See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
25°
Mostly Cloudy
Feels Like: 25°
Min: 15°
Max: 25°
The next few hours will be overcast, with today reaching 25°C and dropping to 14°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
14:46
Moonrise
00:55
Moonset
Daily Forecast
Today
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Air Quality Data Available
Upgrade to access real-time air quality data for San Marcos.
Resources
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for San Marcos.
View stargazing scoreWeather in San Marcos today, September 20, 2026
Expect a muted, overcast feel in San Marcos on September 20, 2026 as cloud persists. Brighter breaks, if they arrive, should stay brief.
The day peaks near 25°C and cools toward 15°C. Relative humidity sits between 43% and 91%, reaching its peak around 23:00. Winds stay light, near 4.4 km/h by 18:00, so the day feels still more than breezy.
Expect the wet theme to continue later, as rain odds reach 20% near 16:00. Cloud amounts hold near 90% around 23:00. Horizontal visibility holds close to 16.1 km. Sunrise is at 06:29 and sunset at 18:30, giving 12 hours 0 minutes of sunlight today.
Overall, San Marcos on September 20, 2026 suits indoor plans or waterproof kit, especially while rain chances stay near 20% and the high sits around 25°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 29°C. The average temperature during this period is around 21°C.
How cold does it get in San Marcos?
The coldest month in San Marcos is January, with average low temperatures of 7°C. The average temperature during this period is around 14°C.
What is the wettest time of year in San Marcos?
The wettest month in San Marcos is September, with an average of 130mm of precipitation.
What is the driest time of year in San Marcos?
The driest month in San Marcos is January, with an average of 9mm of precipitation.
Explore more weather forecasts
- Tula de Allende, Estado de Hidalgo
- Mexico City, Ciudad de México
- El Llano, Estado de Hidalgo
- Tijuana, Estado de Baja California
- Tlaxcoapan, Estado de Hidalgo
- Iztapalapa, Ciudad de México
- Tepeji del Río de Ocampo, Estado de Hidalgo
- León de los Aldama, Estado de Guanajuato
- Mixquiahuala de Juarez, Estado de Hidalgo
- Puebla, Estado de Puebla
- Progreso de Alvaro Obregon, Estado de Hidalgo
- Ecatepec de Morelos, Estado de México
- Tepatepec, Estado de Hidalgo
- Santiago de Querétaro, Estado de Querétaro
- Tizayuca, Estado de Hidalgo
- Ciudad Juárez, Estado de Chihuahua
