San Mateo, CA weather and climate in 2024
Day
17 °C
Night
8 °C
Sea
13 °C
Precipitation
66 mm
in month
Rainy days
8 days
in month
Daylight
10 hours
average
Sunshine
6 hours
average
Humidity
76 %
Day
17 °C
Night
8 °C
Sea
13 °C
Precipitation
66 mm
in month
Rainy days
8 days
in month
Daylight
10 hours
average
Sunshine
6 hours
average
Humidity
76 %
Overview: San Mateo, CA
Weather charts for San Mateo, CA
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Weather overview for San Mateo, CA
Weather overview
San Mateo, CA experiences a mild Mediterranean climate with warm and dry summers and cooler, wet winters. Daytime temperatures can reach an average high of 23 °C (73 °F) in August to a refreshing 14 °C (57 °F) in January. While precipitation is key in the winter, with rainfall reaching 101 mm (3.97 in) in December, the summer months are notably dry, with July receiving only 0 mm (0.01 in) of rain. The rare rainy days of summer encourage lush greenery which becomes the town's pride. With minimal humidity level variances throughout the year and a gentle sea breeze, many find the climate comfortable for outdoor activities.
January weather
January is one of the cooler months in San Mateo, with an average high of 14 °C (57 °F) during the day and nights dipping to an average low of 6 °C (42 °F). The rains are more common, with an average of 10 days of wet days, which could result in sporadic shower encounters.
February weather
February sees a slight rise in daytime temps to 16 °C (60 °F) and a noticeable decrease in precipitation with around 10 days of wet days. Ample sunshine graces the city, enhancing outdoor activity opportunities.
March weather
March heralds the approach of spring with an average daytime high of 17 °C (63 °F). San Mateo's landscape begins to bloom, though with 10 days of wet days, the rain hasn't said its last word just yet.
April weather
April in San Mateo is quite pleasant, with the average daytime high reaching 18 °C (65 °F) and the rain tapering off to about 6 days of wet days, allowing for more consistent sunny adventures.
May weather
The arrival of May marks the start of drier times with an average of 3 days wet days only. With tempertatures now climbing to 20 °C (68 °F), locals begin enjoying longer days under the Californian sun.
June weather
June in San Mateo brings even warmer days, with the average high rising to 22 °C (71 °F). With barely 1 day of wet days, summer is truly here, characterized by dry, golden hills and clear blue skies.
July weather
July sees the peak of summer with average highs reaching 23 °C (73 °F) and rainfall at an almost non-existent level of 0 mm (0.01 in), perfect for beach outings and hiking trails alike.
August weather
August in San Mateo typically showcases the highest temperatures of the year peaking at 23 °C (73 °F), but the coastal influence keeps conditions enjoyable.
September weather
September still holds onto the warmth of summer with an average high of 23 °C (74 °F) and lengthening shadows hint at the arrival of fall, along with a slight increase in wet days to 1 day.
October weather
October cools down slightly with 21 °C (70 °F) being the average high, and the fall season becomes evident with a rise in rainfall to 3 days, reviving the green in nature.
November weather
November's weather sees a marked descent in temperatures to an average high of 17 °C (63 °F) and a substantial increase in rainfall with 8 days of wet days, signaling a clear shift towards winter.
December weather
December sees the lowest daytime highs of the whole year, averaging 14 °C (57 °F) and the onset of the rainy season with 10 days of wet days, offering cozy indoor moments and the occasional serene walk in the rain.
FAQs
How many layers should I wear during a typical January day in San Mateo?
In January, dressing in layers is advisable as the average high is 14 °C (57 °F). A warm jacket and possibly a scarf in the morning and evening when it is cooler will keep you comfortable.
Is an umbrella necessary in February in San Mateo?
While the rain eases off in February with around 10 days of rainfall, it's still a good idea to have an umbrella handy for those occasional showers.
Is there a big difference between daytime and nighttime temperatures in San Mateo during March?
March in San Mateo does see a contrast in temperatures from day to night, with warmer days at an average high of 17 °C (63 °F) and cooler nights averaging at 8 °C (47 °F).
Is April a good month for picnics in San Mateo?
Absolutely, April's warmer weather with highs of 18 °C (65 °F) and fewer rainy days make it a great month to enjoy outdoor picnics and activities in San Mateo's parks.
Would I need air conditioning in San Mateo during May?
May's warmer daytime temperature of 20 °C (68 °F) could make air conditioning a comfort, especially for those more sensitive to heat, yet evenings remain cool, which moderates the daily average.
How should I dress for a June day in San Mateo?
Light summer attire is appropriate for a June day in San Mateo with highs of 22 °C (71 °F). Don't forget sunglasses and sunscreen for protection against the strong California sun.
Is July too hot in San Mateo for outdoor activities?
No, with comfortable peak temperatures averaging 23 °C (73 °F), July in San Mateo is ideal for all outdoor activities from morning hikes to evening strolls.
What's the typical temperature range in San Mateo during August?
The typical temperature in San Mateo during August ranges from a comfortable 14 °C (57 °F) at night to a warm 23 °C (73 °F) during the day.
How does the weather begin to change in September in San Mateo?
September weather in San Mateo is still warm with a high of 23 °C (74 °F), but the air begins to carry a hint of fall as the nights grow cooler and the wet days slightly increase.
Should I expect many rainy days in San Mateo during October?
October brings a bit more rain to San Mateo, with an average of 3 days of wet days, but it's still quite moderate and shouldn't disrupt daily plans too significantly.
Will I need to bundle up in San Mateo during November?
While November is cooler with average highs of 17 °C (63 °F), a heavy coat isn't necessary; just don a warm jumper or a light jacket.
Is a heavy winter coat required for the weather in San Mateo in December?
A heavy winter coat may be more of a comfort than a necessity with December highs of 14 °C (57 °F); nonetheless, a medium-weight jacket should suffice for most.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.