May weather in Port Isabel, TX
The average temperature in Port Isabel in May is 79.4°F (72.7°F–86.1°F). Average precipitation: 2.36 inches.
May is a spring month in Port Isabel, and is warmer than the annual average of 73.9°F. Daily temperatures swing about 13.4°F between overnight low and afternoon high. Expect about 4 days with precipitation. Daylight averages about 13h 17m. For travel, May is a comfortable month to visit.
Avg High
86.1°F
Avg Low
72.7°F
Precipitation
2.36 in
Daylight
13h 17m
May records in Port Isabel
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| May 1 | 93.9°F (1953) | 57.9°F (2004) | 1.21 in (1994) |
| May 2 | 97.0°F (1954) | 54.0°F (2004) | 1.95 in (2000) |
| May 3 | 96.1°F (1957) | 53.1°F (2014) | 0.22 in (1986) |
| May 4 | 114.1°F (1984) | 52.0°F (2013) | 3.24 in (1992) |
| May 5 | 96.1°F (1999) | 57.0°F (1935) | 1.92 in (1941) |
| May 6 | 91.9°F (2012) | 55.9°F (1944) | 1.69 in (1990) |
| May 7 | 93.0°F (2009) | 59.0°F (1935) | 1.60 in (1963) |
| May 8 | 93.0°F (1978) | 59.0°F (1960) | 0.95 in (2004) |
| May 9 | 91.9°F (2006) | 57.0°F (1960) | 2.15 in (2023) |
| May 10 | 98.1°F (2006) | 46.9°F (2020) | 1.40 in (1993) |
| May 11 | 91.9°F (2009) | 60.1°F (1981) | 2.69 in (1931) |
| May 12 | 93.0°F (2009) | 61.0°F (1979) | 1.67 in (2012) |
| May 13 | 91.0°F (2011) | 59.0°F (1979) | 1.92 in (2023) |
| May 14 | 91.9°F (2006) | 59.0°F (1953) | 1.50 in (1939) |
| May 15 | 91.0°F (1945) | 60.1°F (1953) | 1.26 in (1994) |
| May 16 | 91.0°F (2003) | 62.1°F (2006) | 1.40 in (1984) |
| May 17 | 93.9°F (2003) | 55.0°F (2020) | 1.40 in (2020) |
| May 18 | 93.9°F (2003) | 60.1°F (2020) | 3.45 in (1982) |
| May 19 | 93.0°F (2013) | 64.9°F (1952) | 4.22 in (1965) |
| May 20 | 93.9°F (2008) | 64.9°F (1932) | 1.54 in (1960) |
| May 21 | 96.1°F (2011) | 63.0°F (1986) | 1.20 in (1976) |
| May 22 | 93.9°F (1984) | 60.1°F (1942) | 4.01 in (1945) |
| May 23 | 91.9°F (1955) | 64.0°F (1967) | 0.72 in (1964) |
| May 24 | 93.0°F (2009) | 66.9°F (1967) | 4.23 in (1930) |
| May 25 | 93.9°F (2024) | 64.9°F (2022) | 2.06 in (1947) |
| May 26 | 93.0°F (2011) | 61.0°F (1940) | 1.33 in (1933) |
| May 27 | 93.0°F (2011) | 64.9°F (2022) | 1.00 in (2009) |
| May 28 | 91.9°F (2011) | 64.9°F (2022) | 3.84 in (1944) |
| May 29 | 93.9°F (2005) | 66.0°F (1934) | 5.04 in (1929) |
| May 30 | 95.0°F (2003) | 66.9°F (1942) | 2.94 in (1986) |
| May 31 | 93.9°F (2012) | 66.0°F (1934) | 1.28 in (1930) |