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Round Rock, TX Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Round Rock, TX?
Round Rock, TX gets 37.1 in of precipitation a year over about 78 rainy days. August is the warmest month (average high 97°F) and January the coldest (average low 38°F).
Humid subtropical climate
Round Rock, TX has hot summers and mild winters. Daytime highs range from about 61°F in January to 97°F in August. October is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically February to April and November, when daytime highs sit near 72°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 39° | 62° |
| Spring | Mar–May | 56° | 79° |
| Summer | Jun–Aug | 72° | 95° |
| Autumn | Sep–Nov | 57° | 80° |
How much rain does Round Rock get?
Round Rock gets 37.1 in of precipitation in an average year, spread over about 78 days with measurable rain. That is fewer rainy days than 60% of the US.
October is the wettest month, with 4.6 in. February is the driest, with 2.0 in. May has the most rainy days, about 8.
The longest dry spell in the last five years lasted 59 days, to November 4, 2024.
From September 2025 to August 2026 Round Rock got 28.5 in of rain, against a normal of 37.1 in for those months. May 2026 had the most, with 6.6 in.
See where Round Rock ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Texas.
Does it snow in Round Rock?
The snowiest winter on record is 1984–85, with 8.7 in.
The most recent measurable snow at the station fell on January 25, 2026.
From September 2025 to August 2026 the station measured 0.6 in of snow. January 2026 had the most, with 0.6 in.
See where Round Rock ranks: snowiest cities in the US.
Round Rock weather by month
Round Rock weather in January
In January, Round Rock averages a high of 61°F and a low of 38°F. It gets 2.6 in of precipitation over about 7 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The January record high is 82°F (2009) and the record low is 14°F (2010).
Round Rock weather in February
In February, Round Rock averages a high of 65°F and a low of 41°F. It gets 2.0 in of precipitation over about 7 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The February record high is 92°F (2008) and the record low is 4°F (2021). February is one of the most comfortable months to visit.
Round Rock weather in March
In March, Round Rock averages a high of 73°F and a low of 49°F. It gets 3.0 in of precipitation over about 8 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The March record high is 95°F (2008) and the record low is 20°F (2014). March is one of the most comfortable months to visit.
Round Rock weather in April
In April, Round Rock averages a high of 79°F and a low of 55°F. It gets 2.3 in of precipitation over about 7 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The April record high is 95°F (2020) and the record low is 35°F (2009). April is one of the most comfortable months to visit.
Round Rock weather in May
In May, Round Rock averages a high of 85°F and a low of 64°F. It gets 4.1 in of precipitation over about 8 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The May record high is 100°F (2011) and the record low is 42°F (2013).
Round Rock weather in June
In June, Round Rock averages a high of 93°F and a low of 71°F. It gets 4.4 in of precipitation over about 7 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The June record high is 107°F (2012) and the record low is 59°F (2013).
Round Rock weather in July
In July, Round Rock averages a high of 96°F and a low of 73°F. It gets 2.8 in of precipitation over about 5 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The July record high is 108°F (2018) and the record low is 61°F (2019).
Round Rock weather in August
In August, Round Rock averages a high of 97°F and a low of 73°F. It gets 2.3 in of precipitation over about 4 rainy days. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. The August record high is 110°F (2023) and the record low is 62°F (2010).
Round Rock weather in September
In September, Round Rock averages a high of 90°F and a low of 68°F. It gets 3.4 in of precipitation over about 6 rainy days. Estimated sunshine is 61% of daylight hours, derived from ERA5 cloud cover. The September record high is 108°F (2023) and the record low is 50°F (2010).
Round Rock weather in October
In October, Round Rock averages a high of 81°F and a low of 57°F. It gets 4.6 in of precipitation over about 6 rainy days. Estimated sunshine is 62% of daylight hours, derived from ERA5 cloud cover. The October record high is 100°F (2024) and the record low is 32°F (2019).
Round Rock weather in November
In November, Round Rock averages a high of 69°F and a low of 47°F. It gets 2.8 in of precipitation over about 6 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The November record high is 89°F (2025) and the record low is 26°F (2018). November is one of the most comfortable months to visit.
