September weather forecast and climate
Chula Vista, CA

Wood and rope barriers at sunset on the waterfront of Bayside Park in Chula Vista, San Diego Bay, California
Wood and rope barriers at sunset on the waterfront of Bayside Park in Chula Vista, San Diego Bay, California

Weather in September

September, the first month of the autumn, in Chula Vista, is still a warm month, with temperature in the range of an average low of 65.5°F (18.6°C) and an average high of 78.3°F (25.7°C).

Temperature

In Chula Vista, the average high-temperature is relatively the same as in August - a still moderately hot 78.3°F (25.7°C). The average low-temperature, in September, is 65.5°F (18.6°C).

Humidity

The average relative humidity in Chula Vista, California, is 66%.

Rainfall

In September, the rain falls for 3.5 days. Throughout September, 0.28" (7mm) of precipitation is accumulated. In Chula Vista, California, during the entire year, the rain falls for 51 days and collects up to 5.63" (143mm) of precipitation.

Ocean temperature

In September, the average ocean temperature in Chula Vista 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 September, the average length of the day in Chula Vista is 12.4h.

Sunshine

In September, the average sunshine is 10.3h.

UV index

Months with the highest UV index in Chula Vista are June through September, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents 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 utilize sun safety practices. Protection against the skin and eye damage is required. 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 Chula Vista?

In Chula Vista, in September, the average high-temperature is 78.3°F (25.7°C), and the average low-temperature is 65.5°F (18.6°C).

What is the average humidity in September in Chula Vista?

In September, the average relative humidity in Chula Vista is 66%.

How much does it rain in Chula Vista in September?

In Chula Vista, California, in September, it is raining for 3.5 days, with typically 0.28" (7mm) of accumulated precipitation.

What is the ocean temperature in September in Chula Vista?

In Chula Vista, the average seawater temperature in September is 66.7°F (19.3°C). For most, swimming in 66.7°F (19.3°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in September in Chula Vista?

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

How long on average sun shines in September in Chula Vista?

In September, the average sunshine in Chula Vista, California, is 10.3h.

What is the month with the highest UV index in Chula Vista?

June through September, with an average maximum UV index of 6, are months with the highest UV index in Chula Vista.

What is the UV index reading in September in Chula Vista?

In Chula Vista, California, the average daily maximum UV index in September is 6. A UV Index value of 6 to 7 symbolizes a high health risk from unsafe exposure to the Sun's UV rays.

Average temperature in September
Chula Vista, CA

Average temperature in September - Chula Vista, CA
  • Average high temperature in September: 78.3°F

The warmest month (with the highest average high temperature) is August (79.2°F).
The month with the lowest average high temperature is December (63.7°F).

  • Average low temperature in September: 65.5°F

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is February (51.1°F).

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Average pressure in September
Chula Vista, CA

Average pressure in September - Chula Vista, 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
Chula Vista, CA

Average wind speed in September - Chula Vista, CA
  • Average wind speed in September: 5.2mph

The windiest month (with the highest average wind speed) is April (6.2mph).
The calmest month (with the lowest average wind speed) is October (5mph).

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Average humidity in September
Chula Vista, CA

Average humidity in September - Chula Vista, CA
  • Average humidity in September: 66%

The month with the highest relative humidity is June (71%).
The month with the lowest relative humidity is November (58%).

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Average rainfall in September
Chula Vista, CA

Average rainfall in September - Chula Vista, CA
  • Average rainfall in September: 0.28"

The wettest month (with the highest rainfall) is February (1.1").
The driest month (with the least rainfall) is June (0.08").

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Average rainfall days in September
Chula Vista, CA

Average rainfall days in September - Chula Vista, CA
  • Average rainfall days in September: 3.5 days

The month with the highest number of rainy days is March (7.2 days).
The month with the least rainy days is June (1.7 days).

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Average sea temperature in September
Chula Vista, CA

Average sea temperature in September - Chula Vista, 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
Chula Vista, CA

Average daylight in September / Average sunshine in September - Chula Vista, 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

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

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Average sunshine days in September
Chula Vista, CA

Average sunshine days in September - Chula Vista, CA
  • Average sunshine days in September: 24.8 days

The month with the most sunshine days is June (27.2 days).
The month with the least sunshine days is February (21.1 days).

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Average UV index in September
Chula Vista, CA

Average UV index in September - Chula Vista, 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, March, November and December (UV index 4).

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Average cloud cover in September
Chula Vista, CA

Average cloud cover in September - Chula Vista, CA
  • Average cloud cover in September: 12

Months with the most cloud cover are March and December (Cloud cover 23).
The month with the least cloud cover is August (Cloud cover 8).

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Average visibility in September
Chula Vista, CA

Average visibility in September - Chula Vista, 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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