Weather forecast for 10 daysSan Mateo, CA

Weather forecast for the weekend

Saturday Oct 17, 2026

  • 84°F
  • 55°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 10mphNNW 339°
  • Humidity: 40%
  • UV index: 5
  • Sunrise: 7:19 am PDT
  • Sunset: 6:29 pm PDT
  • ▼
On Saturday, October 17, a sun-drenched sky is anticipated.
A daytime temperature reaching up to a warm 84.2°F will sharply contrast with a nighttime low of a mild 55.4°F.
The maximum heat index, which modifies the air temperature to account for humidity, is computed to be 84.2°F.
With a forecast of 84.2°F, conditions deviate from October's average and instead resemble September's climate trend.
Sunrise was at 7:19 am and sunset will be at 6:29 pm; the daylight will last for 11h and 10min.

Sunday Oct 18, 2026

  • 66°F
  • 54°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 8%
  • Precipitation: 0"
  • Wind: 14mphW 277°
  • Humidity: 74%
  • UV index: 5
  • Sunrise: 7:20 am PDT
  • Sunset: 6:28 pm PDT
  • ▼
Tomorrow, on Sunday, moments of sunshine will break through the patchy clouds.
Temperature fluctuations between an enjoyable 66.2°F and a crisp 53.6°F are predicted.
The temperature for tomorrow is predicted to correspond with the average October peak of 67.8°F.
Sunrise will be at 7:20 am and sunset at 6:28 pm; tomorrow's daylight will last for 11h and 7min.

10-day overview

Daily temperatures

Warmest day: today 84°C.
Minimum temperature: 64°C.

Chance of precipitation

Highest chance: Wednesday 48%.

Long-term weather forecast

  • Saturday
  • Oct 17, 2026
  • 84°F
  • 55°F
Sunny
Sunny
  • Precip. probability: 1%
  • Precipitation: 0"
  • Wind: 10mphNNW 339°
  • Humidity: 40%
  • UV index: 5
  • Sunrise: 7:19 am PDT
  • Sunset: 6:29 pm PDT
  • ▼
  • Sunday
  • Oct 18, 2026
  • 66°F
  • 54°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 8%
  • Precipitation: 0"
  • Wind: 14mphW 277°
  • Humidity: 74%
  • UV index: 5
  • Sunrise: 7:20 am PDT
  • Sunset: 6:28 pm PDT
  • ▼
  • Monday
  • Oct 19, 2026
  • 64°F
  • 54°F
Mostly Cloudy
Mostly Cloudy
  • Precip. probability: 8%
  • Precipitation: 0"
  • Wind: 12mphWNW 290°
  • Humidity: 63%
  • UV index: 4
  • Sunrise: 7:21 am PDT
  • Sunset: 6:26 pm PDT
  • ▼
  • Tuesday
  • Oct 20, 2026
  • 66°F
  • 54°F
Cloudy
Cloudy
  • Precip. probability: 24%
  • Precipitation: 0.04"
  • Wind: 8mphNNE 31°
  • Humidity: 67%
  • UV index: 3
  • Sunrise: 7:22 am PDT
  • Sunset: 6:25 pm PDT
  • ▼
  • Wednesday
  • Oct 21, 2026
  • 68°F
  • 55°F
AM Showers
AM Showers
  • Precip. probability: 48%
  • Precipitation: 0.12"
  • Wind: 8mphNNE 16°
  • Humidity: 71%
  • UV index: 3
  • Sunrise: 7:23 am PDT
  • Sunset: 6:24 pm PDT
  • ▼
  • Thursday
  • Oct 22, 2026
  • 64°F
  • 54°F
AM Clouds / PM Sun
AM Clouds / PM Sun
  • Precip. probability: 24%
  • Precipitation: 0"
  • Wind: 12mphWNW 287°
  • Humidity: 79%
  • UV index: 4
  • Sunrise: 7:24 am PDT
  • Sunset: 6:22 pm PDT
  • ▼
  • Friday
  • Oct 23, 2026
  • 68°F
  • 52°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 16%
  • Precipitation: 0"
  • Wind: 11mphWNW 302°
  • Humidity: 73%
  • UV index: 5
  • Sunrise: 7:25 am PDT
  • Sunset: 6:21 pm PDT
  • ▼
  • Saturday
  • Oct 24, 2026
  • 68°F
  • 54°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 6%
  • Precipitation: 0"
  • Wind: 11mphWNW 300°
  • Humidity: 68%
  • UV index: 4
  • Sunrise: 7:26 am PDT
  • Sunset: 6:20 pm PDT
  • ▼
  • Sunday
  • Oct 25, 2026
  • 70°F
  • 52°F
Partly Cloudy
Partly Cloudy
  • Precip. probability: 24%
  • Precipitation: 0"
  • Wind: 12mphWNW 282°
  • Humidity: 64%
  • UV index: 4
  • Sunrise: 7:27 am PDT
  • Sunset: 6:19 pm PDT
  • ▼
  • Monday
  • Oct 26, 2026
  • 68°F
  • 52°F
Mostly Sunny
Mostly Sunny
  • Precip. probability: 21%
  • Precipitation: 0"
  • Wind: 11mphNNW 330°
  • Humidity: 55%
  • UV index: 4
  • Sunrise: 7:28 am PDT
  • Sunset: 6:17 pm PDT
  • ▼
For the next ten days, a combination of overcast, bright and wet weather is forecasted.
Rainfall is anticipated on Tuesday and Wednesday.
Temperature differences will be noticeable across the forecast period. Highs will range from 64.4°F to 84.2°F, while the overnight low will be nearly unchanged, as the minimum temperature is expected to range between 51.8°F and 55.4°F.
Today is the hottest day, with a maximum temperature of 84.2°F; Monday and Thursday, with the highest temperature of 64.4°F, will be the coldest days in San Mateo, California.
Updated: Oct 17, 2026 @ 15:34:20 UTC
Published by: Weather U.S. | About Us
Data Sources | weather.com | Weather
Weather Forecasting & Climate

Frequently asked questions

On Saturday, expect consistent sunshine and open skies.

Today, the maximum temperature will be 84.2°F, while the minimum temperature will be 55.4°F. The maximum heat index, which measures the combined effect of heat and moisture, is estimated at 84.2°F.
The maximum temperature today will be notably higher than the average highest temperature of 67.8°F in October. Today, the lowest temperature will be in line with the average low temperature.

On Saturday, in San Mateo, sunrise was at 7:19 am and sunset will be at 6:29 pm (PDT).

In San Mateo, the length of the day today will be 11h and 10min.

Tomorrow, in San Mateo, mostly clear with scattered clouds is expected.

Tomorrow, the highest temperature will be 66.2°F, while the lowest temperature will be 53.6°F.
The highest temperature will be in line with the average maximum of 67.8°F in October. The lowest temperature will be also in line with the average low of 55.2°F.

On Sunday, in San Mateo, sunrise will be at 7:20 am and sunset at 6:28 pm (PDT).

In San Mateo, tomorrow, there will be 11h and 7min of daylight.