September weather forecast
Mountain Mesa, CA

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Weather in September

The first month of the autumn, September, is still a warm month in Mountain Mesa, California, with an average temperature fluctuating between 54.5°F (12.5°C) and 79.3°F (26.3°C).

Temperature

The onset of September aligns with a soft reduction in the average high-temperature, gently falling from a moderately hot 85.3°F (29.6°C) in August to a still warm 79.3°F (26.3°C). Mountain Mesa records a pronounced decline from the day's peak to an average nighttime low-temperature of 54.5°F (12.5°C) throughout September.

Humidity

In Mountain Mesa, the average relative humidity in September is 35%.

Rainfall

In Mountain Mesa, during September, the rain falls for 3.4 days and regularly aggregates up to 0.24" (6mm) of precipitation. 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 Mountain Mesa, the average length of the day in September 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

In Mountain Mesa, the average sunshine in September is 10.9h.

UV index

In Mountain Mesa, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for the average person.
Note: An average maximum UV index of 5 in September leads to these recommendations:
Undertake precautions - Guarding against sun damage is counselled. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
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Frequently asked questions

What is the average September temperature in Mountain Mesa?

The average high-temperature and low-temperature during September are 79.3°F (26.3°C) and 54.5°F (12.5°C) respectively.

What is the average humidity in September in Mountain Mesa?

In Mountain Mesa, California, the average relative humidity in September is 35%.

How many days does it rain in September in Mountain Mesa?

In Mountain Mesa, in September, it is raining for 3.4 days, with typically 0.24" (6mm) of accumulated precipitation.

When it does not snow in Mountain Mesa?

June through October are months without snowfall in Mountain Mesa.

What is the average length of the day in September in Mountain Mesa?

In Mountain Mesa, California, the average day length in September is 12h and 23min.

When is the sunrise / sunset in September in Mountain Mesa?

In September, on the first day of the month, sunrise is at 6:26 am and sunset at 7:20 pm. On the last day of the month, in Mountain Mesa, sunrise is at 6:48 am and sunset at 6:38 pm PDT.

How many hours of sunshine does Mountain Mesa have in September?

In September, the average sunshine duration is 10.9h.

What is the UV index intensity in September in Mountain Mesa?

In Mountain Mesa, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Mountain Mesa, CA

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).

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Average pressure in September
Mountain Mesa, CA

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).

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Average wind speed in September
Mountain Mesa, CA

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).

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Average humidity in September
Mountain Mesa, CA

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%).

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Average rainfall in September
Mountain Mesa, CA

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").

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Average rainfall days in September
Mountain Mesa, CA

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).

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Average snowfall in September
Mountain Mesa, CA

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").

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Average snowfall days in September
Mountain Mesa, CA

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).

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Average daylight in September /
Average sunshine in September
Mountain Mesa, CA

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).

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Average sunshine days in September
Mountain Mesa, CA

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).

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Average UV index in September
Mountain Mesa, CA

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).

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Average cloud cover in September
Mountain Mesa, CA

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).

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Average visibility in September
Mountain Mesa, CA

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).

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Mountain Mesa, California, USA

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