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
As September begins, there is a decrease in the average high-temperature, falling from a hot 88.3°F (31.3°C) in August to a moderately hot 77.4°F (25.2°C). An average low-temperature of 56.3°F (13.5°C) is expected during September.Humidity
The average relative humidity in September in Mesa is 43%.Rainfall
In September, the rain falls for 4.5 days. Throughout September, 0.24" (6mm) of precipitation is accumulated. In Mesa, during the entire year, the rain falls for 97 days and collects up to 7.36" (187mm) of precipitation.Snowfall
Months with snowfall are January through March, September, November and December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.2" (5mm) of snow. In Mesa, during the entire year, snow falls for 14.2 days and aggregates up to 5.43" (138mm) of snow.Daylight
The average length of the day in September in Mesa is 12h and 32min.On the first day of the month, sunrise is at 6:17 am and sunset at 7:34 pm. On the last day of September, in Mesa, sunrise is at 6:54 am and sunset at 6:37 pm PDT.
Sunshine
In September, the average sunshine is 10.6h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Exercise prevention - Precautions against solar damage are endorsed. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Frequently asked questions
What is the temperature in September in Mesa?
What is the average humidity in September in Mesa?
How many days does it rain in September in Mesa?
When does it start to snow in Mesa?
How many hours of daylight does Mesa have in September?
When is the sunrise / sunset in September in Mesa?
How many hours of sunshine does Mesa have in September?
What is the UV index intensity in September in Mesa?
Average temperature in September
Mesa, WA
- Average high temperature in September: 77.4°F
The warmest month (with the highest average high temperature) is July (89.1°F).
The month with the lowest average high temperature is December (36.5°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is August (63.1°F).
The coldest month (with the lowest average low temperature) is December (26.2°F).
Average pressure in September
Mesa, WA
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.18"Hg).
The month with the lowest atmospheric pressure is August (29.9"Hg).
Average wind speed in September
Mesa, WA
- Average wind speed in September: 6.6mph
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
Mesa, WA
- Average humidity in September: 43%
The month with the highest relative humidity is January (82%).
The months with the lowest relative humidity are July and August (36%).
Average rainfall in September
Mesa, WA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is January (0.94").
The driest months (with the least rainfall) are July and August (0.2").
Average rainfall days in September
Mesa, WA
- Average rainfall days in September: 4.5 days
The month with the highest number of rainy days is March (12.8 days).
The month with the least rainy days is July (3.3 days).
Average snowfall in September
Mesa, WA
- Average snowfall in September: 0.2"
The month with the highest snowfall is February (1.97").
The months with the least snowfall are April, May, June, July, August and October (0").
Average snowfall days in September
Mesa, WA
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is December (4.1 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
Mesa, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in September: 10h and 4min
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: 5h and 12min).
Average sunshine days in September
Mesa, WA
- Average sunshine days in September: 24.1 days
The month with the most sunshine days is July (26.3 days).
The month with the least sunshine days is February (14.8 days).
Average UV index in September
Mesa, 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
Mesa, WA
- Average cloud cover in September: 17
The month with the most cloud cover is January (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in September
Mesa, 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).
Mesa, Washington, USA
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