Basilemorin / CC0
San Marcos, CA Weather on May 28
May 28th in San Marcos, CA typically brings pleasant spring weather, with average highs around 78°F and lows near 56°F. Over 55 years of records, the warmest May 28th was in 1973 (79°F average), while the coldest was 1971 (55°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 7% of May 28th dates historically, with the wettest May 28th recording 2.03" of rain. The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
What to Expect on May 28
Planning for May 28th in San Marcos, CA? Great weather for outdoor activities.
May 28 Weather Records for San Marcos
- •The all-time record high for May 28th in San Marcos, CA is 101°F, set in 1973.
- •The coldest May 28th on record dropped to 43°F in 2003.
- •Temperatures have reached 90°F or higher on May 28th in 7 of the last 55 years.
- •Last year (1971), May 28th was 13°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest May 28 ever in San Marcos?
The warmest May 28 in San Marcos, CA reached 101°F in 1973. That is 23°F above the long-term average high of 78°F.
What was the coldest May 28 ever in San Marcos?
The coldest May 28 in San Marcos, CA dropped to 43°F in 2003. That is 13°F below the long-term average low of 56°F.
What is the average temperature on May 28 in San Marcos?
On May 28, San Marcos averages a high of 78°F and a low of 56°F based on 55 years of NOAA weather observations from ESCONDIDO #2.
How many years of weather data are available for May 28 in San Marcos?
We have 55 years of weather records for May 28 in San Marcos, 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 28 Weather History in San Marcos
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 73°F | 59°F | 0" | -- |
| 2024 | 79°F | 57°F | 0" | -- |
| 2023 | 71°F | 58°F | 0" | -- |
| 2022 | 71°F | 59°F | 0" | -- |
| 2021 | 79°F | 55°F | 0" | -- |
| 2020 | 86°F | 63°F | 0" | -- |
| 2019 | 75°F | 49°F | 0" | -- |
| 2018 | 80°F | 59°F | 0" | -- |
| 2017 | 78°F | 52°F | 0" | -- |
| 2016 | 78°F | 60°F | 0" | -- |
| 2015 | 79°F | 59°F | 0" | -- |
| 2014 | 85°F | 61°F | 0" | -- |
| 2013 | 79°F | 60°F | 0" | -- |
| 2012 | 78°F | 54°F | 0" | -- |
| 2011 | 72°F | 56°F | 0" | -- |
| 2010 | 65°F | 55°F | 0" | -- |
| 2009 | 62°F | 60°F | 0" | -- |
| 2008 | 65°F | 53°F | 0" | -- |
| 2007 | 65°F | 57°F | 0" | -- |
| 2006 | 70°F | 56°F | 0" | -- |
| 2005 | 79°F | 52°F | 0" | -- |
| 2004 | 73°F | 58°F | 0" | -- |
| 2003 | 95°F | 43°F | 0" | -- |
| 2002 | 80°F | 53°F | 0" | -- |
| 2001 | 67°F | 58°F | 0.56" | -- |
| 2000 | 97°F | 61°F | 0" | -- |
| 1999 | 83°F | 52°F | 0" | -- |
| 1998 | 75°F | 50°F | 0" | -- |
| 1997 | 97°F | 60°F | 0" | -- |
| 1996 | 76°F | 57°F | 0" | -- |
| 1995 | 75°F | 56°F | 0" | -- |
| 1994 | 82°F | 52°F | 0" | -- |
| 1993 | 77°F | 58°F | 0" | -- |
| 1992 | 77°F | 60°F | 0" | -- |
| 1991 | 72°F | 54°F | 0" | -- |
| 1990 | 72°F | 54°F | 2.03" | -- |
| 1989 | 74°F | 55°F | 0" | -- |
| 1988 | 73°F | 58°F | 0" | -- |
| 1987 | 70°F | 53°F | 0" | -- |
| 1986 | 83°F | 58°F | 0" | -- |
| 1985 | 76°F | 52°F | 0" | -- |
| 1984 | 97°F | 55°F | 0" | -- |
| 1983 | 85°F | 61°F | 0" | -- |
| 1982 | 74°F | 57°F | 0" | -- |
| 1981 | 78°F | 59°F | 0" | -- |
| 1980 | 72°F | 46°F | 0" | -- |
| 1979 | 71°F | 58°F | 0" | -- |
| 1978 | 93°F | 52°F | 0" | -- |
| 1977 | 75°F | 56°F | 0" | -- |
| 1976 | 69°F | 56°F | 0.1" | -- |
| 1975 | 77°F | 54°F | 0" | -- |
| 1974 | 80°F | 57°F | 0" | -- |
| 1973 | 101°F | 57°F | 0" | -- |
| 1972 | 91°F | 61°F | 0" | -- |
| 1971 | 65°F | 46°F | 2.01" | -- |
Based on 55 years of data from NOAA station: ESCONDIDO #2
Monthly Climate Averages
Historical temperature and precipitation averages for San Marcos, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.