McAllen weather by month
Measured at Weslaco/Mid Valley Arpt
Averages and records for each calendar month at Weslaco/Mid Valley Arpt, United States, from 1914 to 2026. The warmest month is August, averaging 35.7°C; the coolest is January at 21.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 21.8°C | 9.7°C | 33.9°C31 January 1971 | −8.9°C12 January 1962 | 89 / 107 |
| February | 24.1°C | 11.6°C | 37.8°C29 February 1940 | −6.7°C16 February 2021 | 90 / 107 |
| March | 27.0°C | 14.8°C | 40.0°C27 March 1984 | −3.3°C3 March 1917 | 93 / 107 |
| April | 30.1°C | 18.4°C | 43.3°C17 April 1920 | 0.6°C2 April 1915 | 89 / 109 |
| May | 32.3°C | 21.3°C | 42.2°C10 May 2024 | 8.3°C1 May 1925 | 92 / 106 |
| June | 34.2°C | 23.2°C | 41.7°C22 June 2023 | 11.7°C6 June 1930 | 94 / 108 |
| July | 35.3°C | 23.6°C | 42.2°C10 July 1939 | 16.7°C30 July 1927 | 91 / 108 |
| August | 35.7°C | 23.6°C | 41.1°C24 August 1929 | 16.7°C29 August 1958 | 95 / 109 |
| September | 33.6°C | 22.1°C | 41.7°C6 September 2000 | 8.9°C28 September 1942 | 92 / 107 |
| October | 30.7°C | 18.3°C | 40.0°C19 October 2012 | 0.6°C31 October 1993 | 95 / 106 |
| November | 26.1°C | 14.1°C | 37.2°C5 November 1988 | −1.1°C25 November 1938 | 89 / 104 |
| December | 22.8°C | 10.8°C | 34.4°C11 December 1939 | −8.9°C23 December 1989 | 92 / 104 |
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 89 to 95 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.