The official National Weather Service forecast for Bloomsdale — 38.0095°N, 90.2179°W, 3.2 miles from I-55. Forecasts here are written by NWS LSX, this county’s forecast office.
| Ste. Genevieve County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 42 | 47 | 58 | 68 | 77 | 85 | 88 | 87 | 81 | 70 | 56 | 46 | 67 |
| Avg low °F | 23 | 27 | 35 | 45 | 55 | 63 | 67 | 65 | 57 | 46 | 35 | 27 | 45 |
| Precip in | 2.8 | 2.9 | 4.2 | 5.1 | 5.2 | 4.0 | 4.2 | 3.4 | 2.9 | 3.2 | 3.4 | 2.9 | 44.2 |
1996–2025 normals for Ste. Genevieve County — the climate division Bloomsdale sits in. All-time county record high 108.3°F (2012-06-29); record low -16.7°F (1977-01-17). Source: NOAA / National Weather Service.