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 arrival of September corresponds with a shift in temperature, down from a moderately hot 78.4°F (25.8°C) in August to a pleasant 68.9°F (20.5°C). In Underwood, the nighttime chill during September is a clear shift from the day's highs, with an average of 47.1°F (8.4°C).Humidity
In Underwood, the average relative humidity in September is 66%.Rainfall
In Underwood, in September, during 9.2 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In Underwood, during the entire year, the rain falls for 159.7 days and collects up to 31.42" (798mm) of precipitation.Snowfall
In Underwood, snow does not fall in April through October.Daylight
The average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:28 am and sunset at 7:43 pm. On the last day of the month, sunrise is at 7:04 am and sunset at 6:47 pm PDT.
Sunshine
In Underwood, Washington, the average sunshine in September is 9.9h.UV index
In September, the average daily maximum UV index in Underwood is 3. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.Note: In September, a regular UV index of 3 translates into these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. It's recommended to limit sun exposure when its radiation is at its peak during midday. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears.
Frequently asked questions
What are September temperatures in Underwood?
What is the average humidity in September in Underwood?
How much does it rain in Underwood in September?
When it does not snow in Underwood?
How many hours of daylight does Underwood have in September?
When is the sunrise / sunset in September in Underwood?
How many hours of sunshine does Underwood have in September?
What is the UV index intensity in September in Underwood?
Average temperature in September
Underwood, WA
- Average high temperature in September: 68.9°F
The warmest month (with the highest average high temperature) is August (78.4°F).
The month with the lowest average high temperature is December (36°F).
- Average low temperature in September: 47.1°F
The month with the highest average low temperature is August (51.4°F).
The coldest month (with the lowest average low temperature) is December (27°F).
Average pressure in September
Underwood, WA
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is August (29.97"Hg).
Average wind speed in September
Underwood, WA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is June (6.1mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in September
Underwood, WA
- Average humidity in September: 66%
The months with the highest relative humidity are February and December (88%).
The month with the lowest relative humidity is July (59%).
Average rainfall in September
Underwood, WA
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is January (5.67").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
Underwood, WA
- Average rainfall days in September: 9.2 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is August (4.2 days).
Average snowfall in September
Underwood, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.76").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Underwood, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (4.1 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Underwood, 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: 9h and 5min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in September
Underwood, WA
- Average sunshine days in September: 18.7 days
The month with the most sunshine days is July (25.4 days).
The month with the least sunshine days is March (8.4 days).
Average UV index in September
Underwood, 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 and November (UV index 1).
Average cloud cover in September
Underwood, WA
- Average cloud cover in September: 29
The months with the most cloud cover are January and February (Cloud cover 64).
The months with the least cloud cover are July and August (Cloud cover 17).
Average visibility in September
Underwood, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (4mi).
Underwood, Washington, USA
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