Historical weather data, all-time temperature records, and monthly climate averages for McAllen, TX. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 4th in McAllen runs warm — expect a high around 86° and a low near 63°, with only a 14% chance of rain. This date has seen wild swings over the decades, from a scorching 102° in 1955 down to a jarring 41° back in 1944. Snow? Not a factor: zero recorded instances.
McAllen doesn't mess around — it hit 110° in May 2024, one of the highest temperatures ever recorded in the continental U.S. The cold side is rare but real: a 17° reading in January 1962 proves even deep South Texas can freeze. Even Christmas 2004 brought 1.7 inches of snow, the most on record.
McAllen is hot most of the year, with highs climbing from 70° in January to a peak of 97-98° in late July and early August. If you're heat-sensitive, January through February — with highs in the low-to-mid 70s — is your window. September is the wettest stretch, averaging over an inch of rainfall in a single week during mid-month.