San Marcos climate

San Marcos Weather in August

NOAA 1991-2020 normals for San Marcos, 0.8 km from San Marcos

Average highs run from 98°F on August 1 to 94°F on August 31, and lows from 74°F to 72°F. Normal precipitation for the month is 2.60 in over about 5 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at San Marcos, in °F, with the record for each date.406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
97°F
Average low
74°F
Precipitation
2.60 in
Record high
111°FAug 23, 1917
Record low
50°FAug 29, 2010
Chance of a freeze
0%
Days of 90°F or more
28.6
Daylight
13 h 34 min to 12 h 47 min
Cloud cover
42%
Humidity
61%
Dew point
67°F
Wind
8.5 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 198°F74°F105°F 192261°F 193614%0%
Aug 298°F74°F106°F 192361°F 193614%0%
Aug 398°F74°F107°F 192260°F 192514%0%
Aug 498°F74°F108°F 192261°F 192514%0%
Aug 598°F74°F107°F 201157°F 201014%0%
Aug 698°F74°F107°F 192462°F 197314%0%
Aug 798°F74°F108°F 192264°F 201014%0%
Aug 898°F74°F107°F 192461°F 201014%0%
Aug 998°F74°F108°F 202359°F 201014%0%
Aug 1098°F74°F109°F 194759°F 201015%0%
Aug 1198°F74°F110°F 193660°F 201015%0%
Aug 1298°F74°F108°F 196960°F 201015%0%
Aug 1398°F74°F109°F 192559°F 193115%0%
Aug 1498°F74°F107°F 192357°F 196716%0%
Aug 1597°F74°F106°F 192560°F 196716%0%
Aug 1697°F74°F107°F 192559°F 201016%0%
Aug 1797°F74°F108°F 192358°F 201017%0%
Aug 1897°F74°F107°F 192358°F 201017%0%
Aug 1997°F74°F108°F 192459°F 201017%0%
Aug 2097°F74°F107°F 191760°F 201018%0%
Aug 2197°F74°F108°F 192458°F 194018%0%
Aug 2296°F74°F108°F 191757°F 201019%0%
Aug 2396°F74°F111°F 191755°F 194919%0%
Aug 2496°F73°F107°F 192456°F 194919%0%
Aug 2596°F73°F108°F 192459°F 194920%0%
Aug 2696°F73°F107°F 192258°F 194920%0%
Aug 2795°F73°F109°F 192355°F 201020%0%
Aug 2895°F73°F106°F 201154°F 201021%0%
Aug 2995°F73°F106°F 194350°F 201021%0%
Aug 3095°F73°F109°F 201157°F 201022%0%
Aug 3194°F72°F108°F 192360°F 191522%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at San Marcos, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 6:51 AM, sunset 8:25 PM
August 31
sunrise 7:08 AM, sunset 7:55 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00417983 (San Marcos), public domain. Records: NOAA GHCN-Daily, station USC00417983, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.