San Mateo weather by month

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San Mateo, California, enjoys a wonderfully mild Mediterranean climate, making it a desirable place to live and visit year-round. Situated on the San Francisco Peninsula, it benefits from a unique combination of factors – proximity to the Pacific Ocean, the sheltering effect of the Santa Cruz Mountains, and the influence of the San Francisco Bay. This results in relatively consistent temperatures and distinct seasonal variations. This guide provides a detailed look at the San Mateo weather by month, helping you plan your trips or simply understand what to expect throughout the year.

Overview of San Mateo’s Climate

San Mateo experiences warm, dry summers and mild, wet winters. Fog is a common occurrence, particularly during the summer months, rolling in from the Pacific Ocean and often lingering in the mornings. This fog contributes to the region’s characteristic microclimates, meaning weather can vary significantly even within short distances. Average temperatures range from the high 50s to the low 70s, with rainfall concentrated between November and April. Humidity is generally moderate, and strong winds are relatively uncommon.

San Mateo Weather by Month

Here’s a detailed breakdown of what you can expect each month:

Month Avg High (°F) Avg Low (°F) Rainfall (inches) Sunshine Hours Humidity (%)
January 57 45 4.1 130 78
February 60 46 3.4 150 75
March 63 48 2.8 180 72
April 66 50 1.6 220 68
May 69 53 0.8 260 65
June 72 56 0.3 280 62
July 74 58 0.1 300 60
August 75 59 0.1 290 61
September 74 58 0.4 260 64
October 69 54 1.4 220 68
November 63 49 2.6 170 72
December 58 46 3.6 140 75

Spring (March – May): Blooming Beauty

Spring in San Mateo is a delightful time. Temperatures gradually warm up, and the landscape bursts into bloom. March and April can still experience some rain showers, but these are typically short-lived. May is often the sunniest month of spring, with comfortable temperatures perfect for outdoor activities. Expect average highs in the mid-60s. The fog is less prevalent than in the summer months.

Summer (June – August): Mild and Foggy

San Mateo summers are known for their mild temperatures, rarely exceeding the low 80s. However, the marine layer often brings morning fog, which can linger throughout the day, especially closer to the coast. This fog keeps temperatures comfortable, but it can also reduce sunshine hours. June, July, and August are the driest months of the year. Pack layers, as temperatures can fluctuate significantly between morning and afternoon.

Autumn (September – November): Golden Days

Autumn is arguably the best time to visit San Mateo. The fog begins to dissipate, and the weather is consistently warm and sunny. September and October often experience “Indian Summer” conditions, with clear skies and pleasant temperatures. Rainfall starts to increase in November, but it’s still relatively mild. Average highs remain in the 60s and 70s.

Winter (December – February): Mild and Wet

Winters in San Mateo are mild compared to many other parts of the country. Temperatures rarely drop below freezing. Rainfall is the most significant weather factor during these months, with December, January, and February receiving the majority of the annual precipitation. While it can be rainy, extended periods of severe weather are uncommon. Expect average highs in the high 50s and low 60s.

**Frequently Asked Questions (FAQ)

Q: What is the rainiest month in San Mateo?
A: January is typically the rainiest month.

Q: Does San Mateo get a lot of sunshine?
A: San Mateo enjoys a good amount of sunshine, especially during the spring and autumn months, but summer can be foggy.

Q: What should I pack if I’m visiting in the summer?
A: Pack layers! Include a light jacket, sweater, and t-shirts, as temperatures can vary.

Q: Is San Mateo often windy?
A: No, San Mateo is generally sheltered from strong winds.

Q: What is the average temperature in San Mateo?
A: The average annual temperature is around 64°F (18°C).

**Resources

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