McAllen, TX weather in May
McAllen is hot, oppressively humid and mostly dry in May: highs average 93°F and nights drop to about 74°F. There are about 4 days with rain. Midday heat is the main thing to plan around.
- Normal high
- 93°F
- Normal low
- 74°F
- Wet days
- 4
- 2.0 in total
- Muggy days
- 27
- dew point 65°F+
How May changes from start to finish
| May 1 | May 31 | |
|---|---|---|
| Normal high | 90°F | 96°F |
| Normal low | 71°F | 77°F |
| Chance of a wet day | 13% | 15% |
| Sunrise / sunset | 6:55 am / 8:04 pm | 6:40 am / 8:20 pm |
| Daylight | 13.2 h | 13.7 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Central Time).
A typical May day
- 6 am74°Fdew point 70°F
- 9 am81°Fdew point 71°F
- Noon88°Fdew point 69°F
- 3 pm91°Fdew point 68°F
- 6 pm86°Fdew point 68°F
- 9 pm79°Fdew point 70°F
NOAA hourly normals (local standard time) from Mcallen Miller Intl Airport (2 mi away); average wind 12 mph; clear or few clouds in 61% of daytime hours, mostly cloudy or overcast in 25%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more24 of 31
- Muggy daysdaily mean dew point 65°F or more27 of 31
- Wet daysat least 0.01 in of rain or melted snow4 of 31
- Notable rainat least 0.10 in3 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per May, counted from daily records for each year 1991-2020.
Rain in May
Normal precipitation is 2.0 in; a dry May brings about 0.7 in and a wet one about 2.8 in (25th and 75th percentiles). About 1 day brings half an inch or more, and about 1 an inch or more.
How May varies from year to year
- Warmest May, 1991-20202018: average high 96°F
- Coolest May1992: average high 86°F
- Wettest May2016: 7.0 in
- Driest May1998: no measurable precipitation
- Highest reading110°F (May 4, 1999)
- Lowest reading51°F (May 3, 2004)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
May compared with April and June
| April | May | June | |
|---|---|---|---|
| Normal high | 88°F | 93°F | 97°F |
| Normal low | 68°F | 74°F | 78°F |
| Wet days | 4 | 4 | 5 |
| Comfortable days | 2 | 0 | 0 |
| Daylight | 12.8 h | 13.4 h | 13.8 h |
Highs change by +5°F from April and +4°F into June.
Nearby alternatives in May
- Cooler: South Padre Island, TX66 mi · high 84°F · 5 wet days
How McAllen ranks in May
- Normal high10th warmest of 378 cities; 3rd of 38 in Texas
- Wet days75th driest of 378
- Comfortable days333rd most of 339
What to pack for McAllen in May
- Light, breathable clothing – highs near 93°F and about 27 muggy days
Heating and cooling
May has 0 heating degree days and 577 cooling degree days (base 65°F), 11% of the year's total heating and cooling demand.
Questions
How hot is McAllen in May?
The normal high is 93°F and the normal low is 74°F. From 1991 to 2020 the hottest May reading was 110°F (May 4, 1999).
Does it rain a lot in McAllen in May?
About 4 days in May have at least 0.01 in of precipitation, and the normal total is 2.0 in. The wettest May in 1991-2020 was in 2016 (7.0 in); the driest was in 1998, with no measurable precipitation.
Is May a good time to visit McAllen?
May ranks 8th of 12 months on our comfort score for McAllen (39 out of 100). It has almost no comfortable days and about 24 days at 90°F or hotter. The best months are January and December.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: Mcallen Miller Intl Airport (USW00012959), 2.0 mi SW of the city center, 100 ft . NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Mcallen (USC00415701), 1.5 mi WSW of the city center, 100 ft . NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Mc Allen Miller Intl Arpt (722506-12959), 1.9 mi SSW of the city center, 99 ft . Hourly observations, 1991-2020.