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
As Piedmont enters September, the average high-temperature subtly lowers from the a pleasant 69.1°F (20.6°C) of August to a comfortable 62.6°F (17°C). Piedmont records an average temperature drop to a chilly 45.5°F (7.5°C) in September.Humidity
The average relative humidity in September in Piedmont is 81%.Rainfall
In September, in Piedmont, the rain falls for 10.2 days. Throughout September, 0.75" (19mm) of precipitation is accumulated. Throughout the year, in Piedmont, there are 150.3 rainfall days, and 17.36" (441mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 33min.On the first day of September in Piedmont, sunrise is at 6:34 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:14 am and sunset at 6:55 pm PDT.
Sunshine
In September, the average sunshine in Piedmont is 8.6h.UV index
In Piedmont, Washington, the average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In September, the maximum UV index of 3 suggests this advice:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.
Frequently asked questions
What is the temperature in September in Piedmont?
What is the average humidity in September in Piedmont?
How much does it rain in Piedmont in September?
When it does not snow in Piedmont?
What is the average length of the day in September in Piedmont?
What time are sunrise and sunset in September in Piedmont?
How long on average sun shines in September in Piedmont?
What is the UV index reading in September in Piedmont?
Average temperature in September
Piedmont, WA
- Average high temperature in September: 62.6°F
The warmest month (with the highest average high temperature) is August (69.1°F).
The month with the lowest average high temperature is December (39.4°F).
- Average low temperature in September: 45.5°F
The month with the highest average low temperature is August (48.6°F).
The coldest months (with the lowest average low temperature) are February and December (31.5°F).
Average pressure in September
Piedmont, WA
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is July (30.07"Hg).
The month with the lowest atmospheric pressure is March (29.99"Hg).
Average wind speed in September
Piedmont, WA
- Average wind speed in September: 3.5mph
The windiest months (with the highest average wind speed) are January and November (5.2mph).
The calmest months (with the lowest average wind speed) are August and September (3.5mph).
Average humidity in September
Piedmont, WA
- Average humidity in September: 81%
The months with the highest relative humidity are January and December (89%).
The months with the lowest relative humidity are July and August (76%).
Average rainfall in September
Piedmont, WA
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is January (3.35").
The driest months (with the least rainfall) are July and August (0.43").
Average rainfall days in September
Piedmont, WA
- Average rainfall days in September: 10.2 days
The month with the highest number of rainy days is March (16.1 days).
The month with the least rainy days is August (5.4 days).
Average snowfall in September
Piedmont, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Piedmont, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Piedmont, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 8h and 4min
The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Piedmont, WA
- Average sunshine days in September: 16.8 days
The month with the most sunshine days is August (22.5 days).
The month with the least sunshine days is February (9.6 days).
Average UV index in September
Piedmont, WA
- Average UV index in September: 3
The months with the highest UV index are June, July and August (UV index 4).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in September
Piedmont, WA
- Average cloud cover in September: 38
The month with the most cloud cover is February (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in September
Piedmont, WA
- Average visibility in September: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (5mi).
The months with the lowest visibility are January, February, March and December (4mi).
Piedmont, Washington, USA
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