September weather forecast and climate
Coronado, CA

Weather in September

September, the first month of the autumn, in Coronado, is also a moderately hot month, with average temperature ranging between max 75.2°F (24°C) and min 65.3°F (18.5°C).

Temperature

In Coronado, the average high-temperature in September is almost the same as in August - a still moderately hot 75.2°F (24°C). In Coronado, California, the average low-temperature is 65.3°F (18.5°C).

Humidity

The average relative humidity in September is 70%.

Rainfall

In September, the rain falls for 3.7 days. Throughout September, 0.31" (8mm) of precipitation is accumulated. Throughout the year, in Coronado, there are 64.5 rainfall days, and 9.02" (229mm) of precipitation is accumulated.

Ocean temperature

In September, the average ocean temperature is 66.7°F (19.3°C).
Note: Swimming in 66.7°F (19.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

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

Sunshine

In Coronado, the average sunshine is 10.3h.

UV index

Months with the highest UV index in Coronado are July through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to the Sun's UV rays for ordinary 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. 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 Coronado?

The average high-temperature, in September, is 75.2°F (24°C), while the average low-temperature is 65.3°F (18.5°C).

What is the average humidity in September in Coronado?

In September, the average relative humidity is 70%.

How many days does it rain in September in Coronado?

In Coronado, during September, the rain falls for 3.7 days and regularly aggregates up to 0.31" (8mm) of precipitation.

What is the ocean temperature in September in Coronado?

In September, the average ocean temperature in Coronado, California, is 66.7°F (19.3°C). Swimming in 66.7°F (19.3°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

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

How many hours of sunshine does Coronado have in September?

In Coronado, the average sunshine in September is 10.3h.

What are the months with the highest UV index in Coronado?

July through September, with an average maximum UV index of 6, are months with the highest UV index in Coronado, California.

How high is the UV index in September in Coronado?

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

Average temperature in September
Coronado, CA

Average temperature in September - Coronado, CA
  • Average high temperature in September: 75.2°F

The warmest month (with the highest average high temperature) is August (75.6°F).
Months with the lowest average high temperature are February and December (63°F).

  • Average low temperature in September: 65.3°F

The month with the highest average low temperature is August (65.5°F).
The coldest month (with the lowest average low temperature) is February (53.1°F).

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Average pressure in September
Coronado, CA

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

The month with the highest atmospheric pressure is January (30.09").
Months with the lowest atmospheric pressure are June and September (29.88").

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Average wind speed in September
Coronado, CA

Average wind speed in September - Coronado, CA
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest month (with the lowest average wind speed) is October (5.5mph).

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Average humidity in September
Coronado, CA

Average humidity in September - Coronado, CA
  • Average humidity in September: 70%

The month with the highest relative humidity is June (76%).
Months with the lowest relative humidity are January and November (61%).

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Average rainfall in September
Coronado, CA

Average rainfall in September - Coronado, CA
  • Average rainfall in September: 0.31"

The wettest month (with the highest rainfall) is December (1.81").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Coronado, CA

Average rainfall days in September - Coronado, CA
  • Average rainfall days in September: 3.7 days

The month with the highest number of rainy days is March (8.4 days).
The month with the least rainy days is June (2.8 days).

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Average sea temperature in September
Coronado, CA

Average sea temperature in September - Coronado, CA
  • Average sea temperature in September: 66.7°F

The best month for swimming (with the highest average sea temperature) is August (67.9°F).
The coldest month (with the lowest average sea temperature) is February (58.7°F).

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

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

The month with the longest days is June (Average daylight: 14.3h).
The month with the shortest days is December (Average daylight: 10h).

  • Average sunshine in September: 10.3h

Months with the most sunshine are July and August (Average sunshine: 11.9h).
The month with the least sunshine is December (Average sunshine: 6.7h).

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Average sunshine days in September
Coronado, CA

Average sunshine days in September - Coronado, CA
  • Average sunshine days in September: 23.9 days

The month with the most sunshine days is August (24.8 days).
The month with the least sunshine days is February (20.1 days).

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Average UV index in September
Coronado, CA

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

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

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Average cloud cover in September
Coronado, CA

Average cloud cover in September - Coronado, CA
  • Average cloud cover in September: 12

Months with the most cloud cover are March, May and December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).

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Average visibility in September
Coronado, CA

Average visibility in September - Coronado, 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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