September weather forecastChula Vista, CA
September
Weather in September
September ushers Chula Vista into the autumn season with gradually declining temperatures. Compared to the city's scorching summer months, September's milder weather offers pleasant outdoor possibilities. Rainfall is relatively low at 0.28" (7mm), and skies remain largely clear. The city fashions a unique blend of lingering summer warmth, slowly folding into the cool embrace of autumn. Transitioning into this season, September carries a unique character, marking the beginnings of serene and quieter days.Temperature
With the arrival of September, Chula Vista's average high-temperature registers at a still moderately hot 78.3°F (25.7°C), indicating a subtle variation from the previous month. In Chula Vista, September's nights observe an average temperature dip to an enjoyable 65.5°F (18.6°C).Humidity
In September, the average relative humidity is 66%.Rainfall
In Chula Vista, in September, during 3.5 rainfall days, 0.28" (7mm) of precipitation is typically 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 Chula Vista, in September, the average water temperature is 66.7°F (19.3°C).Note: Swimming becomes less enjoyable for most at a surface water temperature of 66.7°F (19.3°C). As the temperature decreases below 69.8°F (21°C), breathing becomes increasingly difficult.
Daylight
In September, the average length of the day in Chula Vista, California, is 12h and 22min.On the first day of September in Chula Vista, California, sunrise is at 6:23 am and sunset at 7:12 pm. On the last day of the month, sunrise is at 6:42 am and sunset at 6:33 pm PDT.
Sunshine
In September, the average sunshine in Chula Vista is 10.3h.UV index
The months with the highest UV index in Chula Vista are June through September, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 6 in September interprets into the following recommendations:
Endorse precautions and be consistent with sun safety guidelines. Preventing sunburn is paramount. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
Average pressure in September
Chula Vista, CA
- Average pressure in September: 29.88"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are June and September (29.88"Hg).
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).
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%).
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").
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).
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).
Average daylight in September /
Average sunshine in September
Chula Vista, CA
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 18min).
The month with the shortest days is December (Average daylight: 10h and 0min).
- Average sunshine in September: 10h and 18min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
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).
Average UV index in September
Chula Vista, CA
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 4).
Average cloud cover in September
Chula Vista, CA
- Average cloud cover in September: 12
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 8).
Average visibility in September
Chula Vista, 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).
