September weather forecast
Moscow, ID

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Clean paths and scenic, neat lawns surrounding lone red barn in a field in Moscow, Idaho
Clean paths and scenic, neat lawns surrounding lone red barn in a field in Moscow, Idaho

Weather in September

September in Moscow, Idaho, marks the onset of the fall season, introducing refreshing changes in temperature patterns. The city witnesses a tapering down of the radiant summer aura, transitioning into a calm and cooling ambiance. Rainfall becomes sparse and the wind matures into a gentle rhythm. Daylight hours start to dwindle, making way for longer, cooler nights. September showcases a relieving respite from the summer charge, as temperatures drop between 51.4°F (10.8°C) to 73.4°F (23°C).

Temperature

The onset of September entails a temperature shift, as the average high-temperature decreases from 83.7°F (28.7°C) in August to a still moderately hot 73.4°F (23°C). In September, the nighttime temperature plummets remarkably from the daily apex to a steady average of 51.4°F (10.8°C).

Humidity

In Moscow, the average relative humidity in September is 48%.

Rainfall

In Moscow, in September, it is raining for 8.1 days, with typically 0.63" (16mm) of accumulated precipitation. Throughout the year, in Moscow, there are 143.2 rainfall days, and 20.51" (521mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.28" (7mm) of snow. In Moscow, during the entire year, snow falls for 60.2 days and aggregates up to 47.24" (1200mm) of snow.

Daylight

In Moscow, Idaho, the average length of the day in September is 12h and 32min.
On the first day of September, sunrise is at 6:08 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:28 pm PDT.

Sunshine

The average sunshine in September is 10.3h.

UV index

In Moscow, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: A daily high UV index of 4 in September leads to these guidelines:
Act with care - The need to guard against sun damage is communicated. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.

Frequently asked questions

What are September temperatures?

September temperatures vary between a high-temperature of 73.4°F (23°C) and a low-temperature of 51.4°F (10.8°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 82.4°F (28°C).

What is the average humidity in September?

In Moscow, the average relative humidity in September is 48%.

How much does it rain in September?

In Moscow, in September, it is raining for 8.1 days, with typically 0.63" (16mm) of accumulated precipitation.

When does it start to snow?

September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.28" (7mm) of snow.

How many hours of daylight does Moscow have in September?

In September, the average day length is 12h and 32min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:08 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:28 pm PDT.

How long on average sun shines in September?

In September, the average sunshine duration in Moscow is 10.3h.

What is the UV index intensity in September?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Moscow, ID

Average temperature in September - Moscow, ID
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is August (83.7°F).
The month with the lowest average high temperature is December (34°F).

  • Average low temperature in September: 51.4°F

The month with the highest average low temperature is August (58.1°F).
The coldest month (with the lowest average low temperature) is December (24.1°F).

Average pressure in September
Moscow, ID

Average pressure in September - Moscow, ID
  • Average pressure in September: 29.96"Hg

The month with the highest atmospheric pressure is January (30.2"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

Average wind speed in September
Moscow, ID

Average wind speed in September - Moscow, ID
  • Average wind speed in September: 4.8mph

The windiest month (with the highest average wind speed) is April (6.3mph).
The calmest months (with the lowest average wind speed) are July, August and September (4.8mph).

Average humidity in September
Moscow, ID

Average humidity in September - Moscow, ID
  • Average humidity in September: 48%

The month with the highest relative humidity is January (87%).
The month with the lowest relative humidity is August (40%).

Average rainfall in September
Moscow, ID

Average rainfall in September - Moscow, ID
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is December (2.68").
The driest months (with the least rainfall) are July and August (0.47").

Average rainfall days in September
Moscow, ID

Average rainfall days in September - Moscow, ID
  • Average rainfall days in September: 8.1 days

The month with the highest number of rainy days is April (18.1 days).
The months with the least rainy days are July and August (5.9 days).

Average snowfall in September
Moscow, ID

Average snowfall in September - Moscow, ID
  • Average snowfall in September: 0.28"

The month with the highest snowfall is January (12.56").
The months with the least snowfall are June, July and August (0").

Average snowfall days in September
Moscow, ID

Average snowfall days in September - Moscow, ID
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (14.1 days).
The months with the least snowfall days are June, July and August (0 days).

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

Average daylight in September / Average sunshine in September - Moscow, ID
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).

  • Average sunshine in September: 10h and 2min

The month with the most sunshine is August (Average sunshine: 12h and 0min).
The months with the least sunshine are January, February and December (Average sunshine: 4h and 30min).

Average sunshine days in September
Moscow, ID

Average sunshine days in September - Moscow, ID
  • Average sunshine days in September: 20.1 days

The month with the most sunshine days is July (23.3 days).
The month with the least sunshine days is February (9.2 days).

Average UV index in September
Moscow, ID

Average UV index in September - Moscow, ID
  • 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 February (UV index 1).

Average cloud cover in September
Moscow, ID

Average cloud cover in September - Moscow, ID
  • Average cloud cover in September: 19

The month with the most cloud cover is February (Cloud cover 54).
The months with the least cloud cover are July and August (Cloud cover 12).

Average visibility in September
Moscow, ID

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

The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (4mi).

Moscow, Idaho, USA

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