March is one of the cooler months of the year in San Mateo, with average highs near 14.1°C and lows around 9.5°C (mean 11.8°C). It is a relatively wet time of year, averaging 81 mm of rainfall and 83% relative humidity across the period.
March is one of the cooler months of the year in San Mateo. Across 45 years of records, the warmest March in San Mateo was 2015 — when the month averaged 14.1°C — while the coldest was 1999 at 9.8°C. Typical March days reach 14.1°C with nights near 9.5°C. The long-term March temperature trend is broadly flat.
March is a relatively wet time of year in San Mateo, averaging 81 mm of rainfall. The wettest March on record was 1983 with 213 mm, while the driest was 1988 at 1 mm.
Relative humidity in San Mateo during March averages 83%. The most humid March was 1993 at 88%, and the least humid was 2021 at 79%.
March receives about 4.6 kWh/m²/day of solar energy in San Mateo. The sunniest March was 1988 at 5.3 kWh/m²/day, and the cloudiest was 2011 at 3.9.
Average wind speed in San Mateo during March is 4 m/s. The windiest March was 1991 at 5.5 m/s, while the calmest was 2015 at 2.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 11.7°C | 11.8°C | 11.7°C | 12.2°C | 11.4°C | -0.3°C |
| Avg High | 14.0°C | 14.1°C | 14.1°C | 14.5°C | 13.6°C | -0.4°C |
| Avg Low | 9.4°C | 9.5°C | 9.3°C | 9.9°C | 9.2°C | -0.2°C |
| Avg Rain | 101 mm | 78 mm | 58 mm | 89 mm | 78 mm | -24 mm |
March temperatures in San Mateo have stayed relatively stable across the record.
March has ranged from a record low of 5°C (2006) to a record high of 24.7°C (2005).
Rainfall in March is a relatively wet time of year, averaging 81 mm, with a wettest year of 213 mm.
A quieter season to visit San Mateo
If your dates are flexible, the more temperate months of September and August tend to be the most comfortable for visiting San Mateo. That said, March — with days averaging 14.1°C and nights around 9.5°C (mean 11.8°C) and higher rainfall (81 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.8°C | 11.7°C | 9.6°C | 21.7°C | 7.3°C | 59 mm | 86% | 4.2 m/s | 4.6 |
| 2024 | 14.0°C | 12.2°C | 10.3°C | 19.1°C | 9.1°C | 88 mm | 83% | 4.3 m/s | 4.6 |
| 2023 | 11.8°C | 9.9°C | 8.0°C | 14.4°C | 5.2°C | 198 mm | 83% | 4.5 m/s | 4.4 |
| 2022 | 14.3°C | 11.8°C | 9.3°C | 21.0°C | 7.8°C | 20 mm | 85% | 3.8 m/s | 5.1 |
| 2021 | 13.7°C | 11.0°C | 8.3°C | 21.8°C | 6.7°C | 40 mm | 79% | 3.9 m/s | 5.2 |
| 2020 | 14.0°C | 11.7°C | 9.5°C | 20.2°C | 6.6°C | 60 mm | 79% | 3 m/s | 4.3 |
| 2019 | 14.2°C | 12.0°C | 9.9°C | 19.4°C | 8.0°C | 102 mm | 83% | 3.6 m/s | 4.5 |
| 2018 | 14.3°C | 11.9°C | 9.5°C | 21.8°C | 5.6°C | 121 mm | 80% | 3.5 m/s | 4.5 |
| 2017 | 15.0°C | 12.7°C | 10.4°C | 20.2°C | 7.8°C | 69 mm | 86% | 3.6 m/s | 4.8 |
| 2016 | 14.9°C | 13.0°C | 11.0°C | 20.1°C | 9.1°C | 151 mm | 86% | 4.4 m/s | 4.3 |
| 2015 🔥 | 16.7°C | 14.1°C | 11.5°C | 22.4°C | 9.7°C | 8 mm | 84% | 2.8 m/s | 5 |
| 2014 | 15.9°C | 13.4°C | 10.9°C | 21.1°C | 8.6°C | 61 mm | 82% | 3.4 m/s | 4.6 |
| 2013 | 13.6°C | 11.2°C | 8.8°C | 17.8°C | 6.7°C | 27 mm | 86% | 3.4 m/s | 4.6 |
| 2012 | 12.9°C | 10.6°C | 8.3°C | 17.7°C | 5.8°C | 133 mm | 82% | 4.2 m/s | 4.1 |
| 2011 | 13.1°C | 11.2°C | 9.3°C | 20.6°C | 7.8°C | 156 mm | 86% | 4.2 m/s | 3.9 |
| 2010 | 13.9°C | 11.5°C | 9.1°C | 21.0°C | 7.0°C | 59 mm | 81% | 3.8 m/s | 4.8 |
| 2009 | 13.2°C | 11.0°C | 8.8°C | 17.8°C | 5.1°C | 63 mm | 84% | 4.4 m/s | 4.9 |
| 2008 | 13.3°C | 10.8°C | 8.3°C | 17.2°C | 6.6°C | 6 mm | 84% | 4 m/s | 5.2 |
