September weather forecastSmithville, WA
September
Weather in September
September, the first month of the autumn in Smithville, is still a pleasant month, with an average temperature ranging between min 50.7°F (10.4°C) and max 71.6°F (22°C).Temperature
A shift in the average high-temperature occurs in September, reducing from a moderately hot 81.3°F (27.4°C) in August to an agreeable 71.6°F (22°C). Throughout September, Smithville witnesses a consistent average low-temperature of 50.7°F (10.4°C).Humidity
In September, the average relative humidity is 58%.Rainfall
In Smithville, Washington, during September, the rain falls for 6.9 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, there are 133.5 rainfall days, and 16.93" (430mm) of precipitation is accumulated.Snowfall
In Smithville, snow does not fall in April through October.Daylight
In Smithville, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:26 am and sunset at 7:41 pm. On the last day of September, sunrise is at 7:02 am and sunset at 6:45 pm PDT.
Sunshine
In Smithville, the average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Smithville, WA
- Average high temperature in September: 71.6°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is December (37°F).
- Average low temperature in September: 50.7°F
The month with the highest average low temperature is August (55.8°F).
The coldest month (with the lowest average low temperature) is December (27.1°F).
Average pressure in September
Smithville, WA
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed in September
Smithville, WA
- Average wind speed in September: 5.5mph
The windiest month (with the highest average wind speed) is June (7.1mph).
The calmest months (with the lowest average wind speed) are January and December (4.8mph).
Average humidity in September
Smithville, WA
- Average humidity in September: 58%
The months with the highest relative humidity are January and December (85%).
The months with the lowest relative humidity are July and August (51%).
Average rainfall in September
Smithville, WA
- Average rainfall in September: 0.59"
The wettest month (with the highest rainfall) is January (2.99").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Smithville, WA
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is March (16.3 days).
The month with the least rainy days is August (3.2 days).
Average snowfall in September
Smithville, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (4.29").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Smithville, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (4.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Smithville, WA
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in September: 10h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 48min).
Average sunshine days in September
Smithville, WA
- Average sunshine days in September: 21.6 days
The month with the most sunshine days is July (26.8 days).
The month with the least sunshine days is March (10.6 days).
Average UV index in September
Smithville, WA
- Average UV index in September: 4
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 2).
Average cloud cover in September
Smithville, WA
- Average cloud cover in September: 18
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Smithville, WA
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
