Best time to visit Keystone, SD
A month-by-month travel weather guide based on NOAA 30-year climate normals.
The most comfortable travel window in Keystone runs from May through September — 5 months of pleasant temperatures and modest rainfall.
Winter weather. Plan around weather; good for snow sports if applicable.
Daylight ≈ 9h 4m
Winter weather. Plan around weather; good for snow sports if applicable.
Daylight ≈ 10h 15m
Winter weather. Plan around weather; good for snow sports if applicable.
Daylight ≈ 11h 41m
Mild but on the chilly side. Pack a jacket; great for hiking and city walks.
Daylight ≈ 13h 13m
Comfortable for most activities. Bring layers; nights can be cool.
Daylight ≈ 14h 33m
Sweet spot — comfortable highs in the 65-80°F range, mild nights, low rain. Ideal for nearly any outdoor plan.
Daylight ≈ 15h 14m
Sweet spot — comfortable highs in the 65-80°F range, mild nights, low rain. Ideal for nearly any outdoor plan.
Daylight ≈ 14h 58m
Sweet spot — comfortable highs in the 65-80°F range, mild nights, low rain. Ideal for nearly any outdoor plan.
Daylight ≈ 13h 49m
Comfortable for most activities. Bring layers; nights can be cool.
Daylight ≈ 12h 17m
Mild but on the chilly side. Pack a jacket; great for hiking and city walks.
Daylight ≈ 10h 45m
Winter weather. Plan around weather; good for snow sports if applicable.
Daylight ≈ 9h 24m
Winter weather. Plan around weather; good for snow sports if applicable.
Daylight ≈ 8h 44m
Looking for similar climates? See Keystone's climate twins. Or jump straight to the full climate profile.