May weather in McAllen, TX
The average temperature in McAllen in May is 81.5°F (71.4°F–91.6°F). Average precipitation: 1.39 inches.
May is a spring month in McAllen, and is warmer than the annual average of 75.5°F. Daily temperatures swing about 20.2°F between overnight low and afternoon high. Expect about 3 days with precipitation. Daylight averages about 13h 17m. For travel, May is hot.
Avg High
91.6°F
Avg Low
71.4°F
Precipitation
1.39 in
Daylight
13h 17m
May records in McAllen
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 104.0°F (1948) | 53.1°F (1996) | 1.72 in (1966) |
| May 2 | 106.0°F (1948) | 54.0°F (1976) | 1.40 in (1986) |
| May 3 | 104.0°F (1984) | 39.9°F (2004) | 4.26 in (1992) |
| May 4 | 116.1°F (1987) | 50.0°F (1954) | 4.48 in (1981) |
| May 5 | 109.0°F (1999) | 51.1°F (1970) | 2.36 in (1963) |
| May 6 | 102.9°F (1999) | 50.0°F (1944) | 1.46 in (1987) |
| May 7 | 102.9°F (1999) | 54.0°F (1944) | 0.34 in (1942) |
| May 8 | 104.0°F (1946) | 55.9°F (1944) | 3.08 in (1990) |
| May 9 | 98.1°F (1967) | 57.9°F (1984) | 0.70 in (2004) |
| May 10 | 109.9°F (2024) | 54.0°F (1961) | 0.61 in (1993) |
| May 11 | 104.0°F (2006) | 54.0°F (1961) | 1.50 in (1951) |
| May 12 | 106.0°F (1974) | 50.0°F (1952) | 2.00 in (2015) |
| May 13 | 102.0°F (1945) | 57.0°F (1952) | 2.00 in (2023) |
| May 14 | 100.0°F (1995) | 55.9°F (1976) | 2.11 in (1991) |
| May 15 | 100.0°F (1945) | 55.0°F (1976) | 1.49 in (1967) |
| May 16 | 98.1°F (2025) | 51.1°F (1945) | 2.05 in (2016) |
| May 17 | 102.0°F (1946) | 55.0°F (1970) | 1.53 in (1965) |
| May 18 | 98.1°F (1960) | 54.0°F (1970) | 2.44 in (1965) |
| May 19 | 102.9°F (1946) | 44.1°F (2012) | 3.35 in (1980) |
| May 20 | 100.0°F (2003) | 60.1°F (1952) | 2.46 in (2021) |
| May 21 | 100.0°F (1957) | 61.0°F (2021) | 1.09 in (1982) |
| May 22 | 100.9°F (1944) | 60.1°F (1942) | 1.66 in (1945) |
| May 23 | 102.9°F (1955) | 60.1°F (1967) | 0.65 in (1977) |
| May 24 | 102.0°F (2008) | 59.0°F (1967) | 3.10 in (2022) |
| May 25 | 100.0°F (2024) | 59.0°F (1967) | 0.97 in (1947) |
| May 26 | 100.0°F (1955) | 54.0°F (2012) | 1.22 in (1948) |
| May 27 | 100.9°F (2024) | 55.9°F (2012) | 1.84 in (1986) |
| May 28 | 104.0°F (1973) | 60.1°F (1951) | 2.10 in (1975) |
| May 29 | 100.9°F (2024) | 66.0°F (1961) | 1.50 in (1975) |
| May 30 | 100.0°F (2005) | 63.0°F (1992) | 2.10 in (1943) |
| May 31 | 104.0°F (2004) | 59.0°F (1984) | 1.20 in (1987) |