Climate San Marcos - Texas
| JanJa | FebFe | MarMa | AprAp | MayMa | JunJu | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 62 | 66 | 73 | 80 | 86 | 91 |
| Average low in ºF Av. low Lo | 39 | 42 | 49 | 57 | 65 | 72 |
| Av. precipitation in inch Av. precip. Pre. | 2.06 | 1.92 | 2.48 | 2.72 | 4.13 | 4.64 |
| JulJu | AugAu | SepSe | OctOc | NovNo | DecDe | |
|---|---|---|---|---|---|---|
| Average high in ºF Av. high Hi | 94 | 96 | 90 | 82 | 72 | 63 |
| Average low in ºF Av. low Lo | 74 | 74 | 68 | 58 | 49 | 40 |
| Av. precipitation in inch Av. precip. Pre. | 2.50 | 2.19 | 3.42 | 4.33 | 3.05 | 2.29 |
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 Climate Graph - Texas Climate Chart
Daily normals San Marcos - Texas - January
Day | High ºF | Low ºF | Prec/mo inch | Prec/yr inch | Snow/mo inch | Snow/yr inch |
|---|---|---|---|---|---|---|
| 1 Jan | 61.6 | 38.7 | 0.09 | 0.09 | 0.00 | 0.00 |
| 2 Jan | 61.6 | 38.6 | 0.18 | 0.18 | 0.00 | 0.00 |
| 3 Jan | 61.6 | 38.6 | 0.27 | 0.27 | 0.00 | 0.00 |
| 4 Jan | 61.5 | 38.6 | 0.35 | 0.35 | 0.00 | 0.00 |
| 5 Jan | 61.5 | 38.5 | 0.43 | 0.43 | 0.00 | 0.00 |
| 6 Jan | 61.5 | 38.5 | 0.50 | 0.50 | 0.00 | 0.00 |
| 7 Jan | 61.5 | 38.5 | 0.58 | 0.58 | 0.00 | 0.00 |
| 8 Jan | 61.5 | 38.5 | 0.65 | 0.65 | 0.00 | 0.00 |
| 9 Jan | 61.6 | 38.5 | 0.73 | 0.73 | 0.00 | 0.00 |
| 10 Jan | 61.6 | 38.5 | 0.80 | 0.80 | 0.00 | 0.00 |
| 11 Jan | 61.7 | 38.5 | 0.89 | 0.89 | 0.00 | 0.00 |
| 12 Jan | 61.7 | 38.5 | 0.97 | 0.97 | 0.00 | 0.00 |
| 13 Jan | 61.8 | 38.6 | 1.05 | 1.05 | 0.00 | 0.00 |
| 14 Jan | 61.8 | 38.6 | 1.13 | 1.13 | 0.00 | 0.00 |
| 15 Jan | 61.9 | 38.6 | 1.22 | 1.22 | 0.00 | 0.00 |
| 16 Jan | 62.0 | 38.7 | 1.30 | 1.30 | 0.00 | 0.00 |
| 17 Jan | 62.1 | 38.7 | 1.38 | 1.38 | 0.00 | 0.00 |
| 18 Jan | 62.2 | 38.8 | 1.45 | 1.45 | 0.00 | 0.00 |
| 19 Jan | 62.3 | 38.8 | 1.53 | 1.53 | 0.00 | 0.00 |
| 20 Jan | 62.4 | 38.9 | 1.61 | 1.61 | 0.00 | 0.00 |
| 21 Jan | 62.5 | 39.0 | 1.69 | 1.69 | 0.00 | 0.00 |
| 22 Jan | 62.7 | 39.0 | 1.77 | 1.77 | 0.00 | 0.00 |
| 23 Jan | 62.8 | 39.1 | 1.84 | 1.84 | 0.00 | 0.00 |
| 24 Jan | 62.9 | 39.2 | 1.92 | 1.92 | 0.00 | 0.00 |
| 25 Jan | 63.1 | 39.3 | 1.99 | 1.99 | 0.00 | 0.00 |
| 26 Jan | 63.2 | 39.4 | 2.06 | 2.06 | 0.00 | 0.00 |
| 27 Jan | 63.4 | 39.5 | 2.13 | 2.13 | 0.00 | 0.00 |
| 28 Jan | 63.5 | 39.6 | 2.21 | 2.21 | 0.00 | 0.00 |
| 29 Jan | 63.7 | 39.7 | 2.28 | 2.28 | 0.00 | 0.00 |
| 30 Jan | 63.8 | 39.8 | 2.35 | 2.35 | 0.00 | 0.00 |
| 31 Jan | 64.0 | 39.9 | 2.41 | 2.41 | 0.00 | 0.00 |
Weather history San Marcos - September 2026
| Day | High ºF | Low ºF | Precip. inch | Snow inch | Snow d. inch |
|---|---|---|---|---|---|
| 01 Sep | 100.9 | 77.0 | 0.00 | - | - |
| 02 Sep | - | - | - | - | - |
| 03 Sep | - | - | - | - | - |
| 04 Sep | - | - | - | - | - |
| 05 Sep | - | - | - | - | - |
| 06 Sep | - | - | - | - | - |
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| 11 Sep | - | - | - | - | - |
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| 28 Sep | - | - | - | - | - |
| 29 Sep | - | - | - | - | - |
| 30 Sep | - | - | - | - | - |
Past weather San Marcos
| Sep 26 | Normal | ||
|---|---|---|---|
| Average high temperature Av. high temp. | 100.9 ºF | 62 ºF | |
| Average low temperature Av. low temp. | 77.0 ºF | 39 ºF | |
| Total precipitation Total precip. | 0.00 inch | 2.06 inch | |
| Total snowfall Total snowfall | - inch | 0 inch | |
| Highest max temperature Highest max temp. | 100.9 ºF | - | |
| Lowest max temperature Lowest max temp. | 100.9 ºF | - | |
| Highest min temperature Highest min temp. | 77.0 ºF | - | |
| Lowest min temperature Lowest min temp. | 77.0 ºF | - | |
Past weather September 2026 incomplete - Missing data
Geo San Marcos - Texas
| Country | United States | |
|---|---|---|
| State | Texas | |
| County | Caldwell | |
| City | San Marcos | |
| Zip Code | 78666 | |
| Longitude | -97.86 dec. degr. | |
| Latitude | 29.89 dec. degr. | |
| Altitude - Elevation | 584ft | |
| ICAO | - | |
| IATA | - |
Date and Time San Marcos - Texas
| Local Time | 03:45 PM | |
|---|---|---|
| Sunrise | 07:14 AM | |
| Sunset | 07:39 PM | |
| Day/Night | Day | |
| Timezone | Central Daylight Time | |
| Timezone DB | America - Chicago |
Map of San Marcos - Texas
USGS National Map — Open interactive map
San Marcos weather averages
| Annual high temperature | 80ºF |
| Annual low temperature | 57ºF |
| Average annual precip. | 35.73 inch |
Station Data
Monthly averages San Marcos
Longitude: -97.863, Latitude: 29.8927
Average weather San Marcos, TX - 78666
Monthly: 1991-2020 normals
History: 2007-2026
Abbreviations
Average precipitation in : Av. precipitation in
Jan: January, Feb: February, ...Jan: January, Feb: February, ...Ja: January, Fe: February, ...