October weather forecast
South San Francisco, CA

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A sign in large font of the South San Francisco City, California, on the hills over the scenic home setting below
A sign in large font of the South San Francisco City, California, on the hills over the scenic home setting below

Weather in October

October, the same as September, is another refreshing autumn month in South San Francisco, California, with an average temperature varying between 55.4°F (13°C) and 66.9°F (19.4°C).

Temperature

The shift into October uncovers an average high-temperature of a refreshing 66.9°F (19.4°C), subtly different from the previous month. October nights in South San Francisco are marked by an average temperature drop to a mild 55.4°F (13°C).

Humidity

October and November, with an average relative humidity of 71%, are the least humid months in South San Francisco, California.

Rainfall

In South San Francisco, California, in October, during 2.9 rainfall days, 0.12" (3mm) of precipitation is typically accumulated. Throughout the year, there are 53.6 rainfall days, and 3.9" (99mm) of precipitation is accumulated.

Daylight

In October, the average length of the day is 11h and 12min.
On the first day of October in South San Francisco, sunrise is at 7:05 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 6:11 pm PDT.

Sunshine

In South San Francisco, the average sunshine in October is 7h.

UV index

In South San Francisco, California, the average daily maximum UV index in October is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In October, a daily UV index of 4 turns into the following recommendations:
Take necessary precautions - Defending against sun damage is advocated. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes.
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Frequently asked questions

What are October temperatures in South San Francisco?

The high-temperature in South San Francisco during October is 66.9°F (19.4°C) and the low-temperature is 55.4°F (13°C).

What is the least humid month in South San Francisco?

October and November, with an average relative humidity of 71%, are the least humid months.

What is the average humidity in October in South San Francisco?

In South San Francisco, California, the average relative humidity in October is 71%.

How much does it rain in South San Francisco in October?

In South San Francisco, California, during October, the rain falls for 2.9 days and regularly aggregates up to 0.12" (3mm) of precipitation.

What is the average length of the day in October in South San Francisco?

In October, the average day length in South San Francisco, California, is 11h and 12min.

When are sunrise and sunset in October in South San Francisco?

In October, on the first day of the month, sunrise is at 7:05 am and sunset at 6:52 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 6:11 pm PDT.

How many hours of sunshine does South San Francisco have in October?

In October, the average sunshine duration in South San Francisco is 7h.

What is the UV index intensity in October in South San Francisco?

The average daily maximum UV index in October in South San Francisco is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in October
South San Francisco, CA

Average temperature in October - South San Francisco, CA
  • Average high temperature in October: 66.9°F

The warmest month (with the highest average high temperature) is September (70°F).
The month with the lowest average high temperature is December (55.6°F).

  • Average low temperature in October: 55.4°F

The months with the highest average low temperature are August and September (56.5°F).
The coldest months (with the lowest average low temperature) are January, February and December (47.8°F).

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Average pressure in October
South San Francisco, CA

Average pressure in October - South San Francisco, CA
  • Average pressure in October: 29.98"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is September (29.92"Hg).

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Average wind speed in October
South San Francisco, CA

Average wind speed in October - South San Francisco, CA
  • Average wind speed in October: 6.5mph

The windiest month (with the highest average wind speed) is April (8.5mph).
The calmest month (with the lowest average wind speed) is September (6.2mph).

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Average humidity in October
South San Francisco, CA

Average humidity in October - South San Francisco, CA
  • Average humidity in October: 71%

The month with the highest relative humidity is August (78%).
The months with the lowest relative humidity are October and November (71%).

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Average rainfall in October
South San Francisco, CA

Average rainfall in October - South San Francisco, CA
  • Average rainfall in October: 0.12"

The wettest month (with the highest rainfall) is February (0.79").
The driest months (with the least rainfall) are June, July and August (0.04").

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Average rainfall days in October
South San Francisco, CA

Average rainfall days in October - South San Francisco, CA
  • Average rainfall days in October: 2.9 days

The month with the highest number of rainy days is March (9.4 days).
The month with the least rainy days is June (1.1 days).

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Average daylight in October /
Average sunshine in October
South San Francisco, CA

Average daylight in October / Average sunshine in October - South San Francisco, CA
  • Average daylight in October: 11h and 1min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in October: 7h and 0min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in October
South San Francisco, CA

Average sunshine days in October - South San Francisco, CA
  • Average sunshine days in October: 25.9 days

The months with the most sunshine days are June, July and September (26.3 days).
The month with the least sunshine days is March (19.4 days).

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Average UV index in October
South San Francisco, CA

Average UV index in October - South San Francisco, CA
  • Average UV index in October: 4

The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are February and December (UV index 3).

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Average cloud cover in October
South San Francisco, CA

Average cloud cover in October - South San Francisco, CA
  • Average cloud cover in October: 19

The month with the most cloud cover is March (Cloud cover 37).
The month with the least cloud cover is September (Cloud cover 16).

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Average visibility in October
South San Francisco, CA

Average visibility in October - South San Francisco, 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).

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South San Francisco, California, USA

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