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
As August shifts into September, a slight alteration in temperatures is observed, with average highs reducing from a moderately hot 82°F (27.8°C) to an agreeable 72.7°F (22.6°C). Winchester reports a sharp reduction in temperature during September, averaging at a frosty 48.9°F (9.4°C) at night.Humidity
The average relative humidity in September is 51%.Rainfall
In Winchester, during September, the rain falls for 9.8 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, there are 133.5 rainfall days, and 28.9" (734mm) of precipitation is accumulated.Snowfall
Months with snowfall in Winchester, Idaho, are January through June, September through December. September is the first month it typically snows in Winchester. 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 September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:08 am and sunset at 7:24 pm. On the last day of September, 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
In September, the average daily maximum UV index in Winchester is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Prioritize safety - Suggestions to prevent sun damage are offered. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Frequently asked questions
What is the temperature in September in Winchester?
What is the average humidity in September in Winchester?
How much does it rain in Winchester in September?
When does it start snowing in Winchester?
How many hours of daylight does Winchester have in September?
When are sunrise and sunset in September in Winchester?
How many hours of sunshine does Winchester have in September?
How high is the UV index in September in Winchester?
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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