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
September brings a minor shift in the average high-temperature, adjusting from a pleasant 69.1°F (20.6°C) in August to a comfortable 62.6°F (17°C). Piedmont observes an average low-temperature of 45.5°F (7.5°C) during September.Humidity
The average relative humidity in September is 81%.Rainfall
In Piedmont, during September, the rain falls for 10.2 days and regularly aggregates up to 0.75" (19mm) of precipitation. In Piedmont, during the entire year, the rain falls for 150.3 days and collects up to 17.36" (441mm) of precipitation.Snowfall
In Piedmont, snow does not fall in May through October.Daylight
In September, the average length of the day is 12h and 33min.On the first day of the month, sunrise is at 6:34 am and sunset at 7:55 pm. On the last day of September, sunrise is at 7:14 am and sunset at 6:55 pm PDT.
Sunshine
The average sunshine in September is 8.6h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The average daily UV index of 3 in September transforms into the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Piedmont have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Piedmont have in September?
How high is the UV index in September?
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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