Humid subtropical climate
Climate San Marcos - Texas
Annual high80ºF
Annual low57ºF
Precipitation35.73 inch
| Month | HighºF | LowºF | Precipinch |
|---|---|---|---|
| Jan | 62 | 39 | 2.06 |
| Feb | 66 | 42 | 1.92 |
| Mar | 73 | 49 | 2.48 |
| Apr | 80 | 57 | 2.72 |
| May | 86 | 65 | 4.13 |
| Jun | 91 | 72 | 4.64 |
| Jul | 94 | 74 | 2.50 |
| Aug | 96 | 74 | 2.19 |
| Sep | 90 | 68 | 3.42 |
| Oct | 82 | 58 | 4.33 |
| Nov | 72 | 49 | 3.05 |
| Dec | 63 | 40 | 2.29 |
- JanHigh 62ºFLow 39ºFPrecip 2.06 inch
- FebHigh 66ºFLow 42ºFPrecip 1.92 inch
- MarHigh 73ºFLow 49ºFPrecip 2.48 inch
- AprHigh 80ºFLow 57ºFPrecip 2.72 inch
- MayHigh 86ºFLow 65ºFPrecip 4.13 inch
- JunHigh 91ºFLow 72ºFPrecip 4.64 inch
- JulHigh 94ºFLow 74ºFPrecip 2.50 inch
- AugHigh 96ºFLow 74ºFPrecip 2.19 inch
- SepHigh 90ºFLow 68ºFPrecip 3.42 inch
- OctHigh 82ºFLow 58ºFPrecip 4.33 inch
- NovHigh 72ºFLow 49ºFPrecip 3.05 inch
- DecHigh 63ºFLow 40ºFPrecip 2.29 inch
Climate summary
What is the average weather in San Marcos, Texas?
San Marcos experiences a humid subtropical climate, characterized by hot summers and cool winters, indicating a strong seasonal contrast. The area is fairly wet overall, with a moderate seasonal pattern that brings wetter conditions in the fall. Heavy seasonal downpours or afternoon thunderstorms can sometimes occur during the warmer months.
San Marcos weather averages
Annual high80ºF
Annual low57ºF
Precipitation35.73 inch
Daily normals San Marcos - Texas - January
| Day | HighºF | LowºF | Prec/ | Prec/ |
|---|---|---|---|---|
| Jan 1 | 61.6 | 38.7 | 0.09 | 0.09 |
| Jan 2 | 61.6 | 38.6 | 0.18 | 0.18 |
| Jan 3 | 61.6 | 38.6 | 0.27 | 0.27 |
| Jan 4 | 61.5 | 38.6 | 0.35 | 0.35 |
| Jan 5 | 61.5 | 38.5 | 0.43 | 0.43 |
| Jan 6 | 61.5 | 38.5 | 0.50 | 0.50 |
| Jan 7 | 61.5 | 38.5 | 0.58 | 0.58 |
| Jan 8 | 61.5 | 38.5 | 0.65 | 0.65 |
| Jan 9 | 61.6 | 38.5 | 0.73 | 0.73 |
| Jan 10 | 61.6 | 38.5 | 0.80 | 0.80 |
| Jan 11 | 61.7 | 38.5 | 0.89 | 0.89 |
| Jan 12 | 61.7 | 38.5 | 0.97 | 0.97 |
| Jan 13 | 61.8 | 38.6 | 1.05 | 1.05 |
| Jan 14 | 61.8 | 38.6 | 1.13 | 1.13 |
| Jan 15 | 61.9 | 38.6 | 1.22 | 1.22 |
| Jan 16 | 62.0 | 38.7 | 1.30 | 1.30 |
| Jan 17 | 62.1 | 38.7 | 1.38 | 1.38 |
| Jan 18 | 62.2 | 38.8 | 1.45 | 1.45 |
| Jan 19 | 62.3 | 38.8 | 1.53 | 1.53 |
| Jan 20 | 62.4 | 38.9 | 1.61 | 1.61 |
| Jan 21 | 62.5 | 39.0 | 1.69 | 1.69 |
| Jan 22 | 62.7 | 39.0 | 1.77 | 1.77 |
| Jan 23 | 62.8 | 39.1 | 1.84 | 1.84 |
| Jan 24 | 62.9 | 39.2 | 1.92 | 1.92 |
| Jan 25 | 63.1 | 39.3 | 1.99 | 1.99 |
| Jan 26 | 63.2 | 39.4 | 2.06 | 2.06 |
| Jan 27 | 63.4 | 39.5 | 2.13 | 2.13 |
| Jan 28 | 63.5 | 39.6 | 2.21 | 2.21 |
| Jan 29 | 63.7 | 39.7 | 2.28 | 2.28 |
| Jan 30 | 63.8 | 39.8 | 2.35 | 2.35 |
| Jan 31 | 64.0 | 39.9 | 2.41 | 2.41 |
Precipitation and snow add up through the month (/mo) and the year (/yr)
Weather history San Marcos - October 2026
| Day | HighºF | LowºF | Precip.inch |
|---|---|---|---|
| Oct 1 | 86.0 | 72.0 | 0.00 |
| Oct 2 | 81.0 | 71.1 | 1.10 |
| Oct 3 | – | – | – |
| Oct 4 | – | – | – |
| Oct 5 | – | – | – |
| Oct 6 | – | – | – |
| Oct 7 | – | – | – |
| Oct 8 | – | – | – |
| Oct 9 | – | – | – |
| Oct 10 | – | – | – |
| Oct 11 | – | – | – |
| Oct 12 | – | – | – |
| Oct 13 | – | – | – |
| Oct 14 | – | – | – |
| Oct 15 | – | – | – |
| Oct 16 | – | – | – |
| Oct 17 | – | – | – |
| Oct 18 | – | – | – |
| Oct 19 | – | – | – |
| Oct 20 | – | – | – |
| Oct 21 | – | – | – |
| Oct 22 | – | – | – |
| Oct 23 | – | – | – |
| Oct 24 | – | – | – |
| Oct 25 | – | – | – |
| Oct 26 | – | – | – |
| Oct 27 | – | – | – |
| Oct 28 | – | – | – |
| Oct 29 | – | – | – |
| Oct 30 | – | – | – |
| Oct 31 | – | – | – |
The data for October 2026 is incomplete: some days or values are missing.
- –No data
- –Not yet observed or received
- TTrace, too small to measure
Observed extremes
- Highest max temperature86.0ºF · Oct 1
- Lowest max temperature81.0ºF · Oct 2
- Highest min temperature72.0ºF · Oct 1
- Lowest min temperature71.1ºF · Oct 2
Geo San Marcos - Texas
Location
- Country
- United States
- State
- Texas
- County
- Caldwell
- City
- San Marcos
- Zip Code
- 78666
- Elevation
- 584 ft
- Longitude
- -97.86
- Latitude
- 29.89
- ICAO
- –
- IATA
- –