Yosemite National Park is definitely worth a visit
Vast forests, blue lakes, towering sequoias, and majestic waterfalls hint at the beauty of Yosemite National Park—a true natural masterpiece.
San Marcos Weather in September
September in San Marcos brings very high temperatures, with highs of 33°C (91°F) and nights dropping to 20°C (68°F). Rainfall is on the higher side this month, averaging around 110 mm (4.3 in), so keep a rain jacket handy.
Rainfall in San Marcos in September
Historically, the month has about 10 days of rain, averaging 110 mm (4.3 in) in total. When it rains this month, it tends to come down fairly heavily. Showers can be substantial even if they don't last all day.
Temperature in San Marcos in September
Daytime temperatures in San Marcos reach 33°C (91°F) in September, dropping to 20°C (68°F) at night. Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. With overnight lows of 20°C (68°F), evenings stay pleasantly warm.
Sunshine in San Marcos in September
There are approximately 234 hours of sunshine this month, resulting in mostly clear days.September in San Marcos can still be great, but if you prefer pleasant temperatures along with dry and sunny conditions, our weather planner can help you explore other options in the world.
San Marcos Temperature in September
Min Temperature
20°C (68°F)
Max Temperature
33°C (91°F)
Chance of Rain
32%
Precipitation
110 mm (4.3 in)
Rainy days
10 days
Humidity
68% *
Sunshine
234 hours *
Percentage Sunshine
63% *
* Data from: Austin, the United States of America (51 KM, 32 Miles).
San Marcos Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Marcos - and find the best time to visit.
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in San Marcos in September
Warm but pleasant conditions in San Marcos in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in San Marcos in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming9/10 -
Cycling7/10 -
Walking7/10 -
Camping6/10 -
Outdoor sports7/10
San Marcos 3-Day Forecast
More climate data for San Marcos
Temperature Rainfall Sunshine Humidity
See the full San Marcos climate overview or explore weather in the United States of America.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Yosemite National Park is definitely worth a visit
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