September weather forecast
Corona, CA

Colorful beach homes along the Pacific Ocean facing the calm turquoise-blue ocean water in Corona del Mar, California
Colorful beach homes along the Pacific Ocean facing the calm turquoise-blue ocean water in Corona del Mar, California

Weather in September

September, the first month of the autumn, in Corona, is still a tropical month, with average temperature ranging between max 86.9°F (30.5°C) and min 63.5°F (17.5°C).

Temperature

In September, the average high-temperature is practically the same as in August - a still tropical 86.9°F (30.5°C). In Corona, in September, the average low-temperature is 63.5°F (17.5°C).

Heat index

In September, the average heat index is evaluated at a hot 88.9°F (31.6°C). Exhaustion is likely with prolonged exposure and activity. Sustaining activity may result in heat cramps.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is a measure that combines air temperature and relative humidity into a single value that indicates how hot the weather feels. Additional factors like differences in body mass, height, and shape, clothing, pregnancy, 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 especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.

Humidity

The average relative humidity in September is 49%.

Rainfall

In Corona, during September, the rain falls for 2.5 days and regularly aggregates up to 0.12" (3mm) of precipitation. Throughout the year, in Corona, there are 53.9 rainfall days, and 8.86" (225mm) of precipitation is accumulated.

Daylight

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

Sunshine

In September, the average sunshine is 10.6h.

UV index

In Corona, the average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health hazard from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Corona?

The average high-temperature, in September, in Corona, is 86.9°F (30.5°C), while the average low-temperature is 63.5°F (17.5°C). The average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in September is evaluated at 88.9°F (31.6°C).

What is the average humidity in September in Corona?

In September, the average relative humidity in Corona, California, is 49%.

How much does it rain in Corona in September?

In Corona, during September, the rain falls for 2.5 days and regularly aggregates up to 0.12" (3mm) of precipitation.

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

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

How long on average sun shines in September in Corona?

In September, the average sunshine in Corona is 10.6h.

What is the UV index intensity in September in Corona?

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high hazard to health from the exposure to the Sun's UV rays.

Average temperature in September
Corona, CA

Average temperature in September - Corona, CA
  • Average high temperature in September: 86.9°F

The warmest month (with the highest average high temperature) is August (89.4°F).
The month with the lowest average high temperature is December (63.5°F).

  • Average low temperature in September: 63.5°F

The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is December (46.9°F).

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Average pressure in September
Corona, CA

Average pressure in September - Corona, CA
  • Average pressure in September: 29.88"

The month with the highest atmospheric pressure is January (30.1").
The month with the lowest atmospheric pressure is June (29.87").

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Average wind speed in September
Corona, CA

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

The windiest months (with the highest average wind speed) are April and May (5.4mph).
The calmest month (with the lowest average wind speed) is September (4.3mph).

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Average humidity in September
Corona, CA

Average humidity in September - Corona, CA
  • Average humidity in September: 49%

The month with the highest relative humidity is May (60%).
The month with the lowest relative humidity is November (48%).

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Average rainfall in September
Corona, CA

Average rainfall in September - Corona, CA
  • Average rainfall in September: 0.12"

The wettest month (with the highest rainfall) is December (1.89").
The driest month (with the least rainfall) is June (0.04").

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Average rainfall days in September
Corona, CA

Average rainfall days in September - Corona, CA
  • Average rainfall days in September: 2.5 days

The month with the highest number of rainy days is March (8.2 days).
The month with the least rainy days is June (1.3 days).

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

Average daylight in September / Average sunshine in September - Corona, 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: 12.1h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Corona, CA

Average sunshine days in September - Corona, CA
  • Average sunshine days in September: 24.5 days

The month with the most sunshine days is June (27.1 days).
The month with the least sunshine days is February (20.8 days).

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Average UV index in September
Corona, CA

Average UV index in September - Corona, CA
  • Average UV index in September: 6

Months with the highest UV index are July and August (UV index 7).
Months with the lowest UV index are January, February, November and December (UV index 4).

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Average cloud cover in September
Corona, CA

Average cloud cover in September - Corona, CA
  • Average cloud cover in September: 8

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

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Average visibility in September
Corona, CA

Average visibility in September - Corona, 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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