September weather forecastTonasket, WA
September
Weather in September
September, the first month of the autumn in Tonasket, is still a pleasant month, with an average temperature varying between 70.9°F (21.6°C) and 47.3°F (8.5°C).Temperature
The start of September signals a decrease in the average high-temperature, transitioning from a warm 82.4°F (28°C) in August to an agreeable 70.9°F (21.6°C). Tonasket anticipates a considerable drop in temperature at night in September, with an average low of 47.3°F (8.5°C).Humidity
In Tonasket, Washington, the average relative humidity in September is 52%.Rainfall
In Tonasket, in September, during 5.3 rainfall days, 0.51" (13mm) of precipitation is typically accumulated. Throughout the year, there are 90.2 rainfall days, and 7.56" (192mm) of precipitation is accumulated.Snowfall
In Tonasket, snow does not fall in May through October.Daylight
In Tonasket, the average length of the day in September is 12h and 34min.On the first day of September, sunrise is at 6:16 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:37 pm PDT.
Sunshine
In Tonasket, the average sunshine in September is 10.8h.UV index
The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.Note: A daily high UV index of 4 in September leads to these guidelines:
Put precautions into practice - Ensuring skin and eye safety is a necessity. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Tonasket, WA
- Average high temperature in September: 70.9°F
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is December (30.4°F).
- Average low temperature in September: 47.3°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (18.1°F).
Average pressure in September
Tonasket, WA
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Tonasket, WA
- Average wind speed in September: 4.7mph
The windiest month (with the highest average wind speed) is April (5.1mph).
The calmest month (with the lowest average wind speed) is January (4mph).
Average humidity in September
Tonasket, WA
- Average humidity in September: 52%
The month with the highest relative humidity is January (91%).
The months with the lowest relative humidity are July and August (42%).
Average rainfall in September
Tonasket, WA
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is December (0.94").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in September
Tonasket, WA
- Average rainfall days in September: 5.3 days
The month with the highest number of rainy days is March (11.5 days).
The month with the least rainy days is August (2.8 days).
Average snowfall in September
Tonasket, WA
- Average snowfall in September: 0"
The month with the highest snowfall is January (3.39").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Tonasket, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (8.4 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Tonasket, WA
- Average daylight in September: 12h and 36min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 10h and 48min
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 30min).
Average sunshine days in September
Tonasket, WA
- Average sunshine days in September: 23.4 days
The month with the most sunshine days is August (26.3 days).
The month with the least sunshine days is November (15.4 days).
Average UV index in September
Tonasket, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is November (UV index 1).
Average cloud cover in September
Tonasket, WA
- Average cloud cover in September: 18
The month with the most cloud cover is January (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Tonasket, WA
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
