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 coincides with a small decrease in the average high-temperature, down to a still warm 79.3°F (26.3°C) from a moderately hot 85.3°F (29.6°C). Mountain Mesa records a significant temperature drop in September nights, lowering to an average of 54.5°F (12.5°C).Humidity
In September, the average relative humidity is 35%.Rainfall
In Mountain Mesa, in September, during 3.4 rainfall days, 0.24" (6mm) of precipitation is typically accumulated. In Mountain Mesa, during the entire year, the rain falls for 65.1 days and collects up to 12.28" (312mm) of precipitation.Snowfall
In Mountain Mesa, snow does not fall in June through October.Daylight
In September, the average length of the day is 12h and 23min.On the first day of September, sunrise is at 6:26 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:38 pm PDT.
Sunshine
The average sunshine in September in Mountain Mesa is 10.9h.UV index
In September, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 5 in September interprets into the following advice:
Guard yourself - Precautionary measures against sun damage are advocated. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
How many hours of daylight does Mountain Mesa have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Mountain Mesa have in September?
What is the UV index reading in September?
Average temperature in September
Mountain Mesa, CA
- Average high temperature in September: 79.3°F
The warmest month (with the highest average high temperature) is July (86.4°F).
The month with the lowest average high temperature is December (49.3°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is December (32.4°F).
Average pressure in September
Mountain Mesa, CA
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in September
Mountain Mesa, CA
- Average wind speed in September: 5.4mph
The windiest month (with the highest average wind speed) is May (7.4mph).
The calmest month (with the lowest average wind speed) is September (5.4mph).
Average humidity in September
Mountain Mesa, CA
- Average humidity in September: 35%
The month with the highest relative humidity is February (61%).
The month with the lowest relative humidity is August (31%).
Average rainfall in September
Mountain Mesa, CA
- Average rainfall in September: 0.24"
The wettest month (with the highest rainfall) is January (2.24").
The driest month (with the least rainfall) is June (0.2").
Average rainfall days in September
Mountain Mesa, CA
- Average rainfall days in September: 3.4 days
The month with the highest number of rainy days is March (10.1 days).
The month with the least rainy days is June (1.5 days).
Average snowfall in September
Mountain Mesa, CA
- Average snowfall in September: 0"
The month with the highest snowfall is February (3.98").
The months with the least snowfall are June, July, August, September and October (0").
Average snowfall days in September
Mountain Mesa, CA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.7 days).
The months with the least snowfall days are June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Mountain Mesa, CA
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 30min).
The month with the shortest days is December (Average daylight: 9h and 48min).
- Average sunshine in September: 10h and 5min
The months with the most sunshine are June and July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and February (Average sunshine: 6h and 24min).
Average sunshine days in September
Mountain Mesa, CA
- Average sunshine days in September: 25.9 days
The month with the most sunshine days is June (27.4 days).
The month with the least sunshine days is February (19.2 days).
Average UV index in September
Mountain Mesa, CA
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are November and December (UV index 2).
Average cloud cover in September
Mountain Mesa, CA
- Average cloud cover in September: 6
The month with the most cloud cover is March (Cloud cover 31).
The months with the least cloud cover are August and September (Cloud cover 6).
Average visibility in September
Mountain Mesa, CA
- 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).
Mountain Mesa, California, USA
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