Round Rock, Texas Weather
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Climate of Round Rock: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), August is usually the hottest month in Round Rock, with average daytime highs around 36°C. January is the coolest, when nights typically fall to about 3°C. That is a wide yearly range of roughly 33°C, so the seasons feel very different from each other.
The area receives about 840 mm of rain in a typical year. Most of it falls from May, and May is the wettest month at roughly 111 mm.
For outdoor plans and travel, March to April and October to November usually offer the most comfortable weather in Round Rock, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | 16° | 3° | 58 mm | 72% |
| Feb | 18° | 5° | 45 mm | 73% |
| Mar | 23° | 9° | 73 mm | 73% |
| Apr | 27° | 14° | 63 mm | 70% |
| May | 30° | 18° | 111 mm | 71% |
| Jun | 34° | 22° | 78 mm | 66% |
| Jul | 36° | 24° | 60 mm | 64% |
| Aug | 36° | 24° | 63 mm | 60% |
| Sep | 32° | 21° | 87 mm | 67% |
| Oct | 28° | 15° | 95 mm | 68% |
| Nov | 21° | 9° | 59 mm | 71% |
| Dec | 17° | 4° | 49 mm | 72% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Round Rock. Values describe typical conditions, not a forecast.
About Round Rock weather
Round Rock is one of many towns in Texas's vast Gulf Coast-to-arid-west range — humid subtropical in the east, semi-arid to desert further west, about 28 km north of Austin. Before the rains arrive, there's long, hot summers (June–September) with highs regularly above 35°C, more humid near the Gulf coast. Cooler months mean mild winters across most of the state, with occasional cold snaps and rare snow. This page shows live, auto-refreshing weather for Round Rock: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Round Rock is about 28 km north of Austin, in Texas.
Round Rock sees mild winters across most of the state, with occasional cold snaps and rare snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Round Rock's exact coordinates. No fixed schedule, the page updates whenever you load it.
August is usually the hottest month in Round Rock, with average daytime highs of about 36°C and nights around 24°C.
The coldest nights come in January, when the average low is about 3°C and daytime highs reach around 16°C.
Round Rock receives about 840 mm of rain in a typical year. May is the wettest month at roughly 111 mm, the only month that averages more than 100 mm.
March to April and October to November usually offer the most comfortable weather in Round Rock, with mild daytime temperatures and little rain.
In November Round Rock typically sees daytime highs near 21°C and lows near 9°C, with about 59 mm of rain over the month and average humidity around 71%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
Live temperature for Round Rock is shown at the top of this page and refreshes automatically — see the hourly breakdown below for how it changes through the day.
Round Rock's day-to-day weather follows the broader pattern of Texas described above. See the hourly weather forecast or the air quality index for more detail.