September weather forecastOnomichi, Japan
September
Weather in September
September, the first month of the autumn in Onomichi, is still a warm month, with an average temperature varying between 26.3°C (79.3°F) and 18.7°C (65.7°F).Temperature
The advent of September brings a subtle shift in temperature, with the average high moving from a tropical 30.8°C (87.4°F) in August to a warm 26.3°C (79.3°F). In September, Onomichi experiences an average nighttime temperature of 18.7°C (65.7°F).Humidity
In September, the average relative humidity is 78%.Rainfall
In Onomichi, during September, the rain falls for 11 days and regularly aggregates up to 30mm (1.18") of precipitation. Throughout the year, in Onomichi, there are 118.5 rainfall days, and 329mm (12.95") of precipitation is accumulated.Snowfall
In Onomichi, snow does not fall in March through November.Sea temperature
In Onomichi, the average seawater temperature in September is 26°C (78.8°F).Note: Swimming, diving, and other activities in water temperatures between 25°C (77°F) and 29°C (84.2°F) are thought to be quite enjoyable and satisfying for extended periods, with no discomfort.
Daylight
In Onomichi, the average length of the day in September is 12h and 24min.On the first day of the month, sunrise is at 05:40 and sunset at 18:33. On the last day of September, in Onomichi, sunrise is at 06:01 and sunset at 17:53 JST.
Sunshine
The average sunshine in September in Onomichi, Japan, is 9h.UV index
The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary 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. Midday is the peak time for the Sun's radiation; stay in the shade and protect yourself. Experience reduced UV exposure by about half when donning a wide-brim hat. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Onomichi, Japan
- Average high temperature in September: 26.3°C
The warmest month (with the highest average high temperature) is August (30.8°C).
The month with the lowest average high temperature is January (7.1°C).
- Average low temperature in September: 18.7°C
The month with the highest average low temperature is August (22.9°C).
The coldest month (with the lowest average low temperature) is January (1.3°C).
Average pressure in September
Onomichi, Japan
- Average pressure in September: 1012.6mbar
The month with the highest atmospheric pressure is January (1020.8mbar).
The month with the lowest atmospheric pressure is June (1008.4mbar).
Average wind speed in September
Onomichi, Japan
- Average wind speed in September: 7.3km/h
The windiest month (with the highest average wind speed) is January (10.5km/h).
The calmest month (with the lowest average wind speed) is June (6.9km/h).
Average humidity in September
Onomichi, Japan
- Average humidity in September: 78%
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is May (71%).
Average rainfall in September
Onomichi, Japan
- Average rainfall in September: 30mm
The wettest month (with the highest rainfall) is July (69mm).
The driest month (with the least rainfall) is January (11mm).
Average rainfall days in September
Onomichi, Japan
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (6 days).
Average snowfall in September
Onomichi, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is January (6mm).
The months with the least snowfall are March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Onomichi, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Onomichi, Japan
- Average sea temperature in September: 26°C
The best month for swimming (with the highest average sea temperature) is August (27.2°C).
The coldest month (with the lowest average sea temperature) is February (13.7°C).
Average daylight in September /
Average sunshine in September
Onomichi, Japan
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in September: 9h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Onomichi, Japan
- Average sunshine days in September: 17.6 days
The month with the most sunshine days is May (21.6 days).
The month with the least sunshine days is July (13.3 days).
Average UV index in September
Onomichi, 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
Onomichi, Japan
- Average cloud cover in September: 39
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in September
Onomichi, Japan
- Average visibility in September: 9km
The month with the highest visibility is January (10km).
The months with the lowest visibility are February, March, April, May, June, July, August, September, October, November and December (9km).