| 2007 | 14.9°C | 12.1°C | 9.3°C | 20.6°C | 6.6°C | 10 mm | 85% | 3.3 m/s | 4.9 |
| 2006 | 11.8°C | 10.1°C | 8.4°C | 14.6°C | 5.0°C | 172 mm | 82% | 4.6 m/s | 4.1 |
| 2005 | 15.7°C | 13.4°C | 11.0°C | 24.7°C | 8.7°C | 104 mm | 83% | 3.9 m/s | 4.4 |
| 2004 | 16.0°C | 13.1°C | 10.1°C | 21.7°C | 7.8°C | 20 mm | 85% | 3.4 m/s | 5 |
| 2003 | 14.6°C | 12.3°C | 10.1°C | 20.3°C | 8.6°C | 42 mm | 85% | 4 m/s | 5.1 |
| 2002 | 13.3°C | 10.9°C | 8.4°C | 17.6°C | 5.4°C | 54 mm | 82% | 3.7 m/s | 4.8 |
| 2001 | 14.5°C | 12.1°C | 9.6°C | 21.3°C | 7.2°C | 61 mm | 87% | 4 m/s | 4.6 |
| 2000 | 13.4°C | 11.0°C | 8.7°C | 18.9°C | 7.4°C | 46 mm | 83% | 4.2 m/s | 4.9 |
| 1999 ❄️ | 11.7°C | 9.8°C | 7.9°C | 14.8°C | 6.3°C | 74 mm | 82% | 4.3 m/s | 4.6 |
| 1998 | 14.1°C | 12.0°C | 9.8°C | 18.3°C | 6.7°C | 69 mm | 85% | 3.9 m/s | 4.4 |
| 1997 | 14.5°C | 11.7°C | 8.9°C | 20.1°C | 5.3°C | 15 mm | 86% | 3.4 m/s | 5 |
| 1996 | 15.0°C | 12.5°C | 10.1°C | 19.3°C | 7.0°C | 48 mm | 83% | 3.5 m/s | 4.9 |
| 1995 | 14.2°C | 11.9°C | 9.7°C | 18.2°C | 6.2°C | 206 mm | 82% | 4.6 m/s | 4.1 |
| 1994 | 15.0°C | 12.4°C | 9.8°C | 19.9°C | 7.7°C | 12 mm | 83% | 3.3 m/s | 4.8 |
| 1993 | 15.0°C | 12.8°C | 10.6°C | 19.6°C | 9.0°C | 67 mm | 88% | 3.2 m/s | 4 |
| 1992 | 15.2°C | 13.2°C | 11.3°C | 18.2°C | 9.4°C | 67 mm | 84% | 3.5 m/s | 4.3 |
| 1991 | 12.6°C | 10.6°C | 8.5°C | 16.4°C | 5.8°C | 198 mm | 82% | 5.5 m/s | 4.2 |
| 1990 | 13.7°C | 11.2°C | 8.7°C | 17.8°C | 6.4°C | 26 mm | 86% | 3.6 m/s | 4.4 |
| 1989 | 13.3°C | 11.4°C | 9.5°C | 15.9°C | 5.6°C | 109 mm | 86% | 4.3 m/s | 4.1 |
| 1988 | 15.4°C | 12.1°C | 8.8°C | 18.6°C | 6.0°C | 1 mm | 79% | 4.4 m/s | 5.3 |
| 1987 | 14.5°C | 11.9°C | 9.3°C | 21.8°C | 6.9°C | 68 mm | 80% | 4.4 m/s | 4.7 |
| 1986 | 15.6°C | 13.3°C | 11.0°C | 20.4°C | 8.2°C | 117 mm | 85% | 3.9 m/s | 4.4 |
| 1985 | 12.4°C | 10.1°C | 7.8°C | 17.2°C | 5.9°C | 92 mm | 82% | 4.7 m/s | 4.7 |
| 1984 | 14.7°C | 12.3°C | 9.8°C | 18.6°C | 6.5°C | 37 mm | 83% | 4.4 m/s | 4.8 |
| 1983 🌧️ | 13.8°C | 12.3°C | 10.8°C | 15.6°C | 9.0°C | 213 mm | 83% | 4.6 m/s | — |
| 1982 | 12.6°C | 10.6°C | 8.6°C | 15.5°C | 5.3°C | 176 mm | 82% | 4.2 m/s | — |
| 1981 | 13.8°C | 11.5°C | 9.1°C | 16.8°C | 6.5°C | 97 mm | 82% | 4.1 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 14.1°C with lows near 9.5°C (mean 11.8°C), based on 45 years of NASA POWER data.
March averages 81 mm of rainfall in San Mateo, a relatively wet time of year. The wettest on record was 213 mm in 1983.
The hottest March reached 24.7°C in 2005. The coldest dipped to 5°C in 2006.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have fallen by about 0.1°C. Daytime highs moved from 13.5°C to 13.5°C and overnight lows from 9.2°C to 9.1°C over the same span.
March is one of the cooler months of the year in San Mateo and a relatively wet time of year, so plan for around 14.1°C daytime highs and 9.5°C at night.
Not quite — March is the 4th coolest month in San Mateo, averaging 11.8°C.
For March in San Mateo, pack light layers you can adjust through the day, with typical highs of 14.1°C and lows of 9.5°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 83% — quite humid.
Average wind speed in March is 4 m/s. The windiest March on record averaged 5.5 m/s (1991).
The wettest March on record was 1983 with 213 mm. On average, March sees 81 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in San Mateo behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
