Round Rock Weather in September

September in Round Rock sees daytime temperatures around 33°C (91°F) and lows of 20°C (68°F) at night. With around 100 mm (3.9 in) of rainfall expected, it's worth packing a rain jacket.

Rainfall in Round Rock in September

Analyzing past climate data, one can expect approximately 8 days of rain, averaging 100 mm (3.9 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.

Temperature in Round Rock in September

Round Rock in September gets highs of 33°C (91°F) during the day and drops 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 can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Round Rock in September

The month enjoys around 234 hours of sunshine, creating mostly sunny days with good weather conditions.

Wind Speed in Round Rock in September

Average wind speeds reach 3 m/s (6 knots) in September, creating light breezes that feel pleasant throughout the day. Some days are calmer, while others bring slightly more active breezes.

If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Round Rock. Our weather planner can help you explore destinations with more pleasant weather conditions.

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For a detailed overview over the year and the best time to visit the United States of America, check out our Round Rock's climate page.

Round Rock Temperature in September

Min Temperature 20°C (68°F)  

Max Temperature 33°C (91°F)  

Chance of Rain 26%  

Precipitation 100 mm (3.9 in)  

Rainy days 8 days  

Humidity 68% *  

Windspeed 3 m/s (6 knots) *  

Sunshine 234 hours *  

Percentage Sunshine 63% *  

* Data from: Austin, the United States of America (23 KM, 14 Miles).

What to Wear in Round Rock in September

Warm but pleasant conditions in Round Rock 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. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.

What To Do in Round Rock in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

8/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Round Rock's climate page.

More climate data for Round Rock

Temperature Rainfall Sunshine Humidity Wind Speed

See the full Round Rock climate overview or explore weather in the United States of America.