Climate averages 1991–2020
Richardson weather
in August.
A very hot, moderately wet month: one of the warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a very hot month in Richardson: daytime highs average 34.0°C and nights cool to about 25.0°C. By daytime temperature it is one of the warmest months 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 Plano (8 km away). In August its highs average 33.9°C, about as warm as Richardson, with 53 mm of rain.
Among the 498 cities listed in the United States, Richardson ranks joint 64th 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; Richardson is 4.1°C warmer than that mean.
From August to September, average highs fall by 3.8°C to 30.2°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
Richardson climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 12.7°C3.4°C | 3.4°C | 70 | 6.8 | 10.210 h |
| February | 15.1°C5.3°C | 5.3°C | 73 | 7.5 | 11.011 h |
| March | 19.1°C9.1°C | 9.1°C | 100 | 9.2 | 12.012 h |
| April | 23.5°C13.4°C | 13.4°C | 110 | 8.4 | 13.013 h |
| May | 27.4°C18.3°C | 18.3°C | 138 | 11.1 | 13.814 h |
| June | 31.4°C22.6°C | 22.6°C | 86 | 8.4 | 14.314 h |
| July | 34.0°C24.9°C | 24.9°C | 46 | 5.9 | 14.114 h |
| August, selected | 34.0°C25.0°C | 25.0°C | 53 | 5.3 | 13.413 h |
| September | 30.2°C21.1°C | 21.1°C | 71 | 6.2 | 12.412 h |
| October | 24.7°C15.2°C | 15.2°C | 99 | 7.8 | 11.411 h |
| November | 18.3°C9.2°C | 9.2°C | 93 | 7.0 | 10.510 h |
| December | 13.6°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
- Plano in AugustUnited States · 8 kmHigh 33.9°C · Low 24.9°C · 53 mm rain
- Garland in AugustUnited States · 9 kmHigh 34.1°C · Low 25.0°C · 53 mm rain
- Carrollton in AugustUnited States · 15 kmHigh 34.2°C · Low 25.3°C · 51 mm rain
- Allen in AugustUnited States · 18 kmHigh 33.9°C · Low 24.9°C · 53 mm rain
- Dallas in AugustUnited States · 20 kmHigh 34.5°C · Low 25.4°C · 53 mm rain
- Mesquite in AugustUnited States · 24 kmHigh 34.3°C · Low 25.1°C · 53 mm rain
- Frisco in AugustUnited States · 24 kmHigh 33.9°C · Low 24.8°C · 49 mm rain
- Irving in AugustUnited States · 25 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 Richardson) is explained once on the Richardson year overview and on the Sources, method and limits page.
Plano, Garland 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.