September weather forecastPost Falls, ID
September
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
September brings a drop in Post Falls's average high-temperature, falling from a warm 82°F (27.8°C) in August to an agreeable 71.4°F (21.9°C). Despite the hot September days, Post Falls's nights see an average temperature plunge to a chilly 45°F (7.2°C).Humidity
In September, the average relative humidity in Post Falls is 58%.Rainfall
In Post Falls, in September, during 8.4 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. Throughout the year, there are 141.2 rainfall days, and 22.6" (574mm) 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 0.31" (8mm) of snow. Throughout the year, there are 71.8 snowfall days, and 56.54" (1436mm) of snow is accumulated.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
The average sunshine in September is 9.8h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for the average person.Note: A typical high UV index of 4 in September suggests the following recommendations:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be alert! Nearly double the UV rays from the Sun can be reflected by snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Post Falls, ID
- Average daylight in September: 12h and 30min
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 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).
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).
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).
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).
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).
