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San Ramon, CA Weather on May 27
May 27th in San Ramon, CA typically brings pleasant spring weather, with average highs around 72°F and lows near 49°F. Over 55 years of records, the warmest May 27th was in 2020 (81°F average), while the coldest was 1987 (46°F) — a 35°F range across recorded history. Rain or other precipitation has occurred on about 4% of May 27th dates historically. The last decade has been 4.7°F cooler on this date compared to 20-30 years ago.
What to Expect on May 27
Planning for May 27th in San Ramon, CA? Great weather for outdoor activities.
May 27 Weather Records for San Ramon
- •The all-time record high for May 27th in San Ramon, CA is 95°F, set in 1974.
- •The coldest May 27th on record dropped to 36°F in 2008.
- •Temperatures have reached 90°F or higher on May 27th in 4 of the last 55 years.
Frequently Asked Questions
What was the warmest May 27 ever in San Ramon?
The warmest May 27 in San Ramon, CA reached 95°F in 1974. That is 23°F above the long-term average high of 72°F.
What was the coldest May 27 ever in San Ramon?
The coldest May 27 in San Ramon, CA dropped to 36°F in 2008. That is 13°F below the long-term average low of 49°F.
What is the average temperature on May 27 in San Ramon?
On May 27, San Ramon averages a high of 72°F and a low of 49°F based on 55 years of NOAA weather observations from LIVERMORE CALIFORNIA.
How many years of weather data are available for May 27 in San Ramon?
We have 55 years of weather records for May 27 in San Ramon, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
May 27 Weather History in San Ramon
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 65°F | 47°F | 0" | -- |
| 2024 | 72°F | 56°F | 0" | -- |
| 2023 | 60°F | 44°F | 0" | -- |
| 2022 | 64°F | 47°F | 0" | -- |
| 2021 | 75°F | 48°F | 0" | -- |
| 2020 | 91°F | 71°F | 0" | -- |
| 2019 | 50°F | 42°F | 0.13" | -- |
| 2018 | 63°F | 47°F | 0" | -- |
| 2017 | 60°F | 45°F | 0" | -- |
| 2016 | 72°F | 54°F | 0" | -- |
| 2015 | 64°F | 45°F | 0" | -- |
| 2014 | 81°F | 56°F | 0" | -- |
| 2013 | 64°F | 45°F | 0" | -- |
| 2012 | 52°F | 43°F | 0" | -- |
| 2011 | 58°F | 43°F | 0" | -- |
| 2010 | 56°F | 41°F | 0" | -- |
| 2009 | 76°F | 66°F | 0" | -- |
| 2008 | 63°F | 36°F | 0" | -- |
| 2007 | 80°F | 40°F | 0" | -- |
| 2006 | 65°F | 47°F | -- | -- |
| 2005 | 73°F | 52°F | -- | -- |
| 2004 | 76°F | 54°F | -- | -- |
| 2003 | 94°F | 54°F | -- | -- |
| 2002 | 74°F | 49°F | -- | -- |
| 2001 | 66°F | 50°F | -- | -- |
| 2000 | 79°F | 54°F | -- | -- |
| 1999 | 69°F | 48°F | -- | -- |
| 1998 | 63°F | 46°F | -- | -- |
| 1997 | 83°F | 59°F | -- | -- |
| 1996 | 76°F | 51°F | -- | -- |
| 1995 | 68°F | 50°F | -- | -- |
| 1994 | 75°F | 49°F | -- | -- |
| 1993 | 67°F | 53°F | -- | -- |
| 1992 | 82°F | 53°F | -- | -- |
| 1991 | 76°F | 47°F | -- | -- |
| 1990 | 62°F | 54°F | -- | -- |
| 1989 | 76°F | 45°F | 0" | -- |
| 1988 | 67°F | 46°F | 0" | -- |
| 1987 | 53°F | 40°F | 0" | -- |
| 1986 | 80°F | 58°F | 0" | -- |
| 1985 | 56°F | 43°F | 0" | -- |
| 1984 | 85°F | 57°F | 0" | -- |
| 1983 | 84°F | 61°F | 0" | -- |
| 1982 | 69°F | 45°F | 0" | -- |
| 1981 | 80°F | 57°F | 0" | -- |
| 1980 | 64°F | 38°F | 0" | -- |
| 1979 | 87°F | 44°F | 0" | -- |
| 1978 | 72°F | 46°F | 0" | -- |
| 1977 | 56°F | 39°F | 0.13" | -- |
| 1976 | 92°F | 59°F | 0" | -- |
| 1975 | 87°F | 65°F | 0" | -- |
| 1974 | 95°F | 62°F | 0" | -- |
| 1973 | 72°F | 45°F | 0" | -- |
| 1972 | 79°F | 41°F | 0" | -- |
| 1971 | 69°F | 43°F | 0" | -- |
Based on 55 years of data from NOAA station: LIVERMORE CALIFORNIA
Monthly Climate Averages
Historical temperature and precipitation averages for San Ramon, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.