Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The arrival of September corresponds with a reduction in the average high-temperature, down from August's 84.7°F (29.3°C) to a still moderately hot 73.9°F (23.3°C). Compared to daytime temperatures, Pierce's temperature drops significantly, averaging a chilly 48°F (8.9°C) during the nights of September.Humidity
In September, the average relative humidity is 53%.Rainfall
In September, the rain falls for 7.2 days. Throughout September, 0.71" (18mm) of precipitation is accumulated. Throughout the year, in Pierce, there are 146.2 rainfall days, and 21.65" (550mm) of precipitation is accumulated.Snowfall
In Pierce, snow does not fall in May through September.Daylight
The average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:04 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:41 am and sunset at 6:24 pm PDT.
Sunshine
In September, the average sunshine in Pierce is 9.9h.UV index
In Pierce, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 4 during September translates into the following guidance:
Prioritize safety - Recommendations to avert sunburn are shared. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
Does it snow in September?
How many hours of daylight does Pierce have in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Pierce, ID
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is August (84.7°F).
The month with the lowest average high temperature is December (34.2°F).
- Average low temperature in September: 48°F
The month with the highest average low temperature is August (53.2°F).
The coldest month (with the lowest average low temperature) is December (22.8°F).
Average pressure in September
Pierce, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.2"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Pierce, ID
- Average wind speed in September: 3.7mph
The windiest month (with the highest average wind speed) is April (4.6mph).
The calmest month (with the lowest average wind speed) is September (3.7mph).
Average humidity in September
Pierce, ID
- Average humidity in September: 53%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (46%).
Average rainfall in September
Pierce, ID
- Average rainfall in September: 0.71"
The wettest months (with the highest rainfall) are January and March (2.8").
The driest month (with the least rainfall) is August (0.31").
Average rainfall days in September
Pierce, ID
- Average rainfall days in September: 7.2 days
The month with the highest number of rainy days is March (19 days).
The month with the least rainy days is August (4.4 days).
Average snowfall in September
Pierce, ID
- Average snowfall in September: 0"
The month with the highest snowfall is February (6.57").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Pierce, ID
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (10.8 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Pierce, 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 42min).
- 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 January (Average sunshine: 4h and 18min).
Average sunshine days in September
Pierce, ID
- Average sunshine days in September: 21.6 days
The month with the most sunshine days is July (24.7 days).
The month with the least sunshine days is February (8.4 days).
Average UV index in September
Pierce, 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
Pierce, ID
- Average cloud cover in September: 21
The month with the most cloud cover is February (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Pierce, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Pierce, Idaho, USA
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