Boise Climate: Weather by Month and Best Time to Visit
Best months for Boise: September, June, May.
Year at a glance
Weather by month
| Month | Avg high | Avg low | Rainfall | Rainy days | Humidity | Sunshine | Score |
|---|---|---|---|---|---|---|---|
| January | 5°C | -3°C | 46 mm | 10 | – | – | 4.7 |
| February | 8°C | -1°C | 31 mm | 8 | – | – | 5.6 |
| March | 14°C | 3°C | 36 mm | 9 | – | – | 6.6 |
| April | 18°C | 5°C | 31 mm | 7 | – | – | 7.5 |
| May | 24°C | 9°C | 31 mm | 6 | – | – | 8.3 |
| June | 29°C | 13°C | 16 mm | 3 | – | – | 8.7 |
| July | 35°C | 17°C | 3 mm | 1 | – | – | 7.4 |
| August | 34°C | 17°C | 3 mm | 1 | – | – | 7.6 |
| September | 28°C | 12°C | 10 mm | 2 | – | – | 8.8 |
| October | 19°C | 6°C | 22 mm | 4 | – | – | 8.1 |
| November | 10°C | 1°C | 34 mm | 8 | – | – | 6.0 |
| December | 4°C | -2°C | 50 mm | 10 | – | – | 4.6 |