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San Marcos, CA weather and climate

San Diego County, CA · population 94,078 · about 636 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at San Marcos's own coordinates.

The year at a glance

Sunny days
276
clear or partly cloudy, per year
Precipitation
15 in
per year
Wet days
38
rain or snow per year
Snowfall
0 in
per year
Hot days
32
above 90 °F
Freezing nights
1
at or below 32 °F
Humidity
73%
average relative
Average temperature
64 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
6080JanMarMayJulSepNovDaily high, Jan: 67 °FDaily high, Feb: 67 °FDaily high, Mar: 68 °FDaily high, Apr: 71 °FDaily high, May: 73 °FDaily high, Jun: 77 °FDaily high, Jul: 82 °FDaily high, Aug: 84 °FDaily high, Sep: 82 °FDaily high, Oct: 78 °FDaily high, Nov: 73 °FDaily high, Dec: 66 °FDaily low, Jan: 46 °FDaily low, Feb: 47 °FDaily low, Mar: 49 °FDaily low, Apr: 52 °FDaily low, May: 56 °FDaily low, Jun: 60 °FDaily low, Jul: 64 °FDaily low, Aug: 65 °FDaily low, Sep: 63 °FDaily low, Oct: 58 °FDaily low, Nov: 50 °FDaily low, Dec: 45 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high676768717377828482787366
Daily low464749525660646563585045

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.01.02.03.0JanMarMayJulSepNovSan Marcos, Jan: 2.9 inSan Marcos, Feb: 3.6 inSan Marcos, Mar: 2.2 inSan Marcos, Apr: 1.1 inSan Marcos, May: 0.5 inSan Marcos, Jun: 0.1 inSan Marcos, Jul: 0.1 inSan Marcos, Aug: 0.0 inSan Marcos, Sep: 0.2 inSan Marcos, Oct: 0.7 inSan Marcos, Nov: 1.1 inSan Marcos, Dec: 2.1 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
San Marcos2.93.62.21.10.50.10.10.00.20.71.12.1

Monthly sunny days

Days each month with clear or partly cloudy skies.

0102030JanMarMayJulSepNovSan Marcos, Jan: 20 daysSan Marcos, Feb: 17 daysSan Marcos, Mar: 19 daysSan Marcos, Apr: 21 daysSan Marcos, May: 21 daysSan Marcos, Jun: 25 daysSan Marcos, Jul: 28 daysSan Marcos, Aug: 30 daysSan Marcos, Sep: 27 daysSan Marcos, Oct: 25 daysSan Marcos, Nov: 23 daysSan Marcos, Dec: 20 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
San Marcos201719212125283027252320

Compare San Marcos with another city

Nearby cities and popular picks. Any two cities can be compared from the home page.

See weather for every covered California city

About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).