September weather forecast and climate
Murrieta, CA

The dense city of Murrieta in California, with a far view of hills and snow-covered mountains
The dense city of Murrieta in California, with a far view of hills and snow-covered mountains

Weather in September

September, the first month of the autumn, in Murrieta, is also a moderately hot month, with temperature in the range of an average low of 60.4°F (15.8°C) and an average high of 85.1°F (29.5°C).

Temperature

In Murrieta, the average high-temperature in September is essentially the same as in August - a warm 85.1°F (29.5°C). In September, the average low-temperature is 60.4°F (15.8°C).

Heat index

In September, the average heat index is estimated at a tropical 87.6°F (30.9°C). Constant exposure and activity lead to possible fatigue. Prolonged exercise may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. With the exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'feels like', 'apparent temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. Additional factors like activity, wind, clothing, and differences in body mass, height, and shape affect individual temperature impact. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

The average relative humidity in September is 54%.

Rainfall

In Murrieta, in September, during 4.1 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. In Murrieta, during the entire year, the rain falls for 60.6 days and collects up to 9.37" (238mm) of precipitation.

Daylight

In September, the average length of the day in Murrieta is 12.4h.

Sunshine

In Murrieta, the average sunshine is 10.5h.

UV index

In Murrieta, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Murrieta?

In September, in Murrieta, California, the average high-temperature is 85.1°F (29.5°C), and the average low-temperature is 60.4°F (15.8°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), that combines relative humidity and air temperature, in September is evaluated at 87.6°F (30.9°C).

What is the average humidity in September in Murrieta?

In Murrieta, the average relative humidity in September is 54%.

How many days does it rain in September in Murrieta?

In September, in Murrieta, California, the rain falls for 4.1 days. Throughout September, 0.28" (7mm) of precipitation is accumulated.

What is the average length of the day in September in Murrieta?

The average length of the day in September in Murrieta is 12.4h.

How long on average sun shines in September in Murrieta?

In September, the average sunshine is 10.5h.

How high is the UV index in September in Murrieta?

In September, the average daily maximum UV index in Murrieta is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Murrieta, CA

Average temperature in September - Murrieta, CA
  • Average high temperature in September: 85.1°F

The warmest month (with the highest average high temperature) is August (87.4°F).
The month with the lowest average high temperature is December (61.7°F).

  • Average low temperature in September: 60.4°F

The month with the highest average low temperature is August (62.2°F).
The coldest month (with the lowest average low temperature) is February (43.3°F).

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Average pressure in September
Murrieta, CA

Average pressure in September - Murrieta, CA
  • Average pressure in September: 29.87"

The month with the highest atmospheric pressure is January (30.09").
The month with the lowest atmospheric pressure is June (29.86").

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Average wind speed in September
Murrieta, CA

Average wind speed in September - Murrieta, CA
  • Average wind speed in September: 4.3mph

The windiest month (with the highest average wind speed) is April (5.5mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).

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Average humidity in September
Murrieta, CA

Average humidity in September - Murrieta, CA
  • Average humidity in September: 54%

The month with the highest relative humidity is May (65%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in September
Murrieta, CA

Average rainfall in September - Murrieta, CA
  • Average rainfall in September: 0.28"

The wettest month (with the highest rainfall) is December (1.81").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Murrieta, CA

Average rainfall days in September - Murrieta, CA
  • Average rainfall days in September: 4.1 days

The month with the highest number of rainy days is March (8.2 days).
The month with the least rainy days is June (1.4 days).

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Average daylight in September /
Average sunshine in September
Murrieta, CA

Average daylight in September / Average sunshine in September - Murrieta, CA
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 14.4h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 10.5h

The month with the most sunshine is July (Average sunshine: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.5h).

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Average sunshine days in September
Murrieta, CA

Average sunshine days in September - Murrieta, CA
  • Average sunshine days in September: 24 days

The month with the most sunshine days is June (26.5 days).
The month with the least sunshine days is February (20.8 days).

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Average UV index in September
Murrieta, CA

Average UV index in September - Murrieta, CA
  • Average UV index in September: 5

Months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 3).

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Average cloud cover in September
Murrieta, CA

Average cloud cover in September - Murrieta, CA
  • Average cloud cover in September: 10

The month with the most cloud cover is March (Cloud cover 27).
The month with the least cloud cover is August (Cloud cover 7).

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Average visibility in September
Murrieta, CA

Average visibility in September - Murrieta, CA
  • Average visibility in September: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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