The official National Weather Service forecast for Altoona — 28.9658°N, 81.6487°W, 21.8 miles from I-4. Forecasts here are written by NWS MLB, this county’s forecast office.
| Lake County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 70 | 74 | 79 | 83 | 89 | 91 | 92 | 92 | 89 | 84 | 77 | 73 | 83 |
| Avg low °F | 47 | 51 | 55 | 59 | 66 | 71 | 73 | 74 | 72 | 64 | 56 | 51 | 62 |
| Precip in | 2.4 | 2.3 | 2.9 | 2.4 | 3.5 | 7.5 | 7.5 | 7.4 | 6.5 | 2.8 | 2.0 | 2.5 | 49.7 |
1996–2025 normals for Lake County — the climate division Altoona sits in. All-time county record high 100.5°F (1998-06-19); record low 17.0°F (1962-12-13). Source: NOAA / National Weather Service.