September weather forecast
Post Falls, ID

Corbin Park on the banks of the Spokane River flowing downstream in Post Falls, Idaho, USA
Corbin Park on the banks of the Spokane River flowing downstream in Post Falls, Idaho, USA

Weather in September

The first month of the autumn, September, is also an agreeable month in Post Falls, Idaho, with an average temperature ranging between max 71.4°F (21.9°C) and min 45°F (7.2°C).

Temperature

In Post Falls, the average high-temperature in September decreases from a moderately hot 82°F (27.8°C) in August to an agreeable 71.4°F (21.9°C). In September, the average low-temperature is 45°F (7.2°C).

Humidity

The average relative humidity in September in Post Falls is 58%.

Rainfall

In September, the rain falls for 8.4 days. Throughout September, 0.79" (20mm) of precipitation is accumulated. In Post Falls, Idaho, during the entire year, the rain falls for 141.2 days and collects up to 22.6" (574mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Post Falls, Idaho. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Post Falls, during the entire year, snow falls for 71.8 days and aggregates up to 56.54" (1436mm) of snow.

Daylight

The average length of the day in September is 12h and 33min.
On the first day of September in Post Falls, sunrise is at 6:06 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:29 pm PDT.

Sunshine

The average sunshine in September is 9.8h.

UV index

In Post Falls, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in September in Post Falls?

In Post Falls, in September, the average high-temperature is 71.4°F (21.9°C), and the average low-temperature is 45°F (7.2°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in August is appraised at 82.4°F (28°C).

What is the average humidity in September in Post Falls?

In September, the average relative humidity in Post Falls, Idaho, is 58%.

How many days does it rain in September in Post Falls?

In September, the rain falls for 8.4 days. Throughout September, 0.79" (20mm) of precipitation is accumulated.

When does it start snowing in Post Falls?

September is the first month it typically snows in Post Falls, Idaho. Throughout September, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow.

What is the average length of the day in September in Post Falls?

In Post Falls, Idaho, the average day length in September is 12h and 33min.

When is the sunrise / sunset in September in Post Falls?

On the first day of September in Post Falls, Idaho, sunrise is at 6:06 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:29 pm PDT.

How long on average sun shines in September in Post Falls?

In Post Falls, the average sunshine duration in September is 9.8h.

What is the UV index reading in September in Post Falls?

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Post Falls, ID

Average temperature in September - Post Falls, ID
  • Average high temperature in September: 71.4°F

The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (31.3°F).

  • Average low temperature in September: 45°F

The month with the highest average low temperature is August (51.8°F).
The coldest month (with the lowest average low temperature) is December (21.2°F).

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Average pressure in September
Post Falls, ID

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

The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).

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Average wind speed in September
Post Falls, ID

Average wind speed in September - Post Falls, ID
  • Average wind speed in September: 4.1mph

The windiest month (with the highest average wind speed) is April (5mph).
The calmest month (with the lowest average wind speed) is December (3.9mph).

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Average humidity in September
Post Falls, ID

Average humidity in September - Post Falls, ID
  • Average humidity in September: 58%

The month with the highest relative humidity is January (93%).
The month with the lowest relative humidity is August (48%).

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Average rainfall in September
Post Falls, ID

Average rainfall in September - Post Falls, ID
  • Average rainfall in September: 0.79"

The wettest month (with the highest rainfall) is January (3.27").
The driest months (with the least rainfall) are July and August (0.43").

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Average rainfall days in September
Post Falls, ID

Average rainfall days in September - Post Falls, ID
  • Average rainfall days in September: 8.4 days

The month with the highest number of rainy days is March (17.5 days).
The month with the least rainy days is August (5.6 days).

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Average snowfall in September
Post Falls, ID

Average snowfall in September - Post Falls, ID
  • Average snowfall in September: 0.31"

The month with the highest snowfall is January (16.57").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Post Falls, ID

Average snowfall days in September - Post Falls, ID
  • Average snowfall days in September: 0.2 days

The month with the highest number of snowfall days is December (16.9 days).
The months with the least snowfall days are June, July and August (0 days).

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Average daylight in September /
Average sunshine in September
Post Falls, ID

Average daylight in September / Average sunshine in September - Post Falls, ID
  • Average daylight in September: 12h and 33min

The month with the longest days is June (Average daylight: 15h and 56min).
The month with the shortest days is December (Average daylight: 8h and 29min).

  • Average sunshine in September: 9h and 48min

The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 24min).

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Average sunshine days in September
Post Falls, ID

Average sunshine days in September - Post Falls, ID
  • Average sunshine days in September: 19.8 days

The month with the most sunshine days is July (23.9 days).
The month with the least sunshine days is February (8.6 days).

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Average UV index in September
Post Falls, ID

Average UV index in September - Post Falls, 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, November and December (UV index 1).

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Average cloud cover in September
Post Falls, ID

Average cloud cover in September - Post Falls, ID
  • Average cloud cover in September: 23

The month with the most cloud cover is January (Cloud cover 65).
The month with the least cloud cover is August (Cloud cover 13).

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Average visibility in September
Post Falls, ID

Average visibility in September - Post Falls, ID
  • Average visibility in September: 6mi

The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).

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