Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
Entering September, the average high-temperature is recorded at an agreeable 20.9°C (69.6°F), exhibiting a minimal shift from August's 23.7°C (74.7°F). Throughout the month of September, the nighttime temperature dips to an average of 15.4°C (59.7°F).Humidity
In Shiraoi, the average relative humidity in September is 80%.Rainfall
In Shiraoi, during September, the rain falls for 12.4 days and regularly aggregates up to 45mm (1.77") of precipitation. Throughout the year, there are 119.1 rainfall days, and 428mm (16.85") of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Shiraoi, Japan, the average length of the day in September is 12h and 30min.On the first day of September, sunrise is at 04:59 and sunset at 18:09. On the last day of the month, sunrise is at 05:30 and sunset at 17:18 JST.
Sunshine
In September, the average sunshine is 8.3h.UV index
In Shiraoi, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 4 translates into these guidelines:
Put precautions into practice - Guidance to elude sunburn is provided. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September in Shiraoi?
What is the average humidity in September in Shiraoi?
How much does it rain in Shiraoi in September?
When it does not snow in Shiraoi?
How many hours of daylight does Shiraoi have in September?
What time are sunrise and sunset in September in Shiraoi?
How long on average sun shines in September in Shiraoi?
What is the UV index intensity in September in Shiraoi?
Average temperature in September
Shiraoi, Japan
- Average high temperature in September: 20.9°C
The warmest month (with the highest average high temperature) is August (23.7°C).
The month with the lowest average high temperature is January (-1.4°C).
- Average low temperature in September: 15.4°C
The month with the highest average low temperature is August (18.3°C).
The coldest month (with the lowest average low temperature) is February (-7.2°C).
Average pressure in September
Shiraoi, Japan
- Average pressure in September: 1013.6mbar
The month with the highest atmospheric pressure is November (1016.3mbar).
The month with the lowest atmospheric pressure is July (1008.8mbar).
Average wind speed in September
Shiraoi, Japan
- Average wind speed in September: 12.3km/h
The windiest month (with the highest average wind speed) is December (15.9km/h).
The calmest month (with the lowest average wind speed) is July (10.5km/h).
Average humidity in September
Shiraoi, Japan
- Average humidity in September: 80%
The month with the highest relative humidity is July (87%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in September
Shiraoi, Japan
- Average rainfall in September: 45mm
The wettest month (with the highest rainfall) is August (65mm).
The driest month (with the least rainfall) is January (17mm).
Average rainfall days in September
Shiraoi, Japan
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is July (14.8 days).
The months with the least rainy days are January and February (3.9 days).
Average snowfall in September
Shiraoi, Japan
- Average snowfall in September: 0mm
The month with the highest snowfall is February (119mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Shiraoi, Japan
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.8 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
Shiraoi, Japan
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 2min
The month with the most sunshine is May (Average sunshine: 9h and 18min).
The months with the least sunshine are January and February (Average sunshine: 4h and 0min).
Average sunshine days in September
Shiraoi, Japan
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is January (19.9 days).
The month with the least sunshine days is July (12.8 days).
Average UV index in September
Shiraoi, Japan
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Shiraoi, Japan
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is October (Cloud cover 33).
Average visibility in September
Shiraoi, Japan
- Average visibility in September: 10km
The months with the highest visibility are January, April, September, October, November and December (10km).
The month with the lowest visibility is July (8km).
