San Marcos weather in October: San Marcos, Texas: normal highs, lows, rain and records for October
San Marcos in October has a normal high of 82°F and a normal low of 58°F, a daily mean of 70°F, falling from 87°F on the 1st to 77°F by the 31st. Measurable precipitation falls on 6 days in a normal October, 4.41 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 28°C and low of 15°C, 112 mm of precipitation in October.
- NOAA stationSan Marcos
- Station IDUSC00417983
- Location29.88°N 97.95°W
- Elevation665 ft (203 m)
- Population74,316
- Jan 62° 39°
- Feb 67° 42°
- Mar 73° 50°
- Apr 80° 56°
- May 86° 65°
- Jun 92° 72°
- Jul 96° 73°
- Aug 97° 74°
- Sep 91° 69°
- Oct 82° 58°
- Nov 72° 48°
- Dec 64° 41°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is San Marcos in October?
The normal high is 82°F and the normal low 58°F, for a daily mean of 70.1°F. October is 9.4°F cooler than September and 10.2°F warmer than November. October is the 6th warmest month of the year in San Marcos and the 2nd wettest. Across the month the normal high falls 10°F, from 87°F on October 1 to 77°F on October 31. From one year to the next October's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Octobers in three average between 68°F and 72°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 21%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| October 1 | 87°F | 64°F | 20% | 14% |
| October 8 | 85°F | 61°F | 20% | 13% |
| October 15 | 83°F | 58°F | 20% | 13% |
| October 22 | 80°F | 56°F | 20% | 12% |
| October 31 | 77°F | 53°F | 21% | 12% |
Every day of October: normal high, low and chance of precipitation (warmest afternoon October 1, coldest night October 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| October 1 | 87°F | 64°F | 20% | 14% | 11 h 50 min |
| October 2 | 86°F | 63°F | 20% | 14% | 11 h 50 min |
| October 3 | 86°F | 63°F | 20% | 13% | 11 h 50 min |
| October 4 | 86°F | 62°F | 20% | 13% | 11 h 50 min |
| October 5 | 86°F | 62°F | 20% | 13% | 11 h 50 min |
| October 6 | 85°F | 62°F | 20% | 13% | 11 h 50 min |
| October 7 | 85°F | 61°F | 20% | 13% | 11 h 40 min |
| October 8 | 85°F | 61°F | 20% | 13% | 11 h 40 min |
| October 9 | 84°F | 61°F | 20% | 13% | 11 h 40 min |
| October 10 | 84°F | 60°F | 20% | 13% | 11 h 40 min |
| October 11 | 84°F | 60°F | 20% | 13% | 11 h 40 min |
| October 12 | 84°F | 60°F | 20% | 13% | 11 h 30 min |
| October 13 | 83°F | 59°F | 20% | 13% | 11 h 30 min |
| October 14 | 83°F | 59°F | 20% | 13% | 11 h 30 min |
| October 15 | 83°F | 58°F | 20% | 13% | 11 h 30 min |
| October 16 | 82°F | 58°F | 20% | 13% | 11 h 30 min |
| October 17 | 82°F | 58°F | 20% | 13% | 11 h 30 min |
| October 18 | 82°F | 57°F | 20% | 13% | 11 h 20 min |
| October 19 | 81°F | 57°F | 20% | 13% | 11 h 20 min |
| October 20 | 81°F | 57°F | 20% | 13% | 11 h 20 min |
| October 21 | 81°F | 56°F | 20% | 12% | 11 h 20 min |
| October 22 | 80°F | 56°F | 20% | 12% | 11 h 20 min |
| October 23 | 80°F | 56°F | 20% | 12% | 11 h 20 min |
| October 24 | 80°F | 55°F | 20% | 12% | 11 h 10 min |
| October 25 | 79°F | 55°F | 20% | 12% | 11 h 10 min |
| October 26 | 79°F | 55°F | 21% | 12% | 11 h 10 min |
| October 27 | 78°F | 54°F | 21% | 12% | 11 h 10 min |
| October 28 | 78°F | 54°F | 21% | 12% | 11 h 10 min |
| October 29 | 78°F | 54°F | 21% | 12% | 11 h 10 min |
| October 30 | 77°F | 53°F | 21% | 12% | 11 h |
| October 31 | 77°F | 53°F | 21% | 12% | 11 h |
- Normal high
- 82°FOctober average
- Normal low
- 58°FOctober average
- Precipitation
- 4.41 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 5
- Daylight
- 11 h 50 min to 11 hOctober 1 to October 31
- Days at 70°F or more
- 29
- Days at 80°F or more
- 23
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USC00417983; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in San Marcos in October?
On a given October day the chance of 0.01 inch or more is 20% on average, highest around October 29 (21%). In all, 4.41 in falls on 6 days of a normal October, 1 of them with an inch or more.
In a normal October in San Marcos, 5 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USC00417983.
What are the records for October in San Marcos?
The warmest October temperature on this station's record (since 1895) is 101°F, on October 4, 1924; the coldest is 27°F, on October 30, 1917. The wettest October brought 25.31 in (1998).
The October mean against the 1991-2020 normal of 70.1°F: 2021 71.1°F (+1.0), 2022 69.4°F (−0.7), 2023 70.7°F (+0.6), 2024 76.5°F (+6.4), 2025 76.8°F (+6.7). 4 of 5 ran warmer than normal.
| October | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 71.1°F | +1.0°F | 7.53 in |
| 2022 | 69.4°F | −0.7°F | 1.47 in |
| 2023 | 70.7°F | +0.6°F | 7.35 in |
| 2024 | 76.5°F | +6.4°F | 0.00 in |
| 2025 | 76.8°F | +6.7°F | 1.20 in |
Source: records: ACIS, station USC00417983; recent months: ACIS, station USC00417983. Records and recent months use complete months only.
How does October in San Marcos compare across Texas?
Across the 321 places PlainClimate covers in Texas, October normal highs run from 71°F in Channing to 89°F in McAllen; San Marcos's is 82°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.