June is one of the warmer months of the year in San Mateo, with average highs near 16.7°C and lows around 11.7°C (mean 14.2°C). It is one of the drier months, averaging 7 mm of rainfall and 85% relative humidity across the period.
June is one of the warmer months of the year in San Mateo. Across 45 years of records, the warmest June in San Mateo was 1981 — when the month averaged 15.5°C — while the coldest was 1999 at 12.8°C. Typical June days reach 16.7°C with nights near 11.7°C. The long-term June temperature trend is broadly flat.
June is one of the drier months in San Mateo, averaging 7 mm of rainfall. The wettest June on record was 2011 with 37 mm, while the driest was 2003 at 1 mm.
Relative humidity in San Mateo during June averages 85%. The most humid June was 2006 at 89%, and the least humid was 1981 at 79%.
June receives about 7.1 kWh/m²/day of solar energy in San Mateo. The sunniest June was 2001 at 8 kWh/m²/day, and the cloudiest was 1998 at 6.2.
Average wind speed in San Mateo during June is 3.9 m/s. The windiest June was 1997 at 4.6 m/s, while the calmest were 1985, 2006 and 2015 at 3.3 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 14.5°C | 14.1°C | 13.9°C | 14.2°C | 14.3°C | -0.2°C |
| Avg High | 17.2°C | 16.7°C | 16.3°C | 16.6°C | 16.5°C | -0.7°C |
| Avg Low | 11.7°C | 11.5°C | 11.5°C | 11.9°C | 12.0°C | +0.3°C |
| Avg Rain | 6 mm | 9 mm | 6 mm | 9 mm | 2 mm | -3 mm |
June temperatures in San Mateo have fallen by about 0.3°C between 1981–1985 and 2021–2025.
June has ranged from a record low of 8.8°C (2008) to a record high of 31.2°C (2003).
Rainfall in June is one of the drier months, averaging 7 mm, with a wettest year of 37 mm.
Daytime highs and overnight lows have shifted differently — highs fell about 0.2°C per decade while lows rose 0.1°C per decade, narrowing the gap between day and night.
A good time to visit San Mateo
June is a good time to visit San Mateo, with days averaging 16.7°C and nights around 11.7°C (mean 14.2°C, close to San Mateo's yearly average) and low rainfall. September and August are marginally more temperate, but June still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 15.5°C | 13.4°C | 11.4°C | 17.9°C | 10.7°C | 1 mm | 86% | 4.2 m/s | 7.1 |
| 2024 | 16.3°C | 13.9°C | 11.5°C | 19.3°C | 10.6°C | 2 mm | 86% | 4.2 m/s | 7.5 |
| 2023 | 15.4°C | 13.7°C | 11.9°C | 17.6°C | 10.4°C | 2 mm | 87% | 3.9 m/s | 6.3 |
| 2022 | 17.4°C | 14.8°C | 12.1°C | 28.0°C | 10.2°C | 4 mm | 83% | 4 m/s | 7.5 |
| 2021 | 16.9°C | 14.7°C | 12.4°C | 20.0°C | 10.7°C | 1 mm | 84% | 4 m/s | 7.4 |
| 2020 | 17.6°C | 15.0°C | 12.5°C | 21.5°C | 11.2°C | 2 mm | 84% | 4 m/s | 7.7 |
| 2019 | 18.1°C | 15.4°C | 12.7°C | 28.8°C | 10.9°C | 1 mm | 82% | 3.5 m/s | 7.3 |
| 2018 | 16.5°C | 14.1°C | 11.8°C | 21.9°C | 10.4°C | 1 mm | 86% | 4.2 m/s | 7.7 |
| 2017 | 16.5°C | 14.3°C | 12.0°C | 22.8°C | 10.2°C | 3 mm | 87% | 4 m/s | 7.3 |
| 2016 | 17.2°C | 14.7°C | 12.2°C | 20.9°C | 11.2°C | 2 mm | 85% | 3.8 m/s | 7.3 |
| 2015 | 17.0°C | 14.8°C | 12.5°C | 23.5°C | 11.1°C | 6 mm | 87% | 3.3 m/s | 6.8 |
| 2014 | 17.1°C | 14.5°C | 11.9°C | 23.1°C | 10.6°C | 2 mm | 84% | 3.8 m/s | 7.2 |
| 2013 | 16.6°C | 14.3°C | 12.0°C | 21.1°C | 10.4°C | 34 mm | 86% | 4 m/s | 7 |
| 2012 | 15.8°C | 13.4°C | 11.0°C | 21.4°C | 8.9°C | 5 mm | 84% | 4.1 m/s | 7.8 |
| 2011 🌧️ | 15.5°C | 13.3°C | 11.1°C | 22.1°C | 10.2°C | 37 mm | 87% | 3.9 m/s | 6.7 |
| 2010 | 15.9°C | 13.6°C | 11.3°C | 21.8°C | 9.5°C | 2 mm | 87% | 4.2 m/s | 7.4 |
| 2009 | 16.5°C | 14.4°C | 12.3°C | 20.9°C | 10.9°C | 4 mm | 85% | 3.5 m/s | 6.8 |
| 2008 | 16.7°C | 13.6°C | 10.5°C | 28.0°C | 8.8°C | 1 mm | 80% | 4.1 m/s | 7.5 |
