Sienna weather by month
What a typical year looks like in Sienna, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Houston Sugarland Mem, 21 km from Sienna; records cover 2000–2026.
The year at a glance
- Precipitation a year
- 49.7 in1263 mm
- Snow a year
- Rare
- Last spring freeze
- Feb 17
- First fall freeze
- Dec 1
- Heating degree days
- 1,146
- Cooling degree days
- 3,384
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 29°−2° (heating, 99%) and 100°38° (cooling, 1%).
Month by month
Sienna in January
Highs average 64°18° and lows 45°7°, with 3.6 in92 mm of precipitation in a typical January.
- Record high
- 86°30° (2022)
- Record low
- 16°−9° (2010)
- Heating degree days
- 338
- Cooling degree days
- 22
Sienna in February
Highs average 68°20° and lows 50°10°, with 2.8 in72 mm of precipitation in a typical February.
- Record high
- 86°30° (2017)
- Record low
- 14°−10° (2021)
- Heating degree days
- 213
- Cooling degree days
- 40
Sienna in March
Highs average 74°23° and lows 55°13°, with 3.5 in89 mm of precipitation in a typical March.
- Record high
- 91°33° (2013)
- Record low
- 24°−4° (2002)
- Heating degree days
- 108
- Cooling degree days
- 99
Sienna in April
Highs average 80°27° and lows 60°16°, with 4.3 in108 mm of precipitation in a typical April.
- Record high
- 94°34° (2002)
- Record low
- 35°2° (2009)
- Heating degree days
- 27
- Cooling degree days
- 185
Sienna in May
Highs average 87°31° and lows 69°20°, with 5.2 in133 mm of precipitation in a typical May.
- Record high
- 98°37° (2018)
- Record low
- 42°6° (2013)
- Heating degree days
- 1
- Cooling degree days
- 399
Sienna in June
Highs average 92°34° and lows 74°23°, with 4.2 in107 mm of precipitation in a typical June.
- Record high
- 106°41° (2013)
- Record low
- 63°17° (2006)
- Heating degree days
- 0
- Cooling degree days
- 546
Sienna in July
Highs average 95°35° and lows 76°24°, with 4.2 in106 mm of precipitation in a typical July.
- Record high
- 105°41° (2022)
- Record low
- 66°19° (2019)
- Heating degree days
- 0
- Cooling degree days
- 631
Sienna in August
Highs average 94°35° and lows 76°24°, with 5.3 in134 mm of precipitation in a typical August.
- Record high
- 109°43° (2023)
- Record low
- 63°17° (2004)
- Heating degree days
- 0
- Cooling degree days
- 618
Sienna in September
Highs average 90°32° and lows 72°22°, with 4.4 in112 mm of precipitation in a typical September.
- Record high
- 105°41° (2023)
- Record low
- 47°8° (2000)
- Heating degree days
- 0
- Cooling degree days
- 468
Sienna in OctoberThis month
Highs average 83°29° and lows 62°17°, with 4.7 in118 mm of precipitation in a typical October.
- Record high
- 100°38° (2024)
- Record low
- 35°2° (2017)
- Heating degree days
- 20
- Cooling degree days
- 257
Sienna in November
Highs average 74°23° and lows 53°12°, with 3.8 in96 mm of precipitation in a typical November.
- Record high
- 91°33° (2010)
- Record low
- 29°−2° (2010)
- Heating degree days
- 139
- Cooling degree days
- 84
Sienna in December
Highs average 67°19° and lows 46°8°, with 3.8 in96 mm of precipitation in a typical December.
- Record high
- 86°30° (2021)
- Record low
- 17°−8° (2022)
- Heating degree days
- 300
- Cooling degree days
- 35