California · county areal climate 1951–2025
San Mateo County, CA
A 57.3°F / 28.0" normal · 2025 ran +0.4°F vs normal.
2026 so far · through Jul 10: This area is running
+2.5°F (57.7°F) vs the 1996–2025 to-date normal — the
1st warmest start of 76 years. Precipitation
86% of normal.
U.S. year-to-date → Normal (1996–2025)
57.3°F
annual mean · 28.0" precipitation
2025 vs Normal
+0.4°F
57.7°F · 23.2" (83% of normal)
Warmest Year
59.7°F
2014 · coldest 54.0°F (1955)
Wettest Year
60.2in
1983 · driest 6.2" (2013)
Hottest Day
105.0°F
Sep 3 · 2017
Coldest Day
19.0°F
Dec 22 · 1990
Biggest Rain Day
4.89in
Jan 5 · 1982
Record
1951–2025
75 complete years · NOAA nClimGrid
—— normal temperature (°F) · ▮ normal precipitation (in) · 1996–2025
Areal
nClimGrid averages (NOAA/NCEI) over the whole area — an average across the region, not a single station. Separate from the
station records.