McAllen weather in May: McAllen, Texas: normal highs, lows, rain and records for May
McAllen in May has a normal high of 93°F and a normal low of 74°F, a daily mean of 84°F, rising from 90°F on the 1st to 96°F by the 31st. Measurable precipitation falls on 4 days in a normal May, 2.03 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 34°C and low of 23°C, 52 mm of precipitation in May.
- NOAA stationMcAllen Miller International Airport
- Station IDUSW00012959
- Location26.18°N 98.25°W
- Elevation100 ft (31 m)
- From the center3 miles
- Population148,782
- Jan 73° 53°
- Feb 77° 57°
- Mar 83° 63°
- Apr 88° 68°
- May 93° 74°
- Jun 97° 78°
- Jul 99° 79°
- Aug 100° 79°
- Sep 94° 76°
- Oct 89° 69°
- Nov 80° 60°
- Dec 74° 54°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is McAllen in May?
The normal high is 93°F and the normal low 74°F, for a daily mean of 83.6°F. May is 5.2°F warmer than April and 4.1°F cooler than June. May is the 5th warmest month of the year in McAllen and the 4th wettest. Across the month the normal high rises 6°F, from 90°F on May 1 to 96°F on May 31. From one year to the next May's mean temperature typically moves about 2.0°F either way (NOAA's standard deviation), so roughly two Mays in three average between 82°F and 86°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 16%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 90°F | 71°F | 13% | 7% |
| May 8 | 91°F | 73°F | 13% | 8% |
| May 15 | 93°F | 74°F | 14% | 9% |
| May 22 | 94°F | 75°F | 15% | 9% |
| May 31 | 96°F | 77°F | 16% | 10% |
Every day of May: normal high, low and chance of precipitation (warmest afternoon May 31, coldest night May 1)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| May 1 | 90°F | 71°F | 13% | 7% | 13 h 10 min |
| May 2 | 90°F | 71°F | 13% | 7% | 13 h 10 min |
| May 3 | 91°F | 72°F | 13% | 7% | 13 h 10 min |
| May 4 | 91°F | 72°F | 13% | 7% | 13 h 10 min |
| May 5 | 91°F | 72°F | 13% | 7% | 13 h 10 min |
| May 6 | 91°F | 72°F | 13% | 7% | 13 h 10 min |
| May 7 | 91°F | 72°F | 13% | 7% | 13 h 20 min |
| May 8 | 91°F | 73°F | 13% | 8% | 13 h 20 min |
| May 9 | 92°F | 73°F | 13% | 8% | 13 h 20 min |
| May 10 | 92°F | 73°F | 13% | 8% | 13 h 20 min |
| May 11 | 92°F | 73°F | 14% | 8% | 13 h 20 min |
| May 12 | 92°F | 73°F | 14% | 8% | 13 h 20 min |
| May 13 | 92°F | 74°F | 14% | 8% | 13 h 20 min |
| May 14 | 93°F | 74°F | 14% | 8% | 13 h 20 min |
| May 15 | 93°F | 74°F | 14% | 9% | 13 h 20 min |
| May 16 | 93°F | 74°F | 14% | 9% | 13 h 30 min |
| May 17 | 93°F | 74°F | 14% | 9% | 13 h 30 min |
| May 18 | 94°F | 75°F | 14% | 9% | 13 h 30 min |
| May 19 | 94°F | 75°F | 14% | 9% | 13 h 30 min |
| May 20 | 94°F | 75°F | 14% | 9% | 13 h 30 min |
| May 21 | 94°F | 75°F | 15% | 9% | 13 h 30 min |
| May 22 | 94°F | 75°F | 15% | 9% | 13 h 30 min |
| May 23 | 95°F | 75°F | 15% | 9% | 13 h 30 min |
| May 24 | 95°F | 76°F | 15% | 10% | 13 h 30 min |
| May 25 | 95°F | 76°F | 15% | 10% | 13 h 30 min |
| May 26 | 95°F | 76°F | 15% | 10% | 13 h 40 min |
| May 27 | 96°F | 76°F | 15% | 10% | 13 h 40 min |
| May 28 | 96°F | 76°F | 15% | 10% | 13 h 40 min |
| May 29 | 96°F | 76°F | 15% | 10% | 13 h 40 min |
| May 30 | 96°F | 77°F | 15% | 10% | 13 h 40 min |
| May 31 | 96°F | 77°F | 16% | 10% | 13 h 40 min |
- Normal high
- 93°FMay average
- Normal low
- 74°FMay average
- Precipitation
- 2.03 inmonth total
- Days with precipitation
- 40.01 inch or more
- Days at 90°F or more
- 24
- Daylight
- 13 h 10 min to 13 h 40 minMay 1 to May 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 30
- Sunshine
- 82%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00012959; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in McAllen in May?
On a given May day the chance of 0.01 inch or more is 14% on average, highest around May 31 (16%). In all, 2.03 in falls on 4 days of a normal May, 1 of them with an inch or more.
In a normal May in McAllen, 24 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012959.
How humid and windy is McAllen in May?
At 3 p.m. the normal temperature is 93°F with 46% relative humidity and a dew point of 70°F; at 6 a.m. it is 76°F with 89% humidity. The wind averages 11.7 mph, most often from the southeast in the afternoon. A dew point of 65°F or more feels muggy to most people.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 76°F | 73°F | 89% | 7.9 mph | 64% |
| 9 a.m. | 84°F | 73°F | 70% | 12.8 mph | 49% |
| noon | 91°F | 70°F | 51% | 12.7 mph | 65% |
| 3 p.m. | 93°F | 70°F | 46% | 14.1 mph | 72% |
| 6 p.m. | 89°F | 70°F | 53% | 15.9 mph | 84% |
| 9 p.m. | 81°F | 72°F | 73% | 12.2 mph | 85% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00012959. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for May in McAllen?
The warmest May temperature on McAllen's official record (since 1941) is 111°F, on May 9, 2024; the coldest is 50°F, on May 6, 1944. The wettest May brought 7.91 in (1966).
The May mean against the 1991-2020 normal of 83.6°F: 2021 80.4°F (−3.2), 2022 84.2°F (+0.6), 2023 81.2°F (−2.4), 2024 88.1°F (+4.5), 2025 85.2°F (+1.6), 2026 82.2°F (−1.4). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 80.4°F | −3.2°F | 7.59 in |
| 2022 | 84.2°F | +0.6°F | 3.33 in |
| 2023 | 81.2°F | −2.4°F | 5.28 in |
| 2024 | 88.1°F | +4.5°F | 2.45 in |
| 2025 | 85.2°F | +1.6°F | 1.14 in |
| 2026 | 82.2°F | −1.4°F | 3.10 in |
Source: records: ACIS, NWS threaded record MFEthr; recent months: ACIS, station USW00012959. Records and recent months use complete months only.
How does May in McAllen compare across Texas?
Across the 321 places PlainClimate covers in Texas, May normal highs run from 78°F in Hartley to 98°F in Terlingua; McAllen's is 93°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.