Keystone weather in October 2025

Expect 16°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Keystone in October. Check more long-term weather averages for Keystone in October before you book your next holiday to South Dakota in 2025/2026.

  • 16°C maximum daytime temperature in October in Keystone16
    16°C max day temperature
  • 7 hours of sunshine per day
  • 6 days with some rainfall in October in Keystone6
    6 days with some rainfall
  • 1°C minimum night-time temperature in October in Keystone1
    1°C min night temperature
  • 11 hours of daylight per day in October in Keystone11
    11 hours of daylight per day
  • No heat & humidity in October in Keystone0
    No heat & humidity
  • 25 mm monthly rainfall in October in Keystone25
    25 mm of monthly rainfall
  • UV (maximum) index 3 (Moderate) in October in Keystone3
    3 (Moderate) UV index

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Recommended for South Dakota

  • Kids stay & eat for free at Marriot Bonvoy
  • Destinations include Europe, Middle East & Africa
  • Valid for up to 2 adults & 2 kids aged up to 12

The October weather guide for South Dakota (Keystone) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How warm is it in Keystone in October?

Daytime temperatures usually reach 16°C in Keystone in October, falling to 1°C at night.

How sunny is it in Keystone in October?

There are normally 7 hours of bright sunshine each day in Keystone in October - that's 65% of daylight hours.

Does it rain in Keystone in October?

There are usually 6 days with some rain in Keystone in October and the average monthly rainfall is 25mm.

Keystone October sunrise & sunset times

Browse the sunrise and sunset times for Keystone in October 2025. Select a month to view Keystone sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Wednesday, 1st October 2025 05:52 17:34
Thursday, 16th October 2025 06:10 17:08
Friday, 31st October 2025 06:29 16:45

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