September weather forecastRumoi, Japan
September
Weather in September
The first month of the autumn, September, is also an enjoyable month in Rumoi, Japan, with an average temperature fluctuating between 19.8°C (67.6°F) and 14.8°C (58.6°F).Temperature
The onset of September entails a subtle temperature shift, as the average high-temperature eases from an agreeable 22.9°C (73.2°F) in August to a refreshing 19.8°C (67.6°F). The nights of September in Rumoi anticipate a slight dip from daytime high temperatures, settling to an average low-temperature of 14.8°C (58.6°F).Humidity
In Rumoi, the average relative humidity in September is 78%.Rainfall
In Rumoi, in September, during 16.6 rainfall days, 94mm (3.7") of precipitation is typically accumulated. Throughout the year, in Rumoi, Japan, there are 138.6 rainfall days, and 792mm (31.18") of precipitation is accumulated.Snowfall
In Rumoi, snow does not fall in June through September.Daylight
The average length of the day in September in Rumoi is 12h and 32min.On the first day of the month, sunrise is at 04:56 and sunset at 18:09. On the last day of September, sunrise is at 05:30 and sunset at 17:16 JST.
Sunshine
In Rumoi, the average sunshine in September is 8h.UV index
In Rumoi, Japan, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In September, the maximum UV index of 4 suggests these recommendations:
Adopt protective measures - Requirement to safeguard skin and eyes from harm exists. Around midday, solar radiation is most harmful; hence, exposure should be limited. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Rumoi, Japan
- Average high temperature in September: 19.8°C
The warmest month (with the highest average high temperature) is August (22.9°C).
The month with the lowest average high temperature is January (-2.3°C).
- Average low temperature in September: 14.8°C
The month with the highest average low temperature is August (17.8°C).
The coldest month (with the lowest average low temperature) is February (-6.5°C).
Average pressure in September
Rumoi, Japan
- Average pressure in September: 1013.1mbar
The month with the highest atmospheric pressure is November (1015.4mbar).
The month with the lowest atmospheric pressure is July (1008.4mbar).
Average wind speed in September
Rumoi, Japan
- Average wind speed in September: 14.1km/h
The windiest month (with the highest average wind speed) is December (22.6km/h).
The calmest month (with the lowest average wind speed) is July (10.3km/h).
Average humidity in September
Rumoi, Japan
- Average humidity in September: 78%
The month with the highest relative humidity is July (87%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Rumoi, Japan
- Average rainfall in September: 94mm
The wettest month (with the highest rainfall) is August (136mm).
The driest month (with the least rainfall) is February (35mm).
Average rainfall days in September
Rumoi, Japan
- Average rainfall days in September: 16.6 days
The month with the highest number of rainy days is August (18 days).
The month with the least rainy days is January (2.3 days).
Average snowfall in September
Rumoi, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is December (260mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Rumoi, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (21.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Rumoi, Japan
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 8h and 0min
The months with the most sunshine are May and August (Average sunshine: 8h and 48min).
The months with the least sunshine are January and December (Average sunshine: 1h and 24min).
Average sunshine days in September
Rumoi, Japan
- Average sunshine days in September: 10.6 days
The month with the most sunshine days is May (15.9 days).
The month with the least sunshine days is December (5.1 days).
Average UV index in September
Rumoi, 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, November and December (UV index 1).
Average cloud cover in September
Rumoi, Japan
- Average cloud cover in September: 37
The month with the most cloud cover is January (Cloud cover 88).
The month with the least cloud cover is September (Cloud cover 37).
Average visibility in September
Rumoi, Japan
- Average visibility in September: 10km
The months with the highest visibility are September and October (10km).
The months with the lowest visibility are January, February and December (8km).
