Harlingen, United States weather by month
Measured at Harlingen/Valley Intl
Averages and records for each calendar month at Harlingen/Valley Intl, United States, from 1952 to 2026. The warmest month is August, averaging 35.8°C; the coolest is January at 22.0°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 22.0°C | 10.1°C | 34.4°C24 January 2002 | −8.3°C12 January 1962 | 40 / 40 |
| February | 24.0°C | 12.2°C | 35.6°C9 February 1962 | −5.5°C15 February 2021 | 40 / 40 |
| March | 27.0°C | 15.3°C | 38.3°C12 March 1954 | 1.1°C5 March 2007 | 40 / 40 |
| April | 29.9°C | 18.8°C | 41.1°C6 April 2022 | 5.0°C8 April 2007 | 40 / 40 |
| May | 32.5°C | 21.9°C | 41.7°C9 May 2024 | 10.0°C3 May 2004 | 40 / 40 |
| June | 34.5°C | 23.8°C | 41.1°C26 June 2012 | 15.6°C2 June 1997 | 39 / 39 |
| July | 35.2°C | 24.2°C | 41.1°C24 July 2018 | 20.0°C25 July 2019 | 38 / 40 |
| August | 35.8°C | 24.2°C | 41.1°C28 August 2011 | 20.0°C15 August 1999 | 40 / 40 |
| September | 33.1°C | 22.8°C | 41.7°C5 September 2000 | 11.7°C27 September 2000 | 38 / 40 |
| October | 30.4°C | 18.8°C | 38.3°C18 October 2012 | 3.9°C29 October 2017 | 39 / 39 |
| November | 25.9°C | 14.3°C | 34.4°C1 November 1997 | −0.5°C14 November 2018 | 39 / 39 |
| December | 22.8°C | 11.2°C | 32.2°C14 December 2019 | −2.7°C23 December 2022 | 39 / 39 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 38 to 40 years each.
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Climate at nearby stations
The closest stations with twelve months of archive of their own, nearest first.
Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.