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 shift from August to September involves a decrease in the average high-temperature, from a moderately hot 78.4°F (25.8°C) to an agreeable 69.1°F (20.6°C). The nighttime temperature during September exhibits a clear drop from daytime highs, settling at a frosty 43.3°F (6.3°C).Humidity
In Mesa, the average relative humidity in September is 50%.Rainfall
In Mesa, in September, during 7.7 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. In Mesa, Idaho, during the entire year, the rain falls for 98.1 days and collects up to 22.64" (575mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.08" (2mm) of snow. In Mesa, during the entire year, snow falls for 93.8 days and aggregates up to 104.45" (2653mm) of snow.Daylight
In September, the average length of the day is 12h and 30min.On the first day of September, sunrise is at 7:09 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 7:27 pm MDT.
Sunshine
In Mesa, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: The daily maximum UV index of 3 in September interprets into the following advice:
Be vigilant - A duty to shield skin and eyes from injury exists. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When does it start snowing?
What is the average length of the day 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?
Average temperature in September
Mesa, ID
- Average high temperature in September: 69.1°F
The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is December (28°F).
- Average low temperature in September: 43.3°F
The month with the highest average low temperature is August (50°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Mesa, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Mesa, ID
- Average wind speed in September: 4.9mph
The windiest months (with the highest average wind speed) are March and April (5.3mph).
The calmest month (with the lowest average wind speed) is January (4.2mph).
Average humidity in September
Mesa, ID
- Average humidity in September: 50%
The months with the highest relative humidity are January and February (91%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
Mesa, ID
- Average rainfall in September: 0.79"
The wettest month (with the highest rainfall) is March (3.31").
The driest month (with the least rainfall) is July (0.31").
Average rainfall days in September
Mesa, ID
- Average rainfall days in September: 7.7 days
The month with the highest number of rainy days is May (14.4 days).
The month with the least rainy days is January (4.1 days).
Average snowfall in September
Mesa, ID
- Average snowfall in September: 0.08"
The month with the highest snowfall is January (23.07").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Mesa, ID
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is March (17 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Mesa, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Mesa, ID
- Average sunshine days in September: 20.4 days
The month with the most sunshine days is July (23.8 days).
The month with the least sunshine days is March (10.1 days).
Average UV index in September
Mesa, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February and November (UV index 1).
Average cloud cover in September
Mesa, ID
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are July and August (Cloud cover 10).
Average visibility in September
Mesa, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
Mesa, Idaho, USA
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