Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
A minor adjustment in La Jolla's average high-temperature is noted with the start of September, touching a still moderately hot 78.6°F (25.9°C) from August's 79.3°F (26.3°C). The mean low-temperature during September nights is a refreshing 64.4°F (18°C).Humidity
In September, the average relative humidity is 65%.Rainfall
In La Jolla, in September, it is raining for 4.2 days, with typically 0.31" (8mm) of accumulated precipitation. In La Jolla, during the entire year, the rain falls for 57.9 days and collects up to 7.48" (190mm) of precipitation.Ocean temperature
In La Jolla, the average seawater temperature in September is 66.7°F (19.3°C).Note: Swimming in water at 66.7°F (19.3°C) is not a pleasurable experience for most. The task of managing breathing becomes more challenging as the water temperature descends from 69.8°F (21°C) to 59°F (15°C).
Daylight
In September, the average length of the day in La Jolla, California, is 12h and 22min.On the first day of the month, sunrise is at 6:24 am and sunset at 7:13 pm. On the last day of September, in La Jolla, sunrise is at 6:43 am and sunset at 6:34 pm PDT.
Sunshine
In La Jolla, the average sunshine in September is 10.3h.UV index
The months with the highest UV index in La Jolla are July through September, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.Note: The daily maximum UV index of 6 in September interprets into the following advice:
Fend off overexposure. Sun protection is vital. 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. Boost your sun resistance with garments that are densely woven yet spacious.
Frequently asked questions
What are the temperatures in La Jolla in September?
What is the average humidity in September in La Jolla?
How much does it rain in La Jolla in September?
How cold is the water in September in La Jolla?
How many hours of daylight does La Jolla have in September?
What time are sunrise and sunset in September in La Jolla?
How long on average sun shines in September in La Jolla?
What is the month with the highest UV index in La Jolla?
What is the UV index intensity in September in La Jolla?
Average temperature in September
La Jolla, CA
- Average high temperature in September: 78.6°F
The warmest month (with the highest average high temperature) is August (79.3°F).
The month with the lowest average high temperature is December (63.5°F).
- Average low temperature in September: 64.4°F
The month with the highest average low temperature is August (65.8°F).
The coldest month (with the lowest average low temperature) is February (50.2°F).
Average pressure in September
La Jolla, 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
La Jolla, CA
- Average wind speed in September: 5mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is October (4.8mph).
Average humidity in September
La Jolla, CA
- Average humidity in September: 65%
The months with the highest relative humidity are May and June (71%).
The month with the lowest relative humidity is November (57%).
Average rainfall in September
La Jolla, CA
- Average rainfall in September: 0.31"
The wettest month (with the highest rainfall) is February (1.46").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in September
La Jolla, CA
- Average rainfall days in September: 4.2 days
The month with the highest number of rainy days is March (7.1 days).
The month with the least rainy days is June (2.2 days).
Average sea temperature in September
La Jolla, 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
La Jolla, CA
- Average daylight in September: 12h and 2min
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 2min
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 48min).
Average sunshine days in September
La Jolla, CA
- Average sunshine days in September: 22.4 days
The month with the most sunshine days is January (24.8 days).
The month with the least sunshine days is February (20.2 days).
Average UV index in September
La Jolla, CA
- Average UV index in September: 6
The months with the highest UV index are 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
La Jolla, CA
- Average cloud cover in September: 11
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
La Jolla, 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).
La Jolla, California, USA
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