Generally, average temperature in Boise during the month of May is 13. Through the month the highs are about 23 and average daily low being 7. We have provided a clearer breakdown here:
| Month | Degrees Celsius |
|---|---|
| Temperature | 13 |
| High Temperature | 23 |
| Low Temperature | 7 |
Useful Links: Boise Weather: Average Weather & Yearly Climate