October weather forecastSan Diego, CA
October
Weather in October
October in San Diego is characterized by cooling temperatures, shorter daylight hours, and a slight increase in rainfall, measuring at 0.31" (8mm). The sea temperature deals with a significant dip, dissuading people from entering the waters. This month, residents swap shorts and flip-flops for jeans and sweatshirts. Though the weather remains pleasant with a good amount of sunshine, cooler temperatures and increased wind speeds make for beautiful, crisp fall days. Sunny afternoons and crisp nights signify the transition towards the chillier months.Temperature
With October's arrival, San Diego's weather records an average high-temperature of an agreeable 73.2°F (22.9°C), marking little difference from September's 76.6°F (24.8°C). An average low-temperature of 61.9°F (16.6°C) is common in San Diego during the nights of October.Humidity
The average relative humidity in October is 65%.Rainfall
In San Diego, in October, it is raining for 3.4 days, with typically 0.31" (8mm) of accumulated precipitation. In San Diego, during the entire year, the rain falls for 61.8 days and collects up to 8.7" (221mm) of precipitation.Ocean temperature
In San Diego, in October, the average water temperature is 65.1°F (18.4°C).Note: Swimming in 65.1°F (18.4°C) is not pleasurable for most people. Breathing control grows increasingly challenging as the water temperature falls under 69.8°F (21°C).
Daylight
The average length of the day in October in San Diego is 11h and 21min.On the first day of the month, sunrise is at 6:43 am and sunset at 6:32 pm. On the last day of October, in San Diego, sunrise is at 7:06 am and sunset at 5:58 pm PDT.
Sunshine
In San Diego, California, the average sunshine in October is 8.8h.UV index
In San Diego, California, the average daily maximum UV index in October is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 5 during October leads to these instructions:
Adopt protective measures - It is advised to guard against sun damage. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
San Diego, CA
- Average high temperature in October: 73.2°F
The warmest month (with the highest average high temperature) is August (77.4°F).
The month with the lowest average high temperature is February (63.1°F).
- Average low temperature in October: 61.9°F
The month with the highest average low temperature is August (65.7°F).
The coldest month (with the lowest average low temperature) is February (51.8°F).
Average pressure in October
San Diego, CA
- Average pressure in October: 29.93"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 October
San Diego, CA
- Average wind speed in October: 5.2mph
The windiest months (with the highest average wind speed) are April and May (6.3mph).
The calmest month (with the lowest average wind speed) is October (5.2mph).
Average humidity in October
San Diego, CA
- Average humidity in October: 65%
The month with the highest relative humidity is June (73%).
The month with the lowest relative humidity is November (59%).
Average rainfall in October
San Diego, CA
- Average rainfall in October: 0.31"
The wettest month (with the highest rainfall) is December (1.65").
The driest month (with the least rainfall) is June (0.12").
Average rainfall days in October
San Diego, CA
- Average rainfall days in October: 3.4 days
The month with the highest number of rainy days is March (7.6 days).
The month with the least rainy days is June (2.7 days).
Average sea temperature in October
San Diego, CA
- Average sea temperature in October: 65.1°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 October /
Average sunshine in October
San Diego, CA
- Average daylight in October: 11h 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 October: 8h and 48min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in October
San Diego, CA
- Average sunshine days in October: 23.8 days
The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is July (20.3 days).
Average UV index in October
San Diego, CA
- Average UV index in October: 5
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 October
San Diego, CA
- Average cloud cover in October: 14
The month with the most cloud cover is December (Cloud cover 24).
The month with the least cloud cover is August (Cloud cover 9).
Average visibility in October
San Diego, CA
- Average visibility in October: 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).
