September weather forecast
Post Falls, ID

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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

September in Post Falls brings in the beautiful hues of fall with a visible drop in temperature. This month records a decrease in the temperature high to 71.4°F (21.9°C) from the scorching 82°F (27.8°C) in August. The city witnesses a short-lived resurgence in rainfall before the drier months of October and November, enhancing the rich autumn colors. As daylight hours retract and temperatures dip, residents begin preparing for winter. September leaves behind gorgeous fall colors, paving the way for the advancing chill of October.

Temperature

In the transition to September, Post Falls observes a drop in the average high-temperature, moving from a moderately hot 82°F (27.8°C) in August to an agreeable 71.4°F (21.9°C). September in Post Falls is characterized by a distinct thermal shift, with nighttime lows averaging at a chilly 45°F (7.2°C).

Humidity

In September, the average relative humidity is 58%.

Rainfall

In Post Falls, in September, it is raining for 8.4 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, in Post Falls, there are 141.2 rainfall days, and 22.6" (574mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, September through December. 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

In September, the average length of the day is 12h and 33min.
On the first day of September, sunrise is at 6:07 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:28 pm PDT.

Sunshine

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

UV index

In Post Falls, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the maximum UV index of 4 translates into these guidelines:
Put precautions into practice - Protective measures against sun-induced damage are advised. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the usual temperature for Post Falls in September?

The high-temperature, in September, in Post Falls, records 71.4°F (21.9°C), while the low-temperature is 45°F (7.2°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, 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 much does it rain in Post Falls in September?

In Post Falls, Idaho, during September, the rain falls for 8.4 days and regularly aggregates up to 0.79" (20mm) of precipitation.

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?

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

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

In September, on the first day of the month, sunrise is at 6:07 am and sunset at 7:27 pm. On the last day of the month, in Post Falls, Idaho, sunrise is at 6:46 am and sunset at 6:28 pm PDT.

How many hours of sunshine does Post Falls have in September?

The average sunshine duration in September in Post Falls is 9.8h.

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

In September, the average daily maximum UV index in Post Falls, Idaho, is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
82°F 27.8°C
71.4°F 21.9°C
54.9°F 12.7°C
Average low temperature
51.8°F 11°C
45°F 7.2°C
36.5°F 2.5°C
Average pressure
29.91" 760mmHg
29.96" 761mmHg
30.05" 763mmHg
Average wind speed
4.1mph 6.6km/h
4.1mph 6.6km/h
4.3mph 6.9km/h
Average max. wind speed
4.8mph 7.7km/h
4.4mph 7.1km/h
4.8mph 7.7km/h
Average wind speed gusts
6.4mph 10.3km/h
6.7mph 10.8km/h
7mph 11.3km/h
Average humidity
48%
58%
72%
Average rainfall
0.43" 11mm
0.79" 20mm
2.13" 54mm
Average rainfall days
5.6
8.4
13.9
Average snowfall
0" 0mm
0.31" 8mm
0.43" 11mm
Average snowfall days
0
0.2
1
Average daylight
14h 1min
12h 3min
10h 5min
Average sunshine
11h 5min
9h 5min
6h 1min
Average sunshine days
22.7
19.8
15.7
Average UV index
5
4
2
Average cloud cover
13%
23%
39%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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 3min

The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).

  • 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: 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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Post Falls, Idaho, USA

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