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
With September's arrival, Hooper's weather changes as the average high-temperature falls from 85.1°F (29.5°C) in August to a still warm 74.3°F (23.5°C). Nighttime temperature in Hooper, Washington, experiences an average drop to a moderate 56.3°F (13.5°C) in September.Humidity
In September, the average relative humidity is 42%.Rainfall
In September, the rain falls for 6.6 days. Throughout September, 0.39" (10mm) of precipitation is accumulated. In Hooper, Washington, during the entire year, the rain falls for 109 days and collects up to 10.59" (269mm) of precipitation.Snowfall
January through April, September through December are months with snowfall in Hooper. September is the first month it typically snows in Hooper. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Hooper, during the entire year, snow falls for 28.2 days and aggregates up to 12.48" (317mm) of snow.Daylight
The average length of the day in September is 12h and 32min.On the first day of September, sunrise is at 6:13 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:51 am and sunset at 6:33 pm PDT.
Sunshine
In Hooper, the average sunshine in September is 10.5h.UV index
The average daily maximum UV index in September in Hooper is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: An average maximum UV index of 4 in September leads to these recommendations:
Ensure safety - Recommendations to avert sunburn are presented. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What is the temperature in September in Hooper?
What is the average humidity in September in Hooper?
How many days does it rain in September in Hooper?
When does it start to snow in Hooper?
What is the average length of the day in September in Hooper?
When is the sunrise / sunset in September in Hooper?
How many hours of sunshine does Hooper have in September?
What is the UV index reading in September in Hooper?
Average temperature in September
Hooper, WA
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is December (33.8°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is August (64.6°F).
The coldest month (with the lowest average low temperature) is December (25.2°F).
Average pressure in September
Hooper, 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 (29.9"Hg).
Average wind speed in September
Hooper, WA
- Average wind speed in September: 8mph
The windiest month (with the highest average wind speed) is March (9.8mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).
Average humidity in September
Hooper, WA
- Average humidity in September: 42%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Hooper, WA
- Average rainfall in September: 0.39"
The wettest month (with the highest rainfall) is March (1.38").
The driest months (with the least rainfall) are July and August (0.31").
Average rainfall days in September
Hooper, WA
- Average rainfall days in September: 6.6 days
The month with the highest number of rainy days is March (13.6 days).
The month with the least rainy days is July (4.2 days).
Average snowfall in September
Hooper, WA
- Average snowfall in September: 0.04"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Hooper, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (7.8 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Hooper, 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: 10h and 3min
The months with the most sunshine are July and August (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 4h and 36min).
Average sunshine days in September
Hooper, WA
- Average sunshine days in September: 21.9 days
The month with the most sunshine days is July (25.3 days).
The month with the least sunshine days is March (14.2 days).
Average UV index in September
Hooper, 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
Hooper, WA
- Average cloud cover in September: 18
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in September
Hooper, 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).
Hooper, Washington, USA
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