Sunnyvale weather by month
What a typical year looks like in Sunnyvale, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. No nearby active station has official 1991–2020 normals, so these are forecast.blue’s own averages computed from daily observations at Mesquite Metro Airport, 6 km from Sunnyvale, over its available record (2022–2026) — not an NCEI normal; records cover 2022–2026.
The year at a glance
- Precipitation a year
- 9.6 in244 mm
- Snow a year
- Rare
- Last spring freeze
- Mar 13
- First fall freeze
- Rare
- Heating degree days
- —
- Cooling degree days
- —
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 19°−7° (heating, 99%) and 106°41° (cooling, 1%).
Month by month
Sunnyvale in January
Highs average 57°14° and lows 34°1°, with 0.9 in23 mm of precipitation in a typical January.
- Record high
- 82°28° (2023)
- Record low
- 11°−12° (2024)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in February
Highs average 66°19° and lows 42°6°, with 0.8 in20 mm of precipitation in a typical February.
- Record high
- 90°32° (2024)
- Record low
- 13°−11° (2025)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in March
Highs average 74°23° and lows 49°10°, with 0.7 in18 mm of precipitation in a typical March.
- Record high
- 91°33° (2025)
- Record low
- 21°−6° (2022)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in April
Highs average 77°25° and lows 57°14°, with 0.6 in15 mm of precipitation in a typical April.
- Record high
- 92°33° (2026)
- Record low
- 36°2° (2025)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in May
Highs average 86°30° and lows 64°18°, with 1.2 in30 mm of precipitation in a typical May.
- Record high
- 98°37° (2024)
- Record low
- 49°9° (2026)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in June
Highs average 94°34° and lows 72°22°, with 0.5 in13 mm of precipitation in a typical June.
- Record high
- 101°38° (2022)
- Record low
- 64°18° (2022)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in July
Highs average 98°37° and lows 74°23°, with 0.4 in10 mm of precipitation in a typical July.
- Record high
- 107°42° (2022)
- Record low
- 66°19° (2024)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in August
Highs average 99°37° and lows 75°24°, with 0.8 in20 mm of precipitation in a typical August.
- Record high
- 112°44° (2023)
- Record low
- 65°18° (2023)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in September
Highs average 93°34° and lows 68°20°, with 0.4 in10 mm of precipitation in a typical September.
- Record high
- 111°44° (2023)
- Record low
- 53°12° (2022)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in OctoberThis month
Highs average 83°29° and lows 57°14°, with 1.8 in46 mm of precipitation in a typical October.
- Record high
- 98°37° (2024)
- Record low
- 33°1° (2022)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in November
Highs average 70°21° and lows 47°8°, with 0.9 in23 mm of precipitation in a typical November.
- Record high
- 87°31° (2025)
- Record low
- 27°−3° (2022)
- Heating degree days
- —
- Cooling degree days
- —
Sunnyvale in December
Highs average 63°17° and lows 41°5°, with 0.6 in15 mm of precipitation in a typical December.
- Record high
- 85°29° (2025)
- Record low
- 11°−12° (2022)
- Heating degree days
- —
- Cooling degree days
- —
Kaufman 3 SE station, 1900–2012: records and averages
This station is no longer reporting, but its 1900–2012 record is the longest and most local history available. These are its own averages over its own period of record — not NCEI normals, and not the same station as the computed averages above.
January
Average high 56°13°, low 34°1°, 2.7 in69 mm precipitation.
Record high 91°33° (1911); record low −3°−19° (1940).
February
Average high 60°16°, low 37°3°, 2.9 in74 mm precipitation.
Record high 96°36° (1996); record low −1°−18° (1949).
March
Average high 68°20°, low 45°7°, 3.2 in81 mm precipitation.
Record high 93°34° (1928); record low 11°−12° (1943).
April
Average high 76°25°, low 53°12°, 4.1 in104 mm precipitation.
Record high 100°38° (1963); record low 28°−2° (1989).
May
Average high 83°28°, low 62°17°, 4.9 in124 mm precipitation.
Record high 104°40° (1928); record low 37°3° (1903).
June
Average high 91°33°, low 70°21°, 3.4 in86 mm precipitation.
Record high 108°42° (1936); record low 47°8° (1903).
July
Average high 96°35°, low 73°23°, 2.5 in64 mm precipitation.
Record high 112°44° (1978); record low 56°13° (1972).
August
Average high 97°36°, low 73°23°, 2.4 in61 mm precipitation.
Record high 113°45° (1936); record low 54°12° (1992).
September
Average high 90°32°, low 66°19°, 3.3 in84 mm precipitation.
Record high 110°43° (2000); record low 38°3° (1942).
October
Average high 80°27°, low 55°13°, 3.8 in97 mm precipitation.
Record high 102°39° (1938); record low 21°−6° (1993).
November
Average high 68°20°, low 44°7°, 3.3 in84 mm precipitation.
Record high 90°32° (1934); record low 14°−10° (1950).
December
Average high 58°14°, low 36°2°, 3.4 in86 mm precipitation.
Record high 88°31° (1924); record low −3°−19° (1989).