Climate averages 1991–2020
Plano weather
in August.
A hot, moderately wet month: the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Plano: daytime highs average 33.9°C and nights cool to about 24.9°C. By daytime temperature it is the warmest month of the year.
Expect about 53 mm of rain on roughly 5 days, which makes August a moderately wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 22 min on an average August day.
The nearest other city in this atlas is Richardson (8 km away). In August its highs average 34.0°C, about as warm as Plano, with 53 mm of rain.
Among the 498 cities listed in the United States, Plano ranks joint 68th of 498 for the warmest August highs and joint 197th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; Plano is 4.0°C warmer than that mean.
From August to September, average highs fall by 3.8°C to 30.1°C, and monthly rainfall rises from 53 mm to 71 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
Plano climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 12.5°C3.3°C | 3.3°C | 70 | 6.8 | 10.210 h |
| February | 14.9°C5.2°C | 5.2°C | 73 | 7.5 | 11.011 h |
| March | 19.0°C9.1°C | 9.1°C | 100 | 9.2 | 12.012 h |
| April | 23.3°C13.4°C | 13.4°C | 110 | 8.4 | 13.013 h |
| May | 27.2°C18.2°C | 18.2°C | 138 | 11.1 | 13.814 h |
| June | 31.3°C22.6°C | 22.6°C | 86 | 8.4 | 14.314 h |
| July | 33.8°C24.9°C | 24.9°C | 46 | 5.9 | 14.114 h |
| August, selected | 33.9°C24.9°C | 24.9°C | 53 | 5.3 | 13.413 h |
| September | 30.1°C21.0°C | 21.0°C | 71 | 6.2 | 12.412 h |
| October | 24.6°C15.1°C | 15.1°C | 99 | 7.8 | 11.411 h |
| November | 18.1°C9.1°C | 9.1°C | 93 | 7.0 | 10.510 h |
| December | 13.4°C4.6°C | 4.6°C | 91 | 7.1 | 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
- Richardson in AugustUnited States · 8 kmHigh 34.0°C · Low 25.0°C · 53 mm rain
- Allen in AugustUnited States · 10 kmHigh 33.9°C · Low 24.9°C · 53 mm rain
- Garland in AugustUnited States · 13 kmHigh 34.1°C · Low 25.0°C · 53 mm rain
- Frisco in AugustUnited States · 19 kmHigh 33.9°C · Low 24.8°C · 49 mm rain
- Carrollton in AugustUnited States · 19 kmHigh 34.2°C · Low 25.3°C · 51 mm rain
- McKinney in AugustUnited States · 21 kmHigh 33.9°C · Low 24.8°C · 50 mm rain
- Lewisville in AugustUnited States · 28 kmHigh 34.3°C · Low 25.3°C · 51 mm rain
- Dallas in AugustUnited States · 28 kmHigh 34.5°C · Low 25.4°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 Plano) is explained once on the Plano year overview and on the Sources, method and limits page.
Garland, Richardson and Allen lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.