Weather for San Mateo, California
Current Weather
Humidity: 78%
Feels Like: 61°F
Wind: WSW 4.5 mph
Wind Gusts: 7.7 mph
Precipitation: 0 in
Cloud Cover: 25%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast
Wed
H: 71°F
L: 56°F
Thu
H: 71°F
L: 56°F
Fri
H: 65°F
L: 56°F
Sat
H: 73°F
L: 57°F
Sun
H: 74°F
L: 57°F
Air Quality
Nitrogen Dioxide: 13.32 μg/m3
Sulphur Dioxide: 4.44 μg/m3
Ozone: 42 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 7:54 PM
Daylight: 13 hrs 25 mins
Moon Transit: 11:11 AM
Moonset: 6:47 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.9%
Best Times for Fishing or Hunting
Major Periods
6:41 PM - 9:11 PM10:41 AM - 1:11 PM
Minor Periods
6:17 PM - 7:47 PM2:57 AM - 4:27 AM
Action Rating: 3 out of 5
Heat Advisory issued August 19 at 9:05PM PDT until August 22 at 10:00PM PDT by NWS San Francisco CA
Effective: Tue August 19, 2025, 9:05 PM
Expires: Wed August 20, 2025, 6:00 AM
* WHAT...Temperatures from the 90s to near 105 expected. * WHERE...Santa Clara Valley and eastern hills, interior East Bay, North Bay interior mountains, Santa Cruz Mountains, Santa Lucia Range, southern Salinas Valley, Most of San Benito County and the interior mountains of Monterey County. * WHEN...From 10 AM Thursday to 10 PM PDT Friday. * IMPACTS...Hot conditions can cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries.
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles.
Heat Advisory issued August 19 at 9:05PM PDT until August 22 at 10:00PM PDT by NWS San Francisco CA
Effective: Tue August 19, 2025, 9:05 PM
Expires: Wed August 20, 2025, 6:00 AM
* WHAT...Temperatures from the 90s to near 105 expected. * WHERE...Santa Clara Valley and eastern hills, interior East Bay, North Bay interior mountains, Santa Cruz Mountains, Santa Lucia Range, southern Salinas Valley, Most of San Benito County and the interior mountains of Monterey County. * WHEN...From 10 AM Thursday to 10 PM PDT Friday. * IMPACTS...Hot conditions can cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries.
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles.
Heat Advisory issued August 19 at 9:05PM PDT until August 22 at 10:00PM PDT by NWS San Francisco CA
Effective: Tue August 19, 2025, 9:05 PM
Expires: Wed August 20, 2025, 6:00 AM
* WHAT...Temperatures from the 90s to near 105 expected. * WHERE...Santa Clara Valley and eastern hills, interior East Bay, North Bay interior mountains, Santa Cruz Mountains, Santa Lucia Range, southern Salinas Valley, Most of San Benito County and the interior mountains of Monterey County. * WHEN...From 10 AM Thursday to 10 PM PDT Friday. * IMPACTS...Hot conditions can cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries.
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles.
Heat Advisory issued August 19 at 9:05PM PDT until August 22 at 10:00PM PDT by NWS San Francisco CA
Effective: Tue August 19, 2025, 9:05 PM
Expires: Wed August 20, 2025, 6:00 AM
* WHAT...Temperatures from the 90s to near 105 expected. * WHERE...Santa Clara Valley and eastern hills, interior East Bay, North Bay interior mountains, Santa Cruz Mountains, Santa Lucia Range, southern Salinas Valley, Most of San Benito County and the interior mountains of Monterey County. * WHEN...From 10 AM Thursday to 10 PM PDT Friday. * IMPACTS...Hot conditions can cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries.
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles.
Heat Advisory issued August 19 at 9:05PM PDT until August 22 at 10:00PM PDT by NWS San Francisco CA
Effective: Tue August 19, 2025, 9:05 PM
Expires: Wed August 20, 2025, 6:00 AM
* WHAT...Temperatures from the 90s to near 105 expected. * WHERE...Santa Clara Valley and eastern hills, interior East Bay, North Bay interior mountains, Santa Cruz Mountains, Santa Lucia Range, southern Salinas Valley, Most of San Benito County and the interior mountains of Monterey County. * WHEN...From 10 AM Thursday to 10 PM PDT Friday. * IMPACTS...Hot conditions can cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. Impacts possible in some health systems and in heat-sensitive industries.
