Weather on March 21
Round Rock, TX
55 Years of Data
About This Date
March 21st in Round Rock, TX typically brings pleasant spring weather, with average highs around 72°F and lows near 47°F — a 25°F daily swing. Over 56 years of records, the warmest March 21st was in 2026 (73°F average), while the coldest was 2010 (39°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 29% of March 21st dates historically, with the wettest March 21st recording 1.21" of rain. Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for March 21st in Round Rock, TX? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026warmest | 89° | 57° | 73° | — | — |
| 2025 | 70° | 42° | 56° | — | — |
| 2024 | 65° | 52° | 58° | 0.1" | — |
| 2023 | 55° | 43° | 49° | 0.16" | — |
| 2022 | 77° | 45° | 61° | 0.07" | — |
| 2021 | 71° | 39° | 55° | — | — |
| 2020 | 55° | 46° | 51° | 0.55" | — |
| 2019 | 75° | 45° | 60° | — | — |
| 2018 | 72° | 40° | 56° | — | — |
| 2017 | 83° | 61° | 72° | — | — |
| 2016 | 63° | 32° | 47° | — | — |
| 2015 | 68° | 53° | 61° | 1.21" | — |
| 2014 | 77° | 42° | 60° | — | — |
| 2013 | 73° | 50° | 62° | — | — |
| 2012 | 68° | 42° | 55° | — | — |
| 2011 | 78° | 64° | 71° | — | — |
| 2010coldest | 44° | 33° | 39° | 0.39" | — |
| 2009 | 81° | 50° | 65° | — | — |
| 2008 | 75° | 35° | 55° | — | — |
| 2007 | 77° | 64° | 71° | 0.02" | — |
| 2006 | 73° | 37° | 55° | — | — |
| 2005 | 77° | 62° | 70° | 0.02" | — |
| 2004 | 75° | 58° | 66° | 0.02" | — |
| 2003 | 61° | 51° | 56° | — | — |
| 2002 | 63° | 41° | 52° | 0.01" | — |
| 2001 | 67° | 40° | 53° | — | — |
| 2000 | 76° | 59° | 67° | 0.03" | — |
| 1999 | 68° | 42° | 55° | — | — |
| 1998 | 61° | 34° | 47° | — | — |
| 1997 | 78° | 46° | 62° | — | — |
| 1996 | 61° | 30° | 45° | — | — |
| 1995 | 82° | 55° | 69° | — | — |
| 1994 | 85° | 58° | 71° | — | — |
| 1993 | 59° | 52° | 55° | — | — |
| 1992 | 65° | 49° | 57° | — | — |
| 1991 | 70° | 58° | 64° | — | — |
| 1990 | 67° | 44° | 55° | — | — |
| 1989 | 86° | 36° | 61° | 0.22" | — |
| 1988 | 79° | 43° | 61° | — | — |
| 1987 | 81° | 44° | 62° | — | — |
| 1986 | 63° | 35° | 49° | — | — |
| 1985 | 73° | 49° | 61° | 0.05" | — |
| 1984 | 74° | 40° | 57° | — | — |
| 1983 | 51° | 30° | 41° | — | — |
| 1982 | 77° | 52° | 64° | — | — |
| 1981 | 78° | 56° | 67° | — | — |
| 1980 | 75° | 38° | 56° | — | — |
| 1979 | 75° | 58° | 66° | 1.12" | — |
| 1978 | 85° | 60° | 72° | — | — |
| 1977 | 72° | 55° | 63° | — | — |
| 1976 | 81° | 45° | 63° | — | — |
| 1975 | 82° | 62° | 72° | — | — |
| 1974 | 60° | 33° | 47° | 0.63" | — |
| 1973 | 71° | 42° | 57° | — | — |
| 1972 | 81° | 59° | 70° | 1.2" | — |
| 1971 | 83° | 49° | 66° | — | — |
Round Rock, TX Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Round Rock, TX Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Round Rock, TX Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Round Rock, TX
Most pleasant months in Round Rock, TX: February, March, April, October, November.
What to expect on March 21st
This page shows what actually happened each year. For the odds — typical high and low, and how often it stays dry — see the climatological outlook for this date.
March 21st outlook →