Climate averages 1991–2020
McKinney weather
in August.
A hot, moderately wet month: the warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in McKinney: daytime highs average 33.9°C and nights cool to about 24.8°C. By daytime temperature it is the warmest month of the year.
Expect about 50 mm of rain on roughly 6 days, which makes August a moderately wet month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 13 h 23 min on an average August day.
The nearest other city in this atlas is Allen (12 km away). In August its highs average 33.9°C, about as warm as McKinney, with 53 mm of rain.
Among the 498 cities listed in the United States, McKinney ranks joint 68th of 498 for the warmest August highs and joint 191st of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; McKinney is 4.0°C warmer than that mean.
From August to September, average highs fall by 3.9°C to 30.0°C, and monthly rainfall rises from 50 mm to 78 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
McKinney climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 12.2°C3.0°C | 3.0°C | 70 | 6.8 | 10.210 h |
| February | 14.7°C5.0°C | 5.0°C | 74 | 7.6 | 11.011 h |
| March | 18.8°C8.9°C | 8.9°C | 105 | 9.4 | 12.012 h |
| April | 23.1°C13.1°C | 13.1°C | 118 | 9.1 | 13.013 h |
| May | 27.1°C18.1°C | 18.1°C | 144 | 11.5 | 13.914 h |
| June | 31.2°C22.4°C | 22.4°C | 91 | 9.1 | 14.314 h |
| July | 33.8°C24.8°C | 24.8°C | 50 | 6.2 | 14.114 h |
| August, selected | 33.9°C24.8°C | 24.8°C | 50 | 5.8 | 13.413 h |
| September | 30.0°C20.9°C | 20.9°C | 78 | 6.8 | 12.412 h |
| October | 24.4°C14.9°C | 14.9°C | 104 | 7.9 | 11.411 h |
| November | 17.9°C8.9°C | 8.9°C | 94 | 7.2 | 10.510 h |
| December | 13.1°C4.3°C | 4.3°C | 94 | 7.2 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Allen in AugustUnited States · 12 kmHigh 33.9°C · Low 24.9°C · 53 mm rain
- Frisco in AugustUnited States · 20 kmHigh 33.9°C · Low 24.8°C · 49 mm rain
- Plano in AugustUnited States · 21 kmHigh 33.9°C · Low 24.9°C · 53 mm rain
- Richardson in AugustUnited States · 30 kmHigh 34.0°C · Low 25.0°C · 53 mm rain
- Garland in AugustUnited States · 32 kmHigh 34.1°C · Low 25.0°C · 53 mm rain
- Carrollton in AugustUnited States · 37 kmHigh 34.2°C · Low 25.3°C · 51 mm rain
- Lewisville in AugustUnited States · 39 kmHigh 34.3°C · Low 25.3°C · 51 mm rain
- Mesquite in AugustUnited States · 48 kmHigh 34.3°C · Low 25.1°C · 53 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for McKinney) is explained once on the McKinney year overview and on the Sources, method and limits page.