Harlingen, TX Climate

Summary Graph

The summary climate graph for Harlingen, TX shows a selection of temperature, rainfall and snow minimum, mean and maximum measures over the course of a year. Click on each of the measures in the key to toggle them on and off.

Graph of average and extreme temperature ranges by day for Harlingen, TX.


The warmest month in Valley International, Harlingen, Texas is August with an average high temperature of 94.8°F. The hottest day on record was September 4 2011 when the temperature hit 107.1°F. During January the overnight temperature drops to an average of 51.8°F with the lowest temperature of 10.0°F being recorded on February 10 1973.

Warmest Days

Warmest Months

Coldest Days

Coldest Months

The warmest days on record are:

4 Sep 2011107.1°F
28 Aug 2011106°F
26 Jun 2012106°F
11 May 1974105.1°F
10 Aug 1988105.1°F

The warmest months on average were:

August 2011100.5°F
August 201299.1°F
August 200998.7°F
July 200998.7°F
July 201298.7°F

The coldest days on record are:

10 Feb 197310°F
12 Jan 196217.1°F
23 Dec 198917.2°F
25 Dec 198321.2°F
19 Dec 199624.8°F

The coldest months on average were:

December 198943.2°F
January 196245.1°F
January 196145.9°F
January 197346.2°F
January 198546.6°F


The wettest month by average rainfall in Harlingen, TX is September with an average of 1.3 inches of rain falling on 6 to 7 days.Although in January it typically rains on more days with 0.2 inches falling in 7 to 8 days. The driest month by average rainfall in Harlingen, TX is January with an average of 0.2 inches of rain falling on 7 to 8 days. Although in May it typically rains on less days with 0.7 inches falling in 3 to 4 days

Wettest Days

The wettest days on record are:

28 March 19992.1 inches
30 March 20061.7 inches
19 March 19971.7 inches
13 March 20071.6 inches
11 March 19860.8 inches

Wettest Months

The wettest months on record are:

May 200711.1 inches
September 199811 inches
July 200810.6 inches
October 199710.3 inches
August 20089.5 inches

Driest Months

The driest months on record are:

April 19420 inches
May 19420 inches
June 19420 inches
July 19420 inches
August 19420 inches