September weather forecastZillah, WA
September
Weather in September
September, the first month of the autumn in Zillah, is still a warm month, with an average temperature fluctuating between 75.6°F (24.2°C) and 54.3°F (12.4°C).Temperature
The commencement of September involves a temperature shift, with the average high-temperature dropping from a tropical 86.2°F (30.1°C) in August to a moderately hot 75.6°F (24.2°C). September brings Zillah a consistent average low-temperature of 54.3°F (12.4°C).Humidity
In September, the average relative humidity is 47%.Rainfall
In Zillah, Washington, during September, the rain falls for 4.9 days and regularly aggregates up to 0.31" (8mm) of precipitation. Throughout the year, there are 98.5 rainfall days, and 6.97" (177mm) of precipitation is accumulated.Snowfall
Months with snowfall in Zillah are January through March, September, November and December. September is the first month it typically snows in Zillah. Throughout September, in the average 0.1 snowfall days, it receives 0.16" (4mm) of snow. In Zillah, during the entire year, snow falls for 17.1 days and aggregates up to 6.69" (170mm) of snow.Daylight
In Zillah, Washington, the average length of the day in September is 12h and 32min.On the first day of the month, sunrise is at 6:22 am and sunset at 7:39 pm. On the last day of September, sunrise is at 6:59 am and sunset at 6:42 pm PDT.
Sunshine
In Zillah, the average sunshine in September is 11.1h.UV index
The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Prioritize safety - Suggestions to prevent sun damage are offered. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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
Zillah, 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).
