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
Weather in September
Temperature
During Winchester's transition into September, the average high-temperature lessens, moving from a moderately hot 82°F (27.8°C) in August to an agreeable 72.7°F (22.6°C). A steady average of 48.9°F (9.4°C) throughout September in Winchester underscores a considerable divergence from the daytime high.Humidity
The average relative humidity in September in Winchester, Idaho, is 51%.Rainfall
In Winchester, in September, during 9.8 rainfall days, 1.1" (28mm) of precipitation is typically accumulated. Throughout the year, there are 133.5 rainfall days, and 28.9" (734mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, there are 112.2 snowfall days, and 105.79" (2687mm) of snow is accumulated.Daylight
In Winchester, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:08 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:27 pm PDT.
Sunshine
In Winchester, the average sunshine in September is 9.9h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Enhance your sun protection with tightly woven, yet airy clothing. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
How many hours of daylight does Winchester have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Winchester have in September?
What is the UV index reading in September?
Average temperature in September
Winchester, ID
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is August (54.7°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in September
Winchester, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Winchester, ID
- Average wind speed in September: 3.7mph
The windiest months (with the highest average wind speed) are January, February, March and November (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in September
Winchester, ID
- Average humidity in September: 51%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Winchester, ID
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in September
Winchester, ID
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is April (17.8 days).
The month with the least rainy days is January (6 days).
Average snowfall in September
Winchester, ID
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (23.11").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Winchester, ID
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (19.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Winchester, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in September
Winchester, ID
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is July (21.2 days).
The month with the least sunshine days is March (7.3 days).
Average UV index in September
Winchester, ID
- 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 February and December (UV index 1).
Average cloud cover in September
Winchester, ID
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Winchester, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Winchester, Idaho, USA
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