September weather forecastToppenish, WA
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Toppenish, Washington, with an average temperature fluctuating between 54.3°F (12.4°C) and 75.6°F (24.2°C).Temperature
Stepping into September, Toppenish observes a temperature decline, with the average high falling from August's tropical 86.2°F (30.1°C) to a moderately hot 75.6°F (24.2°C). Throughout the month of September, Toppenish observes an average nighttime temperature of 54.3°F (12.4°C).Humidity
In Toppenish, the average relative humidity in September is 47%.Rainfall
In Toppenish, in September, during 4.9 rainfall days, 0.31" (8mm) of precipitation is typically accumulated. In Toppenish, during the entire year, the rain falls for 98.5 days and collects up to 6.97" (177mm) of precipitation.Snowfall
Months with snowfall in Toppenish, Washington, are January through March, September, November and December. September is the first month it typically snows in Toppenish. Throughout September, in the average 0.1 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, in Toppenish, there are 17.1 snowfall days, and 6.69" (170mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 32min.On the first day of September in Toppenish, sunrise is at 6:22 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 6:59 am and sunset at 6:42 pm PDT.
Sunshine
The average sunshine in September in Toppenish, Washington, is 11.1h.UV index
In Toppenish, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 4 in September translates into the following instructions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Toppenish, WA
- Average high temperature in September: 75.6°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is December (36.7°F).
- Average low temperature in September: 54.3°F
The month with the highest average low temperature is August (60.8°F).
The coldest month (with the lowest average low temperature) is December (25.7°F).
Average pressure in September
Toppenish, 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
Toppenish, WA
- Average wind speed in September: 6.3mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in September
Toppenish, WA
- Average humidity in September: 47%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is July (38%).
Average rainfall in September
Toppenish, WA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is January (1.02").
The driest month (with the least rainfall) is July (0.16").
Average rainfall days in September
Toppenish, WA
- Average rainfall days in September: 4.9 days
The month with the highest number of rainy days is March (12.1 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in September
Toppenish, WA
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (2.4").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Toppenish, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (5 days).
The months with the least snowfall days are April, May, June, July, August and October (0 days).
Average daylight in September /
Average sunshine in September
Toppenish, WA
- Average daylight in September: 12h and 30min
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: 11h and 6min
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 30min).
Average sunshine days in September
Toppenish, WA
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is July (25.8 days).
The month with the least sunshine days is February (14.6 days).
Average UV index in September
Toppenish, 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
Toppenish, WA
- Average cloud cover in September: 15
The month with the most cloud cover is January (Cloud cover 42).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Toppenish, 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).
