, Iwanuma witnesses an average temperature of 17.8°C (64°F).Humidity
In September, the average relative humidity is 80%.Rainfall
In Iwanuma, during September, the rain falls for 13.5 days and regularly aggregates up to 80mm (3.15") of precipitation. Throughout the year, in Iwanuma, Japan, there are 141.6 rainfall days, and 753mm (29.65") of precipitation is accumulated.Snowfall
In Iwanuma, Japan, snow does not fall in May through November.Daylight
The average length of the day in September in Iwanuma is 12h and 26min.On the first day of the month, sunrise is at 05:06 and sunset at 18:06. On the last day of September, sunrise is at 05:31 and sunset at 17:21 JST.
Sunshine
The average sunshine in September in Iwanuma is 7.7h.UV index
The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: In September, the maximum UV index of 5 translates into these guidelines:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Iwanuma, Japan
- Average high temperature in September: 23.8°C
The warmest month (with the highest average high temperature) is August (27.6°C).
The month with the lowest average high temperature is January (3.6°C).
- Average low temperature in September: 17.8°C
The month with the highest average low temperature is August (21.5°C).
The coldest month (with the lowest average low temperature) is February (-1.2°C).
Average pressure in September
Iwanuma, Japan
- Average pressure in September: 1014.1mbar
The month with the highest atmospheric pressure is November (1018.7mbar).
The month with the lowest atmospheric pressure is June (1009.3mbar).
Average wind speed in September
Iwanuma, Japan
- Average wind speed in September: 10.2km/h
The windiest month (with the highest average wind speed) is January (15.4km/h).
The calmest month (with the lowest average wind speed) is July (8.4km/h).
Average humidity in September
Iwanuma, Japan
- Average humidity in September: 80%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is April (72%).
Average rainfall in September
Iwanuma, Japan
- Average rainfall in September: 80mm
The wettest month (with the highest rainfall) is July (118mm).
The driest month (with the least rainfall) is February (22mm).
Average rainfall days in September
Iwanuma, Japan
- Average rainfall days in September: 13.5 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in September
Iwanuma, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (67mm).
The months with the least snowfall are May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Iwanuma, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (7 days).
The months with the least snowfall days are May, June, July, August, September, October and November (0 days).
Average daylight in September /
Average sunshine in September
Iwanuma, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 7h and 42min
The month with the most sunshine is May (Average sunshine: 9h and 36min).
The months with the least sunshine are January and February (Average sunshine: 5h and 6min).
Average sunshine days in September
Iwanuma, Japan
- Average sunshine days in September: 14.8 days
The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is July (8.6 days).
Average UV index in September
Iwanuma, Japan
- Average UV index in September: 5
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March and December (UV index 2).
Average cloud cover in September
Iwanuma, Japan
- Average cloud cover in September: 40
The month with the most cloud cover is July (Cloud cover 48).
The month with the least cloud cover is May (Cloud cover 35).
Average visibility in September
Iwanuma, Japan
- Average visibility in September: 9km
The months with the highest visibility are January, February, March, October, November and December (10km).
The months with the lowest visibility are April, May, June, July, August and September (9km).
