Metar & Taf

Visual decoder

Weather in San Mateo County

Calculated from weather data of San Francisco International Airport (KSFO) between 2020 and 2024.

Maximum temperatures (°F)

Month Average 2024 2023 2022 2021 2020
January 59.0 59.0 60.0 58.0 60.0 58.0
February 61.0 60.0 58.0 64.0 63.0 64.0
March 62.0 58.0 64.0 63.0 61.0
April 65.0 63.0 65.0 65.0 65.0
May 67.0 65.0 68.0 67.0 71.0
June 72.0 68.0 73.0 73.0 73.0
July 72.0 71.0 70.0 71.0 71.0
August 74.0 76.0 74.0 73.0 75.0
September 75.0 73.0 76.0 73.0 77.0
October 73.0 76.0 68.0 69.0 77.0
November 64.0 68.0 61.0 65.0 63.0
December 58.0 62.0 55.0 55.0 60.0
Average 66.0 60.0 66.0 67.0 66.0 68.0

Average highest temperature per day

The maximum temperature is typically observed some hours after noon.

Minimum temperatures (°F)

Month Average 2024 2023 2022 2021 2020
January 48.0 49 49 46 48 47
February 47.0 48 44 46 48 48
March 48.0 47 48 48 49
April 51.0 49 50 51 51
May 53.0 54 52 53 54
June 56.0 56 56 58 56
July 57.0 56 57 57 56
August 59.0 60 58 58 58
September 59.0 60 60 57 59
October 55.0 58 54 55 56
November 50.0 54 46 53 48
December 48.0 51 44 47 47
Average 52.0 49.0 53.0 52.0 53.0 52.0

Average lowest temperature per day

The minimum temperature is typically observed just before sunrise.

Cold and hot days

Number of days 2024 2023 2022 2021 2020
86 °F or warmer 0 7 10 3 13
77 °F or warmer 0 25 28 21 43
68 °F or warmer 0 143 140 141 164
32 °F or colder 0 0 0 0 0

Precipitation (%)

Month Average 2024 2023 2022 2021 2020
January 9.5 14 17 0 5 3
February 9.6 20 20 0 3 0
March 7.9 24 1 2 6
April 1.9 0 2 1 4
May 1.5 3 0 0 2
June 0.1 0 1 0 0
July 0.0 0 0 0 0
August 0.2 1 0 0 1
September 0.2 0 2 0 0
October 0.7 1 0 5 0
November 3.3 2 5 2 1
December 7.1 11 17 12 3
Average 4.8 16.9 6.1 1.6 2.2 1.5

Precipitation during daylight period

Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.

Wind speed (miles per hour)

Month Average 2024 2023 2022 2021 2020
January 7.6 8 10 5 8 8
February 9.6 9 10 8 9 9
March 10.2 12 11 11 9
April 12.6 14 14 14 12
May 13.8 12 16 16 12
June 13.6 13 14 14 13
July 13.7 14 14 13 13
August 12.2 12 12 12 12
September 11.4 11 11 11 11
October 8.8 8 10 11 8
November 6.7 6 7 5 8
December 6.8 6 7 8 6
Average 10.5 8.6 10.7 11.1 11.2 10.2

Average wind speed

Excluding wind gusts. Only observations between sunrise and sunset are taken into account.

Prevailing wind direction

Month 2024 2023 2022 2021 2020
January SW SE E N NW
February S W NW NW NW
March SW NW W W
April W W W W
May W W W W
June W NW W W
July NW NW NW NW
August NW NW NW NW
September W NW NW NW
October NW NW W NW
November NW W N NW
December SE S SW NW

Prevailing wind direction

Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.

San Mateo County weather Q&A

What is the warmest month in San Mateo County?

The warmest month is September with an average temperature of 75 °F over the past years.

What is the coldest month in San Mateo County?

The coldest month is December with an average daytime temperature of 58 °F in the past few years.

Which month is the wettest in San Mateo County?

Chance of precipitation is the highest in February with a probability of around 9.7 %.

Which month is the driest in San Mateo County?

The least rainfall and snow can be expected in July. The probability is about 0.0 %.