Keystone weather in October 2025

Expect daytime maximum temperatures of 16°C in Keystone, South Dakota in October based on long-term weather averages. There are 7 hours of sunshine per day on average.

  • 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

More about Keystone

Keystone by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for South Dakota

Cosmos: up to £900 savings on 2026 tours

  • Save up to £900 per couple on 2026 tours worldwide
  • Discount varies by destination. T&Cs apply
  • Travel between 1st Jan & 31st Dec 2026 (inclusive)
Go to Cosmos deal >>

Expires at 23:59 on Tuesday 30th Sep 2025 · View all Cosmos offers

CosmosTour deal finder

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)

Back to top

More about the USA

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^