September weather forecast and climate
Santa Ana, CA

Night lights of the street in Santa Ana, California, with palm trees lining the street
Night lights of the street in Santa Ana, California, with palm trees lining the street

Weather in September

The first month of the autumn, September, is also a moderately hot month in Santa Ana, California, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 64.2°F (17.9°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a still moderately hot 81.7°F (27.6°C). In Santa Ana, in September, the average low-temperature is 64.2°F (17.9°C).

Heat index

The average heat index is appraised at 83.8°F (28.8°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Note that heat index values are valued for light wind and location in the shade. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature', 'felt air temperature', 'feels like', or 'real feel', is a calculated temperature value of how hot it feels when the moisture in the air is factored in. Additional factors like wind, metabolic differences, differences in body mass, height, and shape, and activity influence one's weather impression. 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 59%.

Rainfall

In Santa Ana, during September, the rain falls for 3.7 days and regularly aggregates up to 0.24" (6mm) of precipitation. Throughout the year, in Santa Ana, there are 55 rainfall days, and 7.4" (188mm) of precipitation is accumulated.

Daylight

In Santa Ana, the average length of the day is 12.4h.

Sunshine

The average sunshine in Santa Ana is 10.6h.

UV index

June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Santa Ana?

In September, in Santa Ana, California, the average high-temperature is 81.7°F (27.6°C), and the average low-temperature is 64.2°F (17.9°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), that combines both air temperature and relative humidity, in September is appraised at 83.8°F (28.8°C).

What is the average humidity in September in Santa Ana?

In September, the average relative humidity in Santa Ana, California, is 59%.

How many days does it rain in September in Santa Ana?

In Santa Ana, California, in September, during 3.7 rainfall days, 0.24" (6mm) of precipitation is typically accumulated.

What is the average length of the day in September in Santa Ana?

The average length of the day in September in Santa Ana, California, is 12.4h.

How many hours of sunshine does Santa Ana have in September?

In Santa Ana, the average sunshine in September is 10.6h.

What is the month with the highest UV index in Santa Ana?

Months with the highest UV index in Santa Ana are June through September, with an average maximum UV index of 6.

What is the UV index reading in September in Santa Ana?

In September, the average daily maximum UV index in Santa Ana, California, is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in September
Santa Ana, CA

Average temperature in September - Santa Ana, CA
  • Average high temperature in September: 81.7°F

The warmest month (with the highest average high temperature) is August (83.1°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in September: 64.2°F

The month with the highest average low temperature is August (64.9°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).

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Average pressure in September
Santa Ana, CA

Average pressure in September - Santa Ana, CA
  • Average pressure in September: 29.89"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.88").

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Average wind speed in September
Santa Ana, CA

Average wind speed in September - Santa Ana, CA
  • Average wind speed in September: 4.6mph

The windiest month (with the highest average wind speed) is April (5.9mph).
The calmest month (with the lowest average wind speed) is September (4.6mph).

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Average humidity in September
Santa Ana, CA

Average humidity in September - Santa Ana, CA
  • Average humidity in September: 59%

The month with the highest relative humidity is June (66%).
The month with the lowest relative humidity is November (52%).

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Average rainfall in September
Santa Ana, CA

Average rainfall in September - Santa Ana, CA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is December (1.54").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Santa Ana, CA

Average rainfall days in September - Santa Ana, CA
  • Average rainfall days in September: 3.7 days

The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (1.7 days).

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Average daylight in September /
Average sunshine in September
Santa Ana, CA

Average daylight in September / Average sunshine in September - Santa Ana, 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: 9.9h).

  • Average sunshine in September: 10.6h

Months with the most sunshine are July and August (Average sunshine: 12h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Santa Ana, CA

Average sunshine days in September - Santa Ana, CA
  • Average sunshine days in September: 22.8 days

The month with the most sunshine days is January (25 days).
The month with the least sunshine days is February (20.8 days).

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Average UV index in September
Santa Ana, CA

Average UV index in September - Santa Ana, CA
  • Average UV index in September: 6

Months with the highest UV index are June, July, August and September (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in September
Santa Ana, CA

Average cloud cover in September - Santa Ana, CA
  • Average cloud cover in September: 9

The month with the most cloud cover is December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 5).

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Average visibility in September
Santa Ana, CA

Average visibility in September - Santa Ana, 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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