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 transition into September involves a decrease in the average high-temperature, falling from a hot 86.2°F (30.1°C) in August to a moderately hot 75.4°F (24.1°C). In Sunnyside, in September, the average low-temperature is a cool 54.9°F (12.7°C).Humidity
In September, the average relative humidity in Sunnyside is 46%.Rainfall
In September, in Sunnyside, the rain falls for 5.5 days. Throughout September, 0.35" (9mm) of precipitation is accumulated. Throughout the year, in Sunnyside, there are 104.5 rainfall days, and 8.23" (209mm) of precipitation is accumulated.Snowfall
January through March, September, November and December are months with snowfall. September is the first month it typically snows in Sunnyside. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. In Sunnyside, during the entire year, snow falls for 15.6 days and aggregates up to 7.36" (187mm) of snow.Daylight
The average length of the day in September in Sunnyside is 12h and 32min.On the first day of September, sunrise is at 6:21 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:41 pm PDT.
Sunshine
In Sunnyside, Washington, the average sunshine in September is 10.7h.UV index
In Sunnyside, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the UV index of 4 transforms into the following advice:
Make use of precautions - Suggestions to resist sunburn are communicated. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Frequently asked questions
What are September temperatures in Sunnyside?
What is the average humidity in September in Sunnyside?
How much does it rain in Sunnyside in September?
When does it start snowing in Sunnyside?
What is the average length of the day in September in Sunnyside?
What time are sunrise and sunset in September in Sunnyside?
How long on average sun shines in September in Sunnyside?
How high is the UV index in September in Sunnyside?
Average temperature in September
Sunnyside, WA
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (36.1°F).
- Average low temperature in September: 54.9°F
The month with the highest average low temperature is August (61.5°F).
The coldest month (with the lowest average low temperature) is December (25.3°F).
Average pressure in September
Sunnyside, WA
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is August (29.92"Hg).
Average wind speed in September
Sunnyside, WA
- Average wind speed in September: 6.6mph
The windiest month (with the highest average wind speed) is April (8.3mph).
The calmest month (with the lowest average wind speed) is December (5mph).
Average humidity in September
Sunnyside, WA
- Average humidity in September: 46%
The month with the highest relative humidity is January (83%).
The months with the lowest relative humidity are July and August (38%).
Average rainfall in September
Sunnyside, WA
- Average rainfall in September: 0.35"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in September
Sunnyside, WA
- Average rainfall days in September: 5.5 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (4.1 days).
Average snowfall in September
Sunnyside, WA
- Average snowfall in September: 0.2"
The month with the highest snowfall is December (2.24").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Sunnyside, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (5 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Sunnyside, 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 months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in September
Sunnyside, WA
- Average sunshine days in September: 22.6 days
The month with the most sunshine days is July (26.2 days).
The month with the least sunshine days is March (15.4 days).
Average UV index in September
Sunnyside, WA
- Average UV index in September: 4
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Sunnyside, WA
- Average cloud cover in September: 17
The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in September
Sunnyside, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and December (5mi).
Sunnyside, Washington, USA
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