San Marcos climate

Typical historical weather for San Marcos, United States, averaged across 10 years of hourly climate data. Pick a date for a specific day.

Want today's actual conditions instead? See the current forecast for San Marcos.

Annual average

17.6°C

across all months

Warmest month

28.5°C

Aug average high

Coolest month

8.6°C

Jan average low

Annual rainfall

425mm

total per year

Monthly averages

Average daily high/low temperature (band) and monthly rainfall (bars).

● Avg high● Avg low▮ Rainfall

Records on file

Hottest day

40.1°C

6 July 2018

Coldest day

2.6°C

5 February 2020

Wettest day

66.6mm

14 February 2019

Windiest day

6.9m/s

22 February 2023