Corona
California, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
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
The first month of the autumn, September, is still a hot month in Corona, California, 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 relatively the same as in August - a still hot 86.9°F (30.5°C). In Corona, the average low-temperature is 63.5°F (17.5°C).

Heat index

The average heat index in September is calculated to a hot 88.9°F (31.6°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 'feels like', 'apparent temperature', 'real feel', or 'felt air temperature', is calculated by taking the relative humidity value for a specific location and factoring it into the air temperature reading. Additional factors like metabolic differences, wind, 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 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 Corona is 49%.

Rainfall

In Corona, during 2.5 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, 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

The average daily maximum UV index in September is 6. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 6 in September transform into the following instructions:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. 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. 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.

What is the temperature in September in Corona?

The average high-temperature, in September, in Corona, California, 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'), that combines relative humidity and air temperature, 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, California, in September, during 2.5 rainfall days, 0.12" (3mm) of precipitation is typically accumulated.

How many hours of daylight does Corona have in September?

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

How long on average sun shines in September in Corona?

In September, the average sunshine is 10.6h.

What is the UV index reading in September in Corona?

In September, the average daily maximum UV index in Corona, California, is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
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).

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%).

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 lowest rainfall) is June (0.04").

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 lowest number of rainy days is June (1.3 days).

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 shortest days is December (Average daylight: 9.9h).

  • Average sunshine in September: 10.6h

Months with most sunshine are July and August (Average sunshine: 12.1h).
The month with least sunshine is December (Average sunshine: 6.7h).

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).