The temperatures in Keystone in May are comfortable with low of 15°C and and high up to 22°C.
You can expect up to 3 rainy days in Keystone during the month of May.
Our weather forecast can give you a great sense of what weather to expect in Keystone in May 2025.
If you’re planning to visit Keystone in the near future, we highly recommend that you review the 14 day weather forecast for Keystone before you arrive.
Temperatures
22° / 15°
Rainy Days
1
Snowy Days
0
Dry Days
31
Rainfall
9
mm
Sun Hours
10.3
Hrs
