San Diego
California, USA
Long-term weather forecast
Long-term weather forecast

October weather forecast and climate
San Diego, CA

The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
The view of Coronado Island in San Diego, California, from across a water body on a sidewalk, with a row of palm trees
October, like September, is an agreeable autumn month in San Diego, California, with average temperature fluctuating between 61.9°F (16.6°C) and 73.2°F (22.9°C).

Temperature

In San Diego, the average high-temperature is practically the same as in September - an agreeable 73.2°F (22.9°C). The average low-temperature, in October, is 61.9°F (16.6°C).

Humidity

The average relative humidity in San Diego is 65%.

Rainfall

In San Diego, it is raining for 3.4 days, with typically 0.31" (8mm) of accumulated precipitation. Throughout the year, there are 61.8 rainfall days, and 8.7" (221mm) of precipitation is accumulated.

Ocean temperature

In October, the average ocean temperature is 65.1°F (18.4°C).
Note: For swimming, a surface water temperature of 65.1°F (18.4°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

Daylight

The average length of the day in San Diego, California, is 11.3h.

Sunshine

In San Diego, California, the average sunshine is 8.8h.

UV index

The average daily maximum UV index in San Diego is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: In October, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in October in San Diego?

The average high-temperature, in October, in San Diego, is 73.2°F (22.9°C), while the average low-temperature is 61.9°F (16.6°C).

What is the average humidity in October in San Diego?

The average relative humidity in October is 65%.

How much does it rain in San Diego in October?

In San Diego, California, in October, during 3.4 rainfall days, 0.31" (8mm) of precipitation is typically accumulated.

What is the ocean temperature in October in San Diego?

In San Diego, California, in October, the average water temperature is 65.1°F (18.4°C). For swimming, a surface water temperature of 65.1°F (18.4°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

How many hours of daylight does San Diego have in October?

The average length of the day in October in San Diego is 11.3h.

How many hours of sunshine does San Diego have in October?

In October, the average sunshine in San Diego is 8.8h.

What is the UV index reading in October in San Diego?

In San Diego, California, the average daily maximum UV index in October is 5. A UV Index reading of 3 to 5 represents a moderate health threat from the exposure to the Sun's UV rays.
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 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 lowest 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 lowest number of 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: 11.3h

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

  • Average sunshine in October: 8.8h

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

Average UV index in October - San Diego, CA
  • Average UV index in October: 5

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).