Keystone, SD Weather Forecast
Local 7-day forecast
Slight Chance Light Rain then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Keystone, SD in one place.
A slight chance of rain before noon. Mostly sunny. High near 53, with temperatures falling to around 48 in the afternoon. North wind 10 to 16 mph, with gusts as high as 36 mph. Chance of precipitation is 20%.
Local Weather Overview
This forecast page for Keystone, SD is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Oct 14, 2026 4:51 AM MDT.
The active forecast window currently covers Oct 15 to Oct 20, 2026 for Keystone, SD.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 15 to Oct 20, 2026
- Latest sync
- Oct 14, 2026 4:51 AM MDT
- Forecast office
- UNR
- Source
- NOAA / NWS
Daily Outlook
This Week in Keystone
Saturday looks like the warmest upcoming period in Keystone at 75 degrees F.
Thursday Night is the coolest period ahead with temperatures near 29 degrees F.
The strongest winds are forecast for Thursday at about 10 to 16 mph N.
Precipitation is mentioned in 1 upcoming forecast period.
Forecast Details
- Last updated
- Oct 14, 2026 4:51 AM MDT
- Coverage
- 6 days
- Time zone
- America/Denver
- Forecast office
- UNR
- Radar station
- KUDX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Clear, with a low around 29. Northwest wind 3 to 15 mph, with gusts as high as 32 mph.
Sunny. High near 58, with temperatures falling to around 53 in the afternoon. Southwest wind 2 to 8 mph, with gusts as high as 24 mph.
Clear, with a low around 48.
Sunny, with a high near 75.
Mostly clear, with a low around 53.
Sunny, with a high near 67.
Mostly clear, with a low around 47.
Sunny, with a high near 69.
Mostly clear, with a low around 52.
Sunny, with a high near 70.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Thursday
Oct 15
|
Slight Chance Light Rain then Mostly Sunny
|
53°F |
10 to 16 mph
N
|
|
Thursday Night
Oct 15
|
Clear
|
29°F |
3 to 15 mph
NW
|
|
Friday
Oct 16
|
Sunny
|
58°F |
2 to 8 mph
SW
|
|
Friday Night
Oct 16
|
Clear
|
48°F |
8 to 13 mph
SW
|
|
Saturday
Oct 17
|
Sunny
|
75°F |
2 to 10 mph
W
|
|
Saturday Night
Oct 17
|
Mostly Clear
|
53°F |
2 to 10 mph
W
|
|
Sunday
Oct 18
|
Sunny
|
67°F |
3 to 9 mph
N
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
47°F |
5 mph
NW
|
|
Monday
Oct 19
|
Sunny
|
69°F |
5 to 8 mph
SW
|
|
Monday Night
Oct 19
|
Mostly Clear
|
52°F |
3 to 8 mph
SW
|
|
Tuesday
Oct 20
|
Sunny
|
70°F |
7 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Keystone.
