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Best Time for Idaho: Boise, Stanley & the Sawtooths
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Sweet spot: May, June, September. Computed from NASA POWER climate normals across the route's overnight towns, balancing temperature, rainfall and daylight.
💡 Good to know
- The Ponderosa Pine and Sawtooth scenic byways, Redfish Lake and public town stops form the baseline. Check Idaho 511, wildfire, smoke, forest restrictions, trail status and early snow; rafting, boats, hot springs, lifts and guided activities remain optional.
| Month | Low | High | Rain | Daylight | |
|---|---|---|---|---|---|
| January | −10.8°C | −1.5°C | 70 mm | 9.1 h | ❄ |
| February | −10.0°C | −0.3°C | 52 mm | 10.2 h | ❄ |
| March | −5.9°C | 4.2°C | 67 mm | 11.6 h | ❄ |
| April | −2.5°C | 9.1°C | 48 mm | 13.2 h | ❄ |
| May | 2.7°C | 15.8°C | 47 mm | 14.5 h | ❄ |
| June | 7.2°C | 21.5°C | 31 mm | 15.2 h | |
| July | 12.9°C | 28.6°C | 12 mm | 14.9 h | |
| August | 11.9°C | 27.4°C | 12 mm | 13.8 h | |
| September | 6.9°C | 21.5°C | 23 mm | 12.3 h | |
| October | 0.1°C | 12.3°C | 40 mm | 10.8 h | ❄ |
| November | −5.6°C | 3.9°C | 58 mm | 9.4 h | ❄ |
| December | −10.8°C | −1.7°C | 90 mm | 8.8 h | ❄ |