September weather forecast and climate
Winchester, ID

Weather in September

September, the first month of the autumn, in W"ter, is also an agreeable month, with average temperature fluctuating between 48.9°F (9.4°C) and 72.7°F (22.6°C).

Temperature

In September, the average high-temperature decreases, from a moderately hot 82°F (27.8°C) in August, to an agreeable 72.7°F (22.6°C). The average low-temperature, in W"ter, Idaho, is 48.9°F (9.4°C).

Humidity

In September, the average relative humidity is 51%.

Rainfall

In September, in W"ter, Idaho, the rain falls for 9.8 days. Throughout September, 1.1" (28mm) of precipitation is accumulated. In W"ter, Idaho, during the entire year, the rain falls for 133.5 days and collects up to 28.9" (734mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall in W"ter. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.47" (12mm) of snow. In W"ter, during the entire year, snow falls for 112.2 days, and aggregates up to 105.79" (2687mm) of snow.

Daylight

In W"ter, the average length of the day is 12.5h.

Sunshine

In September, the average sunshine is 9.9h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 4 interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in September in W"ter?

The average high-temperature, in September, in W"ter, Idaho, is 72.7°F (22.6°C), while the average low-temperature is 48.9°F (9.4°C).

What is the average humidity in September in W"ter?

In W"ter, Idaho, the average relative humidity in September is 51%.

How much does it rain in W"ter in September?

In W"ter, Idaho, during September, the rain falls for 9.8 days and regularly aggregates up to 1.1" (28mm) of precipitation.

When does it start snowing in W"ter?

September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.47" (12mm) of snow.

How many hours of daylight does W"ter have in September?

In W"ter, the average length of the day in September is 12.5h.

How many hours of sunshine does W"ter have in September?

In September, the average sunshine is 9.9h.

How high is the UV index in September in W"ter?

In W"ter, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Winchester, ID

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).

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Average pressure in September
Winchester, ID

Average pressure in September - Winchester, ID
  • Average pressure in September: 29.97"

The month with the highest atmospheric pressure is January (30.21").
Months with the lowest atmospheric pressure are June and August (29.93").

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Average wind speed in September
Winchester, ID

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).

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Average humidity in September
Winchester, ID

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%).

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Average rainfall in September
Winchester, ID

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").

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Average rainfall days in September
Winchester, ID

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).

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Average snowfall in September
Winchester, ID

Average snowfall in September - Winchester, ID
  • Average snowfall in September: 0.47"

The month with the highest snowfall is February (23.11").
Months with the least snowfall are July and August (0").

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Average snowfall days in September
Winchester, ID

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).
Months with the least snowfall days are July and August (0 days).

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Average daylight in September /
Average sunshine in September
Winchester, ID

Average daylight in September / Average sunshine in September - Winchester, ID
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in September: 9.9h

The month with the most sunshine is August (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 4.2h).

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Average sunshine days in September
Winchester, ID

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).

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Average UV index in September
Winchester, ID

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).
Months with the lowest UV index are February and December (UV index 1).

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Average cloud cover in September
Winchester, ID

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).

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Average visibility in September
Winchester, ID

Average visibility in September - Winchester, ID
  • Average visibility in September: 6mi

Months with the highest visibility are May, June, July, August, September and October (6mi).
Months with the lowest visibility are January, February and December (4mi).

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