Harlingen weather by month
What a typical year looks like in Harlingen, Texas: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Harlingen Rio Grande Valley International Airport, 6 km from Harlingen; records cover 1952–2026.
The year at a glance
- Precipitation a year
- 24 in611 mm
- Snow a year
- Rare
- Last spring freeze
- Jan 17
- First fall freeze
- Dec 19
- Heating degree days
- 571
- Cooling degree days
- 4,218
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are 35°2° (heating, 99%) and 101°38° (cooling, 1%).
Month by month
Harlingen in January
Highs average 72°22° and lows 50°10°, with 1.1 in27 mm of precipitation in a typical January.
- Record high
- 94°34° (2002)
- Record low
- 17°−8° (1962)
- Heating degree days
- 190
- Cooling degree days
- 58
Harlingen in February
Highs average 76°24° and lows 54°12°, with 0.73 in19 mm of precipitation in a typical February.
- Record high
- 96°36° (1962)
- Record low
- 22°−6° (2021)
- Heating degree days
- 105
- Cooling degree days
- 102
Harlingen in March
Highs average 81°27° and lows 59°15°, with 1.3 in33 mm of precipitation in a typical March.
- Record high
- 101°38° (1954)
- Record low
- 34°1° (2007)
- Heating degree days
- 40
- Cooling degree days
- 201
Harlingen in April
Highs average 87°30° and lows 65°18°, with 1.5 in37 mm of precipitation in a typical April.
- Record high
- 106°41° (2022)
- Record low
- 41°5° (2007)
- Heating degree days
- 7
- Cooling degree days
- 332
Harlingen in May
Highs average 91°33° and lows 71°22°, with 2.5 in64 mm of precipitation in a typical May.
- Record high
- 107°42° (2024)
- Record low
- 50°10° (2004)
- Heating degree days
- 0
- Cooling degree days
- 502
Harlingen in June
Highs average 95°35° and lows 75°24°, with 2.3 in57 mm of precipitation in a typical June.
- Record high
- 106°41° (2012)
- Record low
- 60°16° (1997)
- Heating degree days
- 0
- Cooling degree days
- 594
Harlingen in July
Highs average 96°36° and lows 75°24°, with 1.8 in45 mm of precipitation in a typical July.
- Record high
- 106°41° (2018)
- Record low
- 68°20° (2019)
- Heating degree days
- 0
- Cooling degree days
- 643
Harlingen in August
Highs average 97°36° and lows 75°24°, with 1.9 in49 mm of precipitation in a typical August.
- Record high
- 106°41° (2011)
- Record low
- 68°20° (1999)
- Heating degree days
- 0
- Cooling degree days
- 658
Harlingen in September
Highs average 92°33° and lows 73°23°, with 5.3 in135 mm of precipitation in a typical September.
- Record high
- 107°42° (2000)
- Record low
- 53°12° (2000)
- Heating degree days
- 0
- Cooling degree days
- 520
Harlingen in OctoberThis month
Highs average 88°31° and lows 66°19°, with 2.7 in69 mm of precipitation in a typical October.
- Record high
- 101°38° (2012)
- Record low
- 39°4° (2017)
- Heating degree days
- 5
- Cooling degree days
- 364
Harlingen in November
Highs average 79°26° and lows 57°14°, with 1.8 in46 mm of precipitation in a typical November.
- Record high
- 94°34° (1997)
- Record low
- 31°−1° (2018)
- Heating degree days
- 62
- Cooling degree days
- 162
Harlingen in December
Highs average 73°23° and lows 52°11°, with 1.2 in31 mm of precipitation in a typical December.
- Record high
- 90°32° (2019)
- Record low
- 27°−3° (2022)
- Heating degree days
- 162
- Cooling degree days
- 82