September weather forecast
Corona, CA

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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 hot month, with an average temperature ranging between max 86.9°F (30.5°C) and min 63.5°F (17.5°C).

Temperature

With September's advent, Corona sees an average high-temperature of a still tropical 86.9°F (30.5°C), subtly shifted from August's 89.4°F (31.9°C). September's nights in Corona exhibit a sharp contrast from day highs, with an average temperature of 63.5°F (17.5°C).

Heat index

September's average heat index is estimated at a tropical 89.6°F (32°C). Remaining active during long-lasting exposure could cause fatigue, leading to heat cramps.
It is emphasized that the heat index's values are meant for shaded zones with mild winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'feels like', offers an insight into how hot it feels when we factor in moisture content. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. When in direct sunlight, one should be cautious as it can raise the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Young ones are generally more prone to risk than adults due to their reduced ability to sweat. Their large skin surface area relative to their diminutive bodies and elevated heat production from their activities further enhance this risk.

Humidity

The average relative humidity in September in Corona is 49%.

Rainfall

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

Daylight

In Corona, the average length of the day in September is 12h and 22min.
On the first day of September, sunrise is at 6:24 am and sunset at 7:15 pm. On the last day of the month, sunrise is at 6:44 am and sunset at 6:35 pm PDT.

Sunshine

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

UV index

The average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: During September, 6 as the daily maximum UV index converts into the following advice:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. Limit direct sun exposure and seek shade between 10 a.m. and 4 p.m., the time of the most intense UV radiation, noting that shade structures may not provide total sun protection. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
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Frequently asked questions

How hot does it get in Corona in September?

The high-temperature, in September, in Corona, records 86.9°F (30.5°C), while the low-temperature is 63.5°F (17.5°C). In September, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 89.6°F (32°C).

What is the average humidity in September in Corona?

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

How many days does it rain in September in Corona?

In Corona, California, in September, it is raining for 2.5 days, with typically 0.12" (3mm) of accumulated precipitation.

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

In Corona, California, the average day length in September is 12h and 22min.

When are sunrise and sunset in September in Corona?

In September, on the first day of the month, sunrise is at 6:24 am and sunset at 7:15 pm. On the last day of the month, in Corona, California, sunrise is at 6:44 am and sunset at 6:35 pm PDT.

How many hours of sunshine does Corona have in September?

The average sunshine duration in September is 10.6h.

What is the UV index reading in September in Corona?

In September, the average daily maximum UV index in Corona is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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"Hg

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

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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: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).

  • Average sunshine in September: 10h and 4min

The months with the most sunshine are July and August (Average sunshine: 12h and 6min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).

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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

The months with the highest UV index are July and August (UV index 7).
The 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

The 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

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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Corona, California, USA

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