The official National Weather Service forecast for Riverton — 40.5219°N, 111.9391°W, 2.5 miles from I-15. Forecasts here are written by NWS SLC, this county’s forecast office.
| Salt Lake County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 37 | 41 | 50 | 57 | 67 | 79 | 88 | 85 | 76 | 61 | 48 | 38 | 61 |
| Avg low °F | 21 | 23 | 30 | 35 | 44 | 53 | 62 | 59 | 51 | 39 | 29 | 22 | 39 |
| Precip in | 2.3 | 2.1 | 2.4 | 2.6 | 2.1 | 1.1 | 0.6 | 1.1 | 1.4 | 1.9 | 1.8 | 2.4 | 21.8 |
1996–2025 normals for Salt Lake County — the climate division Riverton sits in. All-time county record high 101.9°F (2026-07-13); record low -15.5°F (1990-12-23). Source: NOAA / National Weather Service.