| 2007 | 15.5°C | 13.2°C | 10.9°C | 21.1°C | 9.8°C | 4 mm | 86% | 4 m/s | 7.6 |
| 2006 | 16.7°C | 14.4°C | 12.2°C | 20.7°C | 10.8°C | 2 mm | 89% | 3.3 m/s | 6.9 |
| 2005 | 15.7°C | 13.6°C | 11.4°C | 18.6°C | 9.6°C | 14 mm | 87% | 3.9 m/s | 7.3 |
| 2004 | 15.9°C | 13.8°C | 11.7°C | 17.9°C | 10.4°C | 2 mm | 87% | 4.4 m/s | 7.3 |
| 2003 | 16.9°C | 14.3°C | 11.7°C | 31.2°C | 10.1°C | 1 mm | 85% | 3.8 m/s | 6.9 |
| 2002 | 15.8°C | 13.3°C | 10.9°C | 22.8°C | 9.5°C | 1 mm | 85% | 4.4 m/s | 7.1 |
| 2001 | 16.3°C | 13.7°C | 11.1°C | 20.0°C | 9.3°C | 4 mm | 85% | 4.3 m/s | 8 |
| 2000 | 16.9°C | 14.4°C | 11.9°C | 28.2°C | 10.1°C | 30 mm | 86% | 3.4 m/s | 6.6 |
| 1999 ❄️ | 15.2°C | 12.8°C | 10.4°C | 19.1°C | 9.0°C | 5 mm | 86% | 4.1 m/s | 7.2 |
| 1998 | 16.9°C | 14.8°C | 12.7°C | 22.3°C | 12.1°C | 5 mm | 85% | 3.8 m/s | 6.2 |
| 1997 | 17.0°C | 14.6°C | 12.1°C | 19.1°C | 10.4°C | 6 mm | 85% | 4.6 m/s | 7.6 |
| 1996 | 16.4°C | 13.6°C | 10.8°C | 22.6°C | 9.8°C | 2 mm | 86% | 3.8 m/s | 7.7 |
| 1995 | 16.5°C | 13.8°C | 11.1°C | 23.9°C | 8.9°C | 25 mm | 86% | 3.7 m/s | 7.1 |
| 1994 | 16.6°C | 13.7°C | 10.7°C | 25.4°C | 9.8°C | 8 mm | 83% | 4.1 m/s | 7.7 |
| 1993 | 18.4°C | 15.3°C | 12.2°C | 25.9°C | 10.3°C | 15 mm | 81% | 4.3 m/s | 7.7 |
| 1992 | 17.1°C | 14.9°C | 12.6°C | 18.8°C | 11.3°C | 11 mm | 86% | 3.5 m/s | 6.3 |
| 1991 | 15.7°C | 13.1°C | 10.4°C | 21.5°C | 9.2°C | 10 mm | 84% | 3.8 m/s | 6.5 |
| 1990 | 17.3°C | 14.5°C | 11.8°C | 23.9°C | 10.3°C | 2 mm | 85% | 4.1 m/s | 7.3 |
| 1989 | 17.3°C | 14.6°C | 11.9°C | 25.3°C | 10.4°C | 5 mm | 82% | 3.9 m/s | 6.6 |
| 1988 | 16.9°C | 14.4°C | 11.9°C | 21.3°C | 9.7°C | 10 mm | 83% | 3.8 m/s | 6.7 |
| 1987 | 16.9°C | 14.2°C | 11.4°C | 23.8°C | 10.3°C | 4 mm | 81% | 3.6 m/s | 6.3 |
| 1986 | 17.7°C | 15.0°C | 12.3°C | 25.1°C | 11.2°C | 2 mm | 83% | 3.4 m/s | 6.7 |
| 1985 | 18.0°C | 15.0°C | 12.1°C | 22.2°C | 10.5°C | 4 mm | 82% | 3.3 m/s | 6.7 |
| 1984 | 16.4°C | 13.6°C | 10.8°C | 18.8°C | 9.8°C | 8 mm | 84% | 4.4 m/s | 6.8 |
| 1983 | 17.0°C | 14.3°C | 11.6°C | 21.0°C | 10.5°C | 4 mm | 87% | 4.4 m/s | — |
| 1982 | 15.8°C | 13.6°C | 11.3°C | 19.8°C | 9.4°C | 11 mm | 86% | 3.7 m/s | — |
| 1981 🔥 | 18.8°C | 15.5°C | 12.1°C | 25.3°C | 10.6°C | 1 mm | 79% | 4.5 m/s | — |
Actual recorded June data for each year, 1981–2025 — sourced from NASA POWER.
The average high in June is around 16.7°C with lows near 11.7°C (mean 14.2°C), based on 45 years of NASA POWER data.
June averages 7 mm of rainfall in San Mateo, one of the drier months. The wettest on record was 37 mm in 2011.
The hottest June reached 31.2°C in 2003. The coldest dipped to 8.8°C in 2008.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average June temperatures have fallen by about 0.3°C — but days and nights have moved in opposite directions. Overnight lows rose from 11.6°C to 11.9°C while daytime highs eased from 17.2°C to 16.3°C, narrowing the gap between day and night.
June is one of the warmer months of the year in San Mateo and one of the drier months, so plan for around 16.7°C daytime highs and 11.7°C at night.
Not quite — June is the 8th coolest month in San Mateo, averaging 14.2°C.
For June in San Mateo, pack light layers you can adjust through the day, with typical highs of 16.7°C and lows of 11.7°C.
Relative humidity in June averages 85% — quite humid.
Average wind speed in June is 3.9 m/s. The windiest June on record averaged 4.6 m/s (1997).
The wettest June on record was 2011 with 37 mm. On average, June sees 7 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 June, 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 June specifically, along with year-by-year records and how the month has changed over the decades.
