McAllen, TX weather in August
In August, McAllen sees highs around 100°F and lows around 79°F: very hot, oppressively humid and mostly dry. Expect about 5 wet days. It is one of the warmest months in McAllen. Plan outdoor time for mornings and evenings.
- Normal high
- 100°F
- Normal low
- 79°F
- Wet days
- 5
- 1.8 in total
- Muggy days
- 31
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 100°F | 97°F |
| Normal low | 79°F | 78°F |
| Chance of a wet day | 12% | 22% |
| Sunrise / sunset | 6:58 am / 8:19 pm | 7:12 am / 7:53 pm |
| Daylight | 13.3 h | 12.7 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 August day
- 6 am78°Fdew point 74°F
- 9 am86°Fdew point 74°F
- Noon94°Fdew point 70°F
- 3 pm96°Fdew point 69°F
- 6 pm92°Fdew point 70°F
- 9 pm84°Fdew point 73°F
NOAA hourly normals (local standard time) from Mcallen Miller Intl Airport (2 mi away); average wind 11 mph; clear or few clouds in 75% of daytime hours, mostly cloudy or overcast in 11%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more30 of 31
- Muggy daysdaily mean dew point 65°F or more31 of 31
- Wet daysat least 0.01 in of rain or melted snow5 of 31
- Notable rainat least 0.10 in3 of 31
- Freezing nightslow 32°F or below0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 1.8 in; a dry August brings about 0.5 in and a wet one about 3.1 in (25th and 75th percentiles). About 1 day brings half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202019: average high 103°F
- Coolest August2008: average high 94°F
- Wettest August2008: 6.8 in
- Driest August2018: 0.09 in
- Highest reading107°F (August 11, 2016)
- Lowest reading68°F (August 13, 2004)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
August compared with July and September
| July | August | September | |
|---|---|---|---|
| Normal high | 99°F | 100°F | 94°F |
| Normal low | 79°F | 79°F | 76°F |
| Wet days | 5 | 5 | 8 |
| Comfortable days | 0 | 0 | 0 |
| Daylight | 13.6 h | 13.0 h | 12.3 h |
Highs change by +1°F from July and -6°F into September.
Nearby alternatives in August
- Cooler: South Padre Island, TX66 mi · high 90°F · 6 wet days
How McAllen ranks in August
- Normal high14th warmest of 378 cities; 2nd of 38 in Texas
- Wet days86th driest of 378
- Comfortable days331st most of 341
What to pack for McAllen in August
- Light, breathable clothing – highs near 100°F and about 31 muggy days
Heating and cooling
August has 0 heating degree days and 752 cooling degree days (base 65°F), 14% of the year's total heating and cooling demand.
Questions
How hot is McAllen in August?
The normal high is 100°F and the normal low is 79°F. From 1991 to 2020 the hottest August reading was 107°F (most recently on August 11, 2016).
Does it rain a lot in McAllen in August?
About 5 days in August have at least 0.01 in of precipitation, and the normal total is 1.8 in. The wettest August in 1991-2020 was in 2008 (6.9 in); the driest was in 2018 (0.09 in).
Is August a good time to visit McAllen?
August ranks 11th of 12 months on our comfort score for McAllen (34 out of 100). It has almost no comfortable days and about 30 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.