See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
28°
Mostly Cloudy
Feels Like: 33°
Min: 24°
Max: 31°
The next few hours will be humid and overcast, with today reaching 31°C and dropping to 24°C. The coming days will be drizzle
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:29
Sunrise
18:30
Sunset
Moon
Waxing Gibbous
14:39
Moonrise
01:03
Moonset
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View stargazing scoreWeather in San Marcos today, September 20, 2026
San Marcos starts September 20, 2026 looking damp, with rain in the forecast and wetter spells likely at times. Waterproof kit is the safer call for early plans. Expect a grey start, with morning cloud around 85% by 09:00. Outdoor plans early on should not rely on bright skies.
Expect highs of 31°C and cooler readings close to 24°C. Expect humidity between 64% and 87%, most humid near 09:00. Expect gentle winds, highest near 15:00 at 4.6 km/h.
The second half of the day still looks unsettled, with rain probability around 44% by 13:00. Dense cloud near 99% at 23:00 keeps the feel grey. Expect visibility around 16.1 km. Daylight runs from 06:29 to 18:30, lasting 12 hours 0 minutes of sunlight today.
The practical takeaway for San Marcos on September 20, 2026 is simple: plan for rain, keep layers handy, and work around a high of about 31°C.
Frequently asked questions about weather in San Marcos
How warm does it get in San Marcos?
The warmest month in San Marcos is May, with average high temperatures of 35°C. The average temperature during this period is around 29°C.
How cold does it get in San Marcos?
The coldest month in San Marcos is January, with average low temperatures of 22°C. The average temperature during this period is around 27°C.
What is the wettest time of year in San Marcos?
The wettest month in San Marcos is September, with an average of 354mm of precipitation.
What is the driest time of year in San Marcos?
The driest month in San Marcos is February, with an average of 1mm of precipitation.
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