The official National Weather Service forecast for Richardson — 32.9482°N, 96.7297°W, 3.1 miles from I-635. Forecasts here are written by NWS FWD, this county’s forecast office.
| Dallas County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 57 | 61 | 69 | 76 | 84 | 92 | 96 | 96 | 90 | 79 | 68 | 59 | 77 |
| Avg low °F | 36 | 39 | 48 | 55 | 64 | 72 | 75 | 75 | 68 | 57 | 47 | 38 | 56 |
| Precip in | 2.6 | 2.8 | 3.6 | 3.7 | 4.9 | 3.8 | 1.9 | 2.5 | 2.8 | 4.5 | 3.0 | 2.8 | 38.9 |
1996–2025 normals for Dallas County — the climate division Richardson sits in. All-time county record high 109.9°F (2011-08-04); record low 0.7°F (2021-02-16). Source: NOAA / National Weather Service.