The official National Weather Service forecast for Tri-Lakes — 41.2459°N, 85.4419°W, 15.8 miles from I-69. Forecasts here are written by NWS IWX, this county’s forecast office.
| Whitley County | J | F | M | A | M | J | J | A | S | O | N | D | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high °F | 32 | 37 | 48 | 61 | 72 | 81 | 84 | 81 | 77 | 64 | 49 | 38 | 60 |
| Avg low °F | 18 | 20 | 29 | 38 | 49 | 59 | 62 | 60 | 53 | 42 | 32 | 23 | 40 |
| Precip in | 2.4 | 2.1 | 2.6 | 3.6 | 4.4 | 4.3 | 4.2 | 4.0 | 2.8 | 2.9 | 2.6 | 2.5 | 38.4 |
1996–2025 normals for Whitley County — the climate division Tri-Lakes sits in. All-time county record high 103.1°F (2012-06-29); record low -21.1°F (1985-01-21). Source: NOAA / National Weather Service.