McAllen weather in August: McAllen, Texas: normal highs, lows, rain and records for August
McAllen in August has a normal high of 100°F and a normal low of 79°F, a daily mean of 89°F, falling from 100°F on the 1st to 97°F by the 31st. Measurable precipitation falls on 5 days in a normal August, 1.81 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 38°C and low of 26°C, 46 mm of precipitation in August.
- 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 August?
The normal high is 100°F and the normal low 79°F, for a daily mean of 89.3°F. August is 0.7°F warmer than July and 4.3°F warmer than September. August is the warmest month of the year in McAllen and the 6th wettest. Across the month the normal high falls 3°F, from 100°F on August 1 to 97°F on August 31. From one year to the next August's mean temperature typically moves about 1.3°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 88°F and 91°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 24%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 100°F | 79°F | 12% | 7% |
| August 8 | 101°F | 79°F | 13% | 7% |
| August 15 | 100°F | 79°F | 15% | 9% |
| August 22 | 99°F | 79°F | 19% | 12% |
| August 31 | 97°F | 78°F | 24% | 16% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 7, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 100°F | 79°F | 12% | 7% | 13 h 20 min |
| August 2 | 100°F | 79°F | 12% | 7% | 13 h 20 min |
| August 3 | 100°F | 79°F | 12% | 7% | 13 h 20 min |
| August 4 | 101°F | 79°F | 12% | 7% | 13 h 20 min |
| August 5 | 101°F | 79°F | 12% | 7% | 13 h 20 min |
| August 6 | 101°F | 79°F | 12% | 7% | 13 h 20 min |
| August 7 | 101°F | 79°F | 13% | 7% | 13 h 20 min |
| August 8 | 101°F | 79°F | 13% | 7% | 13 h 10 min |
| August 9 | 101°F | 79°F | 13% | 7% | 13 h 10 min |
| August 10 | 101°F | 79°F | 13% | 8% | 13 h 10 min |
| August 11 | 101°F | 79°F | 14% | 8% | 13 h 10 min |
| August 12 | 101°F | 79°F | 14% | 8% | 13 h 10 min |
| August 13 | 100°F | 79°F | 15% | 8% | 13 h 10 min |
| August 14 | 100°F | 79°F | 15% | 9% | 13 h 10 min |
| August 15 | 100°F | 79°F | 15% | 9% | 13 h 10 min |
| August 16 | 100°F | 79°F | 16% | 9% | 13 h |
| August 17 | 100°F | 79°F | 16% | 10% | 13 h |
| August 18 | 100°F | 79°F | 17% | 10% | 13 h |
| August 19 | 100°F | 79°F | 17% | 10% | 13 h |
| August 20 | 100°F | 79°F | 18% | 11% | 13 h |
| August 21 | 99°F | 79°F | 19% | 11% | 13 h |
| August 22 | 99°F | 79°F | 19% | 12% | 13 h |
| August 23 | 99°F | 79°F | 20% | 12% | 12 h 50 min |
| August 24 | 99°F | 79°F | 20% | 12% | 12 h 50 min |
| August 25 | 99°F | 79°F | 21% | 13% | 12 h 50 min |
| August 26 | 98°F | 78°F | 21% | 13% | 12 h 50 min |
| August 27 | 98°F | 78°F | 22% | 14% | 12 h 50 min |
| August 28 | 98°F | 78°F | 22% | 14% | 12 h 50 min |
| August 29 | 98°F | 78°F | 23% | 15% | 12 h 50 min |
| August 30 | 98°F | 78°F | 23% | 15% | 12 h 40 min |
| August 31 | 97°F | 78°F | 24% | 16% | 12 h 40 min |
- Normal high
- 100°FAugust average
- Normal low
- 79°FAugust average
- Precipitation
- 1.81 inmonth total
- Days with precipitation
- 50.01 inch or more
- Days at 90°F or more
- 30
- Daylight
- 13 h 20 min to 12 h 40 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 31
- Sunshine
- 90%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 August?
On a given August day the chance of 0.01 inch or more is 17% on average, highest around August 31 (24%). In all, 1.81 in falls on 5 days of a normal August, 1 of them with an inch or more.
In a normal August in McAllen, 30 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00012959.
How humid and windy is McAllen in August?
At 3 p.m. the normal temperature is 94°F with 45% relative humidity and a dew point of 69°F; at 6 a.m. it is 78°F with 88% humidity. The wind averages 8.7 mph, most often from the east-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. | 78°F | 74°F | 88% | 5.2 mph | 85% |
| 9 a.m. | 85°F | 74°F | 72% | 9.2 mph | 75% |
| noon | 92°F | 71°F | 50% | 9.8 mph | 67% |
| 3 p.m. | 94°F | 69°F | 45% | 12.0 mph | 62% |
| 6 p.m. | 90°F | 70°F | 53% | 13.4 mph | 80% |
| 9 p.m. | 83°F | 73°F | 71% | 9.5 mph | 90% |
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 August in McAllen?
The warmest August temperature on McAllen's official record (since 1941) is 108°F, on August 10, 1988; the coldest is 64°F, on August 22, 1946. The wettest August brought 9.48 in (1980).
The August mean against the 1991-2020 normal of 89.3°F: 2021 87.1°F (−2.2), 2022 88.6°F (−0.7), 2023 90.5°F (+1.2), 2024 90.2°F (+0.9), 2025 90.1°F (+0.8), 2026 91.7°F (+2.4). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 87.1°F | −2.2°F | 0.32 in |
| 2022 | 88.6°F | −0.7°F | 1.71 in |
| 2023 | 90.5°F | +1.2°F | 0.39 in |
| 2024 | 90.2°F | +0.9°F | 1.45 in |
| 2025 | 90.1°F | +0.8°F | 0.35 in |
| 2026 | 91.7°F | +2.4°F | 2.29 in |
Source: records: ACIS, NWS threaded record MFEthr; recent months: ACIS, station USW00012959. Records and recent months use complete months only.
How does August in McAllen compare across Texas?
Across the 321 places PlainClimate covers in Texas, August normal highs run from 87°F in Marfa to 101°F in Del Rio; McAllen's is 100°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.