San Marcos, TX Weather & Climate Normals
San Marcos's real weather, in one number
San Marcos, TX scores 48/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 4 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
San Marcos's hottest and coldest months
San Marcos's hottest month is Aug, averaging 85°F; its coldest is Jan, averaging 51°F, a 34.7°F swing across the year, a middling gap by national standards.
San Marcos's weather across the year
| Month | Avg high | Avg low | Precip | Snow |
|---|---|---|---|---|
| Jan | 62°F | 39°F | 2.41in | 0in |
| Feb | 67°F | 42°F | 1.73in | 0in |
| Mar | 73°F | 50°F | 2.76in | 0in |
| Apr | 80°F | 56°F | 3.2in | 0in |
| May | 86°F | 65°F | 4.53in | 0in |
| Jun | 92°F | 72°F | 3.57in | 0in |
| Jul | 96°F | 73°F | 2.21in | 0in |
| Aug | 97°F | 74°F | 2.6in | 0in |
| Sep | 91°F | 69°F | 4.03in | 0in |
| Oct | 82°F | 58°F | 4.41in | 0in |
| Nov | 72°F | 48°F | 2.69in | 0in |
| Dec | 64°F | 41°F | 2.41in | 0in |
Mar, Apr, Oct, and Nov are the best time to see San Marcos at its mildest; the rest of the year, plan around Aug's heat and Jan's cold.
Rain and snow in San Marcos
San Marcos averages 36.55in of precipitation a year across roughly 80 days with measurable rain or snow, and 0in of snow a year.
Where San Marcos ranks
San Marcos ranks 2304 of 4876 US cities in this dataset for comfort score, and 309 of 384 within TX. About 74,316 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from San Marcos, TX US, 1.0 miles from San Marcos, not a prediction for any specific day.
More on how this is worked out
How the comfort score is calculated · Why some cities show no snow or rain figure