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's arrival comes with a decrease in the average high-temperature, moving from a moderately hot 79.2°F (26.2°C) in August to an enjoyable 67.8°F (19.9°C). Oroville registers a prominent dip from daytime highs, with an average of 42.8°F (6°C) during the nights of September.Humidity
The average relative humidity in September in Oroville is 60%.Rainfall
In Oroville, during September, the rain falls for 9.6 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, there are 112.2 rainfall days, and 14.69" (373mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 2.09" (53mm) of snow. Throughout the year, there are 89.6 snowfall days, and 47.44" (1205mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:15 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:37 pm PDT.
Sunshine
In Oroville, the average sunshine in September is 10.4h.UV index
In September, the average daily maximum UV index in Oroville is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 3 during September translates into the following recommendations:
Take necessary precautions - Suggestions to elude sunburn are provided. Midday is when the Sun's radiation is strongest; avoid prolonged exposure during this time. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Frequently asked questions
What are the temperatures in Oroville in September?
What is the average humidity in September in Oroville?
How much does it rain in Oroville in September?
When does it start snowing in Oroville?
What is the average length of the day in September in Oroville?
What time are sunrise and sunset in September in Oroville?
How many hours of sunshine does Oroville have in September?
How high is the UV index in September in Oroville?
Average temperature in September
Oroville, WA
- Average high temperature in September: 67.8°F
The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (27°F).
- Average low temperature in September: 42.8°F
The month with the highest average low temperature is August (49.5°F).
The coldest month (with the lowest average low temperature) is December (13.1°F).
Average pressure in September
Oroville, WA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Oroville, WA
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is April (4.5mph).
The calmest months (with the lowest average wind speed) are January, February and December (3.7mph).
Average humidity in September
Oroville, WA
- Average humidity in September: 60%
The month with the highest relative humidity is January (94%).
The month with the lowest relative humidity is August (49%).
Average rainfall in September
Oroville, WA
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is August (0.47").
Average rainfall days in September
Oroville, WA
- Average rainfall days in September: 9.6 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is December (5.7 days).
Average snowfall in September
Oroville, WA
- Average snowfall in September: 2.09"
The month with the highest snowfall is December (9.76").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Oroville, WA
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is January (18.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Oroville, WA
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in September: 10h and 2min
The month with the most sunshine is August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Oroville, WA
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is August (22.4 days).
The month with the least sunshine days is March (10.8 days).
Average UV index in September
Oroville, WA
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Oroville, WA
- Average cloud cover in September: 23
The month with the most cloud cover is January (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 14).
Average visibility in September
Oroville, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Oroville, Washington, USA
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