McKinney, TX weather in August
In August, McKinney sees highs around 96°F and lows around 73°F: hot, humid and mostly dry. There are about 6 days with rain. It is one of the warmest months in McKinney. Plan outdoor time for mornings and evenings.
- Normal high
- 96°F
- Normal low
- 73°F
- Wet days
- 6
- 2.7 in total
- Muggy days
- 24
- dew point 65°F+
How August changes from start to finish
| August 1 | August 31 | |
|---|---|---|
| Normal high | 97°F | 93°F |
| Normal low | 75°F | 70°F |
| Chance of a wet day | 17% | 20% |
| Sunrise / sunset | 6:39 am / 8:26 pm | 7:00 am / 7:53 pm |
| Daylight | 13.8 h | 12.9 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 am77°Fdew point 69°F
- 9 am84°Fdew point 69°F
- Noon91°Fdew point 68°F
- 3 pm94°Fdew point 66°F
- 6 pm92°Fdew point 65°F
- 9 pm85°Fdew point 67°F
NOAA hourly normals (local standard time) from Dallas Ft Worth Airport (31 mi away); average wind 9 mph; clear or few clouds in 38% of daytime hours, mostly cloudy or overcast in 32%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F0 of 31
- Hot dayshigh 90°F or more27 of 31
- Muggy daysdaily mean dew point 65°F or more24 of 31
- Wet daysat least 0.01 in of rain or melted snow6 of 31
- Notable rainat least 0.10 in4 of 31
- Freezing nightslow 32°F or below0 of 31
- Snow on the groundsnow depth 1 in or more0 of 31
Average days per August, counted from daily records for each year 1991-2020.
Rain in August
Normal precipitation is 2.7 in; a dry August brings about 0.7 in and a wet one about 4.6 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How August varies from year to year
- Warmest August, 1991-20202011: average high 104°F
- Coolest August2017: average high 90°F
- Wettest August1994: 9.0 in
- Driest August2000: no measurable precipitation
- Highest reading109°F (August 3, 2011)
- Lowest reading54°F (August 12, 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 | 95°F | 96°F | 88°F |
| Normal low | 74°F | 73°F | 66°F |
| Wet days | 5 | 6 | 6 |
| Comfortable days | 0 | 0 | 2 |
| Daylight | 14.1 h | 13.3 h | 12.4 h |
Highs change by +1°F from July and -8°F into September.
Nearby alternatives in August
- Cooler: Fayetteville, AR242 mi · high 89°F · 8 wet days
How McKinney ranks in August
- Normal high49th warmest of 378 cities; 24th of 38 in Texas
- Wet days109th driest of 378
- Comfortable days332nd most of 341
What to pack for McKinney in August
- Light, breathable clothing – highs near 96°F and about 24 muggy days
Heating and cooling
August has 0 heating degree days and 598 cooling degree days (base 65°F), 12% of the year's total heating and cooling demand.
Questions
How hot is McKinney in August?
The normal high is 96°F and the normal low is 73°F. From 1991 to 2020 the hottest August reading was 109°F (most recently on August 3, 2011).
Does it rain a lot in McKinney in August?
About 6 days in August have at least 0.01 in of precipitation, and the normal total is 2.7 in. The wettest August in 1991-2020 was in 1994 (9.0 in); the driest was in 2000, with no measurable precipitation.
Is August a good time to visit McKinney?
August ranks 12th of 12 months on our comfort score for McKinney (36 out of 100). It has almost no comfortable days and about 27 days at 90°F or hotter. The best months are March and April.
Where the numbers come from
- Temperature and frost dates: Mckinney Muni Airport (USW00053914), 1.9 mi SE of the city center, 580 ft (50 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Rain, snowfall and snow depth: Frisco (USC00413370), 10 mi W of the city center, 747 ft (117 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour and cloud cover: Dallas Ft Worth Airport (USW00003927), 31 mi SW of the city center, 560 ft (70 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Dallas/Ft Worth International Airport (722590-03927), 31 mi SW of the city center, 544 ft (86 ft lower than the city). Hourly observations, 1991-2020.