Dewey County, SD Weather Forecast
County weather hub
Sunny
Compare major city weather across Dewey County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Sunny, with a high near 100. Heat index values as high as 99. South southeast wind around 16 mph, with gusts as high as 24 mph.
County Weather Overview
This county weather page brings together forecast coverage for Dewey County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 1 of 1 mapped cities in Dewey County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Jul 16 to Jul 22, 2026
- Latest sync
- Jul 16, 2026 3:17 PM MDT
- Forecast office
- ABR
- Source
- NOAA / NWS
Daily Outlook
This Week in Dewey County
Sunday looks like the warmest upcoming period in Dewey County at 101 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 62 degrees F.
The strongest winds are forecast for Monday at about 9 to 20 mph N.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 16, 2026 3:17 PM MDT
- Coverage
- 8 days
- Time zone
- America/Denver
- Forecast office
- ABR
- Radar station
- KBIS
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 71. South southeast wind 8 to 16 mph.
Sunny, with a high near 97. North northeast wind 10 to 16 mph.
Partly cloudy, with a low around 67. East northeast wind 12 to 16 mph, with gusts as high as 24 mph.
Mostly sunny, with a high near 93. East southeast wind 10 to 14 mph.
A slight chance of showers and thunderstorms after midnight. Mostly cloudy, with a low around 70. Southeast wind 14 to 17 mph, with gusts as high as 26 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before noon. Mostly sunny, with a high near 101. South wind 12 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 70. North northwest wind 7 to 10 mph. Chance of precipitation is 20%.
Mostly sunny, with a high near 97. North wind 9 to 20 mph, with gusts as high as 28 mph.
Mostly clear, with a low around 65.
Mostly sunny, with a high near 85.
A slight chance of rain showers after midnight. Partly cloudy, with a low around 62. Chance of precipitation is 20%.
A chance of rain showers. Mostly sunny, with a high near 82. Chance of precipitation is 30%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
Jul 16
|
Sunny
|
100°F |
16 mph
SSE
|
|
Tonight
Jul 16
|
Mostly Clear
|
71°F |
8 to 16 mph
SSE
|
|
Friday
Jul 17
|
Sunny
|
97°F |
10 to 16 mph
NNE
|
|
Friday Night
Jul 17
|
Partly Cloudy
|
67°F |
12 to 16 mph
ENE
|
|
Saturday
Jul 18
|
Mostly Sunny
|
93°F |
10 to 14 mph
ESE
|
|
Saturday Night
Jul 18
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
70°F |
14 to 17 mph
SE
|
|
Sunday
Jul 19
|
Slight Chance Showers And Thunderstorms then Mostly Sunny
|
101°F |
12 to 16 mph
S
|
|
Sunday Night
Jul 19
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
70°F |
7 to 10 mph
NNW
|
|
Monday
Jul 20
|
Mostly Sunny
|
97°F |
9 to 20 mph
N
|
|
Monday Night
Jul 20
|
Mostly Clear
|
65°F |
13 to 20 mph
NNE
|
|
Tuesday
Jul 21
|
Mostly Sunny
|
85°F |
14 mph
NNE
|
|
Tuesday Night
Jul 21
|
Partly Cloudy then Slight Chance Rain Showers
|
62°F |
12 mph
E
|
|
Wednesday
Jul 22
|
Chance Rain Showers
|
82°F |
9 to 13 mph
SE
|
|
Wednesday Night
Jul 22
|
Chance Showers And Thunderstorms
|
62°F |
8 to 12 mph
ESE
|
Major City Forecasts
Live forecast snapshots for major cities across Dewey County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Dewey County.
Largest mapped city population in this region: 1,418.
