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 onset of September in Kennewick, Washington, is marked by a decrease in temperature, transitioning from a tropical 89.2°F (31.8°C) in August to a warm 77.9°F (25.5°C). The nighttime temperature dips to a mild 57°F (13.9°C) on average during September.Humidity
In September, the average relative humidity is 43%.Rainfall
In September, the rain falls for 4.6 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. Throughout the year, in Kennewick, there are 102.8 rainfall days, and 7.32" (186mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Kennewick.Daylight
In Kennewick, Washington, the average length of the day in September is 12h and 31min.On the first day of September, sunrise is at 6:18 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 6:37 pm PDT.
Sunshine
In Kennewick, the average sunshine in September is 10.7h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: An average maximum UV index of 5 in September leads to these recommendations:
Prioritize safety - Suggestions to prevent sun damage are offered. To guard against the harmful effects of the Sun, minimize exposure during midday. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What are September temperatures in Kennewick?
What is the average humidity in September in Kennewick?
How many days does it rain in September in Kennewick?
When it does not snow in Kennewick?
How many hours of daylight does Kennewick have in September?
When are sunrise and sunset in September in Kennewick?
How long on average sun shines in September in Kennewick?
What is the UV index reading in September in Kennewick?
Average temperature in September
Kennewick, WA
- Average high temperature in September: 77.9°F
The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is December (38.3°F).
- Average low temperature in September: 57°F
The month with the highest average low temperature is August (64°F).
The coldest month (with the lowest average low temperature) is December (27.9°F).
Average pressure in September
Kennewick, WA
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is August (29.91"Hg).
Average wind speed in September
Kennewick, WA
- Average wind speed in September: 6.7mph
The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity in September
Kennewick, WA
- Average humidity in September: 43%
The month with the highest relative humidity is January (80%).
The month with the lowest relative humidity is July (35%).
Average rainfall in September
Kennewick, WA
- Average rainfall in September: 0.24"
The wettest months (with the highest rainfall) are March and December (0.94").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Kennewick, WA
- Average rainfall days in September: 4.6 days
The month with the highest number of rainy days is March (13.3 days).
The month with the least rainy days is July (3.5 days).
Average snowfall in September
Kennewick, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.2").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Kennewick, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is December (3.1 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
Kennewick, 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: 10h and 4min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).
Average sunshine days in September
Kennewick, WA
- Average sunshine days in September: 24 days
The month with the most sunshine days is July (25.7 days).
The month with the least sunshine days is March (15.4 days).
Average UV index in September
Kennewick, WA
- Average UV index in September: 5
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
Kennewick, WA
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Kennewick, WA
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Kennewick, Washington, USA
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