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 move into September indicates a reduction in the average high-temperature, down from August's hot 89.1°F (31.7°C) to a warm 77.9°F (25.5°C). During the month of September, an average temperature of 57.2°F (14°C) is noted during the nights.Humidity
The average relative humidity in September is 43%.Rainfall
In Pasco, in September, during 4.7 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. Throughout the year, there are 101.7 rainfall days, and 7.36" (187mm) of precipitation is accumulated.Snowfall
In Pasco, snow does not fall in April through October.Daylight
In Pasco, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:34 pm. On the last day of September, sunrise is at 6:54 am and sunset at 6:37 pm PDT.
Sunshine
The average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Pasco?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
What is the average length of the day in September?
What time are sunrise and sunset in September in Pasco?
How many hours of sunshine does Pasco have in September?
What is the UV index reading in September?
Average temperature in September
Pasco, WA
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is December (37.8°F).
- Average low temperature in September: 57.2°F
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (27.7°F).
Average pressure in September
Pasco, WA
- Average pressure in September: 29.95"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
Pasco, WA
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.4mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity in September
Pasco, WA
- Average humidity in September: 43%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (35%).
Average rainfall in September
Pasco, WA
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is January (0.94").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Pasco, WA
- Average rainfall days in September: 4.7 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is August (3.5 days).
Average snowfall in September
Pasco, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Pasco, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Pasco, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Pasco, WA
- Average sunshine days in September: 23.5 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is February (14.7 days).
Average UV index in September
Pasco, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Pasco, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 44).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Pasco, WA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Pasco, Washington, USA
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