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
A shift in the average high-temperature occurs in September, reducing from a tropical 86.5°F (30.3°C) in August to a moderately hot 74.8°F (23.8°C). In the month of September, an average of 53.4°F (11.9°C) marks the low-temperature in Union Gap.Humidity
In Union Gap, the average relative humidity in September is 48%.Rainfall
In Union Gap, in September, during 3.9 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In Union Gap, during the entire year, the rain falls for 82.2 days and collects up to 5.43" (138mm) of precipitation.Snowfall
January through March, September, November and December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. Throughout the year, there are 18.5 snowfall days, and 7.8" (198mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 32min.On the first day of September in Union Gap, Washington, sunrise is at 6:23 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 6:42 pm PDT.
Sunshine
In September, the average sunshine is 11.1h.UV index
In Union Gap, Washington, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the UV index of 4 transforms into the following advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Frequently asked questions
What is the temperature in September in Union Gap?
What is the average humidity in September in Union Gap?
How many days does it rain in September in Union Gap?
When does it start to snow in Union Gap?
What is the average length of the day in September in Union Gap?
When is the sunrise / sunset in September in Union Gap?
How many hours of sunshine does Union Gap have in September?
What is the UV index intensity in September in Union Gap?
Average temperature in September
Union Gap, WA
- Average high temperature in September: 74.8°F
The warmest month (with the highest average high temperature) is August (86.5°F).
The month with the lowest average high temperature is December (36.9°F).
- Average low temperature in September: 53.4°F
The month with the highest average low temperature is August (60.3°F).
The coldest month (with the lowest average low temperature) is December (25.5°F).
Average pressure in September
Union Gap, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.93"Hg).
Average wind speed in September
Union Gap, WA
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest month (with the lowest average wind speed) is December (4.4mph).
Average humidity in September
Union Gap, WA
- Average humidity in September: 48%
The month with the highest relative humidity is January (81%).
The months with the lowest relative humidity are July and August (39%).
Average rainfall in September
Union Gap, WA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is January (0.87").
The driest month (with the least rainfall) is July (0.08").
Average rainfall days in September
Union Gap, WA
- Average rainfall days in September: 3.9 days
The month with the highest number of rainy days is March (10.8 days).
The month with the least rainy days is August (2 days).
Average snowfall in September
Union Gap, WA
- Average snowfall in September: 0.04"
The month with the highest snowfall is December (2.76").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Union Gap, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (5.4 days).
The months with the least snowfall days are May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Union Gap, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 11h and 1min
The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Union Gap, WA
- Average sunshine days in September: 23.8 days
The month with the most sunshine days is July (27.5 days).
The month with the least sunshine days is February (15.8 days).
Average UV index in September
Union Gap, 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
Union Gap, WA
- Average cloud cover in September: 14
The month with the most cloud cover is January (Cloud cover 40).
The months with the least cloud cover are July and August (Cloud cover 9).
Average visibility in September
Union Gap, WA
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Union Gap, Washington, USA
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