Harlingen weather in May: Harlingen, Texas: normal highs, lows, rain and records for May
Harlingen in May has a normal high of 91°F and a normal low of 71°F, a daily mean of 81°F, rising from 89°F on the 1st to 94°F by the 31st. Measurable precipitation falls on 6 days in a normal May, 2.50 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 33°C and low of 22°C, 64 mm of precipitation in May.
- NOAA stationHarlingen Rio Grande Airport
- Station IDUSW00012904
- Location26.23°N 97.65°W
- Elevation34 ft (10 m)
- Population72,234
- Jan 72° 50°
- Feb 76° 54°
- Mar 81° 59°
- Apr 87° 65°
- May 91° 71°
- Jun 95° 75°
- Jul 96° 75°
- Aug 97° 75°
- Sep 92° 73°
- Oct 88° 66°
- Nov 79° 57°
- Dec 73° 52°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Harlingen in May?
The normal high is 91°F and the normal low 71°F, for a daily mean of 81.2°F. May is 5.4°F warmer than April and 3.6°F cooler than June. May is the 5th warmest month of the year in Harlingen and the 3rd wettest. Across the month the normal high rises 5°F, from 89°F on May 1 to 94°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 79°F and 83°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 20%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| May 1 | 89°F | 68°F | 16% | 6% |
| May 8 | 90°F | 70°F | 17% | 7% |
| May 15 | 91°F | 71°F | 18% | 8% |
| May 22 | 93°F | 72°F | 19% | 9% |
| May 31 | 94°F | 74°F | 20% | 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 | 89°F | 68°F | 16% | 6% | 13 h 10 min |
| May 2 | 89°F | 68°F | 16% | 7% | 13 h 10 min |
| May 3 | 89°F | 69°F | 16% | 7% | 13 h 10 min |
| May 4 | 89°F | 69°F | 16% | 7% | 13 h 10 min |
| May 5 | 89°F | 69°F | 16% | 7% | 13 h 10 min |
| May 6 | 90°F | 69°F | 16% | 7% | 13 h 10 min |
| May 7 | 90°F | 69°F | 17% | 7% | 13 h 20 min |
| May 8 | 90°F | 70°F | 17% | 7% | 13 h 20 min |
| May 9 | 90°F | 70°F | 17% | 8% | 13 h 20 min |
| May 10 | 90°F | 70°F | 17% | 8% | 13 h 20 min |
| May 11 | 91°F | 70°F | 18% | 8% | 13 h 20 min |
| May 12 | 91°F | 70°F | 18% | 8% | 13 h 20 min |
| May 13 | 91°F | 71°F | 18% | 8% | 13 h 20 min |
| May 14 | 91°F | 71°F | 18% | 8% | 13 h 20 min |
| May 15 | 91°F | 71°F | 18% | 8% | 13 h 20 min |
| May 16 | 91°F | 71°F | 18% | 9% | 13 h 30 min |
| May 17 | 92°F | 71°F | 19% | 9% | 13 h 30 min |
| May 18 | 92°F | 72°F | 19% | 9% | 13 h 30 min |
| May 19 | 92°F | 72°F | 19% | 9% | 13 h 30 min |
| May 20 | 92°F | 72°F | 19% | 9% | 13 h 30 min |
| May 21 | 92°F | 72°F | 19% | 9% | 13 h 30 min |
| May 22 | 93°F | 72°F | 19% | 9% | 13 h 30 min |
| May 23 | 93°F | 72°F | 19% | 9% | 13 h 30 min |
| May 24 | 93°F | 73°F | 19% | 9% | 13 h 30 min |
| May 25 | 93°F | 73°F | 19% | 9% | 13 h 30 min |
| May 26 | 93°F | 73°F | 19% | 9% | 13 h 40 min |
| May 27 | 93°F | 73°F | 19% | 9% | 13 h 40 min |
| May 28 | 94°F | 73°F | 20% | 9% | 13 h 40 min |
| May 29 | 94°F | 73°F | 20% | 9% | 13 h 40 min |
| May 30 | 94°F | 73°F | 20% | 9% | 13 h 40 min |
| May 31 | 94°F | 74°F | 20% | 10% | 13 h 40 min |
- Normal high
- 91°FMay average
- Normal low
- 71°FMay average
- Precipitation
- 2.50 inmonth total
- Days with precipitation
- 60.01 inch or more
- Days at 90°F or more
- 22
- 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 USW00012904; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Harlingen in May?
On a given May day the chance of 0.01 inch or more is 18% on average, highest around May 31 (20%). In all, 2.50 in falls on 6 days of a normal May, 1 of them with an inch or more.
In a normal May in Harlingen, 22 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012904.
What are the records for May in Harlingen?
The warmest May temperature on this station's record (since 1952) is 107°F, on May 9, 2024; the coldest is 50°F, on May 3, 2004. The wettest May brought 11.06 in (2007).
The May mean against the 1991-2020 normal of 81.2°F: 2021 79.6°F (−1.6), 2022 83.5°F (+2.3), 2023 80.2°F (−1.0), 2024 85.6°F (+4.4), 2025 82.5°F (+1.3), 2026 79.5°F (−1.7). 3 of 6 ran warmer than normal.
| May | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 79.6°F | −1.6°F | 7.77 in |
| 2022 | 83.5°F | +2.3°F | 4.91 in |
| 2023 | 80.2°F | −1.0°F | 6.42 in |
| 2024 | 85.6°F | +4.4°F | 1.35 in |
| 2025 | 82.5°F | +1.3°F | 3.52 in |
| 2026 | 79.5°F | −1.7°F | 4.71 in |
Source: records: ACIS, station USW00012904; recent months: ACIS, station USW00012904. Records and recent months use complete months only.
How does May in Harlingen 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; Harlingen's is 91°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.