Hydration is a critical piece to surviving the heat. Drink water, and if possible, take water to those who are vulnerable. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to the early morning or evening. Take action when you experience symptoms of heat exhaustion and/or heat stroke. Beat the heat and check the backseat! Do not leave young children or pets in unattended vehicles.
Weather Forecast
Average Temperature: 61.1°F
Average Humidity: 85%
Wind: 10.3 mph
UV Index: 2.3
Air Quality
Nitrogen Dioxide: 13.02 μg/m3
Sulphur Dioxide: 4.06 μg/m3
Ozone: 49.4 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 7:54 PM
Daylight: 13 hrs 25 mins
Moon Transit: 11:11 AM
Moonset: 6:47 PM
Moon Phase: Waning Crescent
Moon Illumination: 4.9%
Best Times for Fishing or Hunting
Major Periods
6:41 PM - 9:11 PM10:41 AM - 1:11 PM
Minor Periods
6:17 PM - 7:47 PM2:57 AM - 4:27 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 61°F
Average Humidity: 85%
Wind: 10.1 mph
UV Index: 2.2
Air Quality
Nitrogen Dioxide: 19.39 μg/m3
Sulphur Dioxide: 4.48 μg/m3
Ozone: 52.56 μg/m3
Astronomical
Sun Transit: 1:12 PM
Sunset: 7:53 PM
Daylight: 13 hrs 22 mins
Moon Transit: 12:05 AM
Moonset: 7:21 PM
Moon Phase: Waning Crescent
Moon Illumination: 1.2%
Best Times for Fishing or Hunting
Major Periods
7:33 PM - 10:03 PM11:35 AM - 2:05 PM
Minor Periods
6:51 PM - 8:21 PM4:09 AM - 5:39 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 59.1°F
Average Humidity: 89%
Wind: 10.1 mph
UV Index: 2.2
Air Quality
Nitrogen Dioxide: 23.35 μg/m3
Sulphur Dioxide: 3.99 μg/m3
Ozone: 59.8 μg/m3
Astronomical
Sun Transit: 1:11 PM
Sunset: 7:52 PM
Daylight: 13 hrs 20 mins
Moon Transit: 12:54 AM
Moonset: 7:50 PM
Moon Phase: New
Moon Illumination: 0.0%
Best Times for Fishing or Hunting
Major Periods
8:21 PM - 10:51 PM12:24 AM - 2:54 PM
Minor Periods
7:20 PM - 8:50 PM5:18 AM - 6:48 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 63.5°F
Average Humidity: 77%
Wind: 9.6 mph
UV Index: 2.2
Air Quality
Nitrogen Dioxide: 17.28 μg/m3
Sulphur Dioxide: 2.92 μg/m3
Ozone: 58.38 μg/m3
Astronomical
Sun Transit: 1:11 PM
Sunset: 7:50 PM
Daylight: 13 hrs 18 mins
Moon Transit: 1:40 PM
Moonset: 8:15 PM
Moon Phase: New
Moon Illumination: 1.4%
Best Times for Fishing or Hunting
Major Periods
9:06 PM - 11:36 PM1:10 PM - 3:40 PM
Minor Periods
7:45 PM - 9:15 PM6:25 AM - 7:55 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 61.7°F
Average Humidity: 81%
Wind: 8.7 mph
UV Index: 0
Air Quality
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3
Astronomical
Sun Transit: 1:11 PM
Sunset: 7:49 PM
Daylight: 13 hrs 16 mins
Moon Transit: 2:22 PM
Moonset: 8:38 PM
Moon Phase: New
Moon Illumination: 0.1%
Best Times for Fishing or Hunting
Major Periods
12:00 AM - 12:00 AM1:52 PM - 4:22 PM
Minor Periods
8:08 PM - 9:38 PM7:28 AM - 8:58 AM
Action Rating: 4 out of 5