Weather on September 1
San Mateo, CA
55 Years of Data
About This Date
September 1st in San Mateo, CA typically brings pleasant fall weather, with average highs around 75°F and lows near 56°F. Over 55 years of records, the warmest September 1st was in 2017 (85°F average), while the coldest was 1974 (60°F) — a 25°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 1st dates historically. The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.8°F warmer on this date compared to 20-30 years ago.
Planning for September 1st in San Mateo, CA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 76° | 57° | 66° | — | — |
| 2024 | 72° | 57° | 64° | — | — |
| 2023 | 71° | 60° | 66° | — | — |
| 2022 | 72° | 55° | 63° | — | — |
| 2021 | 71° | 55° | 63° | — | — |
| 2020 | 72° | 58° | 65° | — | — |
| 2019 | 77° | 61° | 69° | — | — |
| 2018 | 68° | 55° | 62° | — | — |
| 2017warmest | 104° | 67° | 85° | — | — |
| 2016 | 68° | 58° | 63° | — | — |
| 2015 | 76° | 59° | 67° | — | — |
| 2014 | 83° | 60° | 71° | — | — |
| 2013 | 74° | 58° | 66° | — | — |
| 2012 | 68° | 53° | 61° | — | — |
| 2011 | 71° | 54° | 62° | — | — |
| 2010 | 92° | 58° | 75° | — | — |
| 2009 | 74° | 57° | 65° | — | — |
| 2008 | 82° | 55° | 69° | — | — |
| 2007 | 81° | 57° | 69° | — | — |
| 2006 | 69° | 55° | 62° | — | — |
| 2005 | 72° | 56° | 64° | — | — |
| 2004 | 72° | 59° | 65° | — | — |
| 2003 | 72° | 54° | 63° | — | — |
| 2002 | 91° | 54° | 72° | — | — |
| 2001 | 71° | 56° | 63° | — | — |
| 2000 | 63° | 59° | 61° | 0.18" | — |
| 1999 | 70° | 51° | 60° | — | — |
| 1998 | 69° | 53° | 61° | — | — |
| 1997 | 73° | 62° | 68° | — | — |
| 1996 | 71° | 52° | 61° | — | — |
| 1995 | 66° | 54° | 60° | — | — |
| 1994 | 67° | 57° | 62° | — | — |
| 1993 | 79° | 60° | 69° | — | — |
| 1992 | 73° | 59° | 66° | — | — |
| 1991 | 74° | 58° | 66° | — | — |
| 1990 | 70° | 58° | 64° | — | — |
| 1989 | 74° | 52° | 63° | — | — |
| 1988 | 69° | 54° | 61° | — | — |
| 1987 | 73° | 59° | 66° | — | — |
| 1986 | 76° | 52° | 64° | — | — |
| 1985 | 73° | 58° | 65° | — | — |
| 1984 | 90° | 56° | 73° | — | — |
| 1983 | 77° | 57° | 67° | — | — |
| 1982 | 76° | 52° | 64° | — | — |
| 1981 | 79° | 49° | 64° | — | — |
| 1980 | 70° | 53° | 61° | — | — |
| 1979 | 79° | 57° | 68° | — | — |
| 1978 | 86° | 55° | 71° | — | — |
| 1977 | 77° | 51° | 64° | — | — |
| 1976 | 76° | 49° | 62° | — | — |
| 1975 | 74° | 53° | 63° | — | — |
| 1974coldest | 68° | 52° | 60° | — | — |
| 1973 | 75° | 50° | 63° | — | — |
| 1972 | 76° | 51° | 63° | — | — |
| 1971 | 74° | 56° | 65° | — | — |
San Mateo, CA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
San Mateo, CA Monthly Precipitation
Average rainfall per month, in inches.
San Mateo, CA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit San Mateo, CA
San Mateo, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.