Round Rock weather in December
In December, Round Rock averages a high of 61°F and a low of 40°F. It gets 2.8 in of precipitation over about 7 rainy days. Estimated sunshine is 50% of daylight hours, derived from ERA5 cloud cover. The December record high is 86°F (2024) and the record low is 12°F (2022).
Sunshine, humidity and wind in Round Rock
October is the sunniest month in Round Rock, with estimated sunshine of 62% of daylight hours from ERA5 cloud cover. May is the cloudiest, at 36%. The annual cloud-cover estimate is 50% of daylight hours; it is not a measurement of sunshine duration. Round Rock is sunnier than 62% of the US.
Humidity peaks in May at 70% and is lowest in August at 55%.
Round Rock has about 116 days a year above 90°F. Round Rock is hotter than 97% of the US.
Thunderstorms occur on about 38 days a year.
See where Round Rock ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Round Rock
The first fall freeze in Round Rock typically comes around November 27, and the last spring freeze around March 3. That leaves a frost-free growing season of about 269 days.
Round Rock weather records
These records cover AUSTIN GREAT HILLS during 2005–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Round Rock station is 110°F, on August 30, 2011. The coldest is 4°F, on February 16, 2021.
The wettest day in the available station history brought 10.1 in of precipitation, on September 8, 2010.
The best time to visit Round Rock
The most comfortable time to visit is typically February to April and November, when daytime highs sit near 72°F.
Winter (December–February) is mild, with average highs around 62°F and lows near 39°F. Snow is possible.
Spring (March–May) is warm, with average highs around 79°F and lows near 56°F.
Summer (June–August) is hot, with average highs around 95°F and lows near 72°F.
Autumn (September–November) is warm, with average highs around 80°F and lows near 57°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | 38° | 61° | 2.6 in | 7 | 60% | 54% | 82° | 14° |
| February | 41° | 65° | 2.0 in | 7 | 63% | 46% | 92° | 4° |
| March | 49° | 73° | 3.0 in | 8 | 60% | 40% | 95° | 20° |
| April | 55° | 79° | 2.3 in | 7 | 63% | 41% | 95° | 35° |
| May | 64° | 85° | 4.1 in | 8 | 70% | 36% | 100° | 42° |
| June | 71° | 93° | 4.4 in | 7 | 62% | 54% | 107° | 59° |
| July | 73° | 96° | 2.8 in | 5 | 58% | 50% | 108° | 61° |
| August | 73° | 97° | 2.3 in | 4 | 55% | 56% | 110° | 62° |
| September | 68° | 90° | 3.4 in | 6 | 58% | 61% | 108° | 50° |
| October | 57° | 81° | 4.6 in | 6 | 56% | 62% | 100° | 32° |
| November | 47° | 69° | 2.8 in | 6 | 65% | 50% | 89° | 26° |
| December | 40° | 61° | 2.8 in | 7 | 64% | 50% | 86° | 12° |
Station: AUSTIN GREAT HILLS, 13 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 2005–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Round Rock climate questions
How much rain does Round Rock get?
Round Rock gets 37.1 in of precipitation in an average year, over about 78 rainy days.
What is the wettest month in Round Rock?
October is the wettest month in Round Rock, with 4.6 in. February is the driest, with 2.0 in.
How many rainy days does Round Rock have a year?
Round Rock has about 78 days with measurable rain in an average year. May has the most, about 8.
What is the hottest month in Round Rock?
August is the warmest month in Round Rock, with an average high of 97°F.
What is the coldest month in Round Rock?
January is the coldest month in Round Rock, with an average low of 38°F.
What is the record high temperature in Round Rock?
Within the available 2005–2026 station history, the record high at the Round Rock station is 110°F, set on August 30, 2011. The record low is 4°F, on February 16, 2021.
What is the sunniest month in Round Rock?
October is the sunniest month in Round Rock, with estimated sunshine of 62% of daylight hours from ERA5 cloud cover. May is the cloudiest.
When is the first frost in Round Rock?
The first fall freeze in Round Rock typically comes around November 27. The last spring freeze is around March 3.
What is the best time to visit Round Rock?
The most comfortable time to visit is typically February to April and November, when daytime highs sit near 72°F.