Mellette County, SD Weather Forecast

County weather hub

70°

Partly Cloudy

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Saturday, July 18, 2026

Wind: 10 mph NE

Overnight

Partly cloudy, with a low around 70. Northeast wind around 10 mph, with gusts as high as 20 mph.

County weather hub

County Weather Overview

This county weather page brings together forecast coverage for Mellette County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.

Current forecast coverage spans 0 of 0 mapped cities in Mellette County.

Page Snapshot

Page focus: county weather
Forecast window: Jul 18 to Jul 24, 2026
Latest sync: Jul 18, 2026 7:24 AM CDT
Forecast office: UNR
Source: NOAA / NWS

Next High

96°F

Saturday

Next Low

70°F

Overnight

Rain Outlook

Periods mentioning precipitation

Windiest

10 to 21 mph

Monday

Daily Outlook

Today

Jul 18

Mostly Sunny

96 °F

/ 70°F

Wind 13 mph

Sun

Jul 19

Slight Chance Showers And Thunderstorms then Mostly Sunny

103 °F

/ 74°F

Wind 8 to 12 mph

Mon

Jul 20

Sunny

100 °F

/ 67°F

Wind 10 to 21 mph

Tue

Jul 21

Mostly Sunny

88 °F

/ 63°F

Wind 7 to 16 mph

Wed

Jul 22

Chance Showers And Thunderstorms

84 °F

/ 63°F

Wind 9 to 20 mph

Thu

Jul 23

Chance Showers And Thunderstorms

88 °F

/ 63°F

Wind 13 mph

Fri

Jul 24

Slight Chance Showers And Thunderstorms then Partly Sunny

88 °F

Wind 6 to 14 mph

This Week in Mellette County

Sunday looks like the warmest upcoming period in Mellette County at 103 degrees F.

Tuesday Night is the coolest period ahead with temperatures near 63 degrees F.

The strongest winds are forecast for Monday at about 10 to 21 mph NW.

Precipitation is mentioned in 8 upcoming forecast periods.

Forecast Details

Last updated: Jul 18, 2026 7:24 AM CDT
Coverage: 7 days
Time zone: America/Chicago
Forecast office: UNR
Radar station: KUDX

Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.

Open NOAA source

Extended Forecast

Saturday

Jul 18

96°F

Mostly Sunny

13 mph E

Mostly sunny, with a high near 96. East wind around 13 mph, with gusts as high as 22 mph.

Saturday Night

Jul 18

72°F

Partly Cloudy then Slight Chance Showers And Thunderstorms

8 to 13 mph SE

A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. Southeast wind 8 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

Sunday

Jul 19

103°F

Slight Chance Showers And Thunderstorms then Mostly Sunny

8 to 12 mph S

A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 103. Heat index values as high as 103. South wind 8 to 12 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

Sunday Night

Jul 19

74°F

Mostly Clear

10 to 16 mph S

Mostly clear. Low around 74, with temperatures rising to around 76 overnight. South wind 10 to 16 mph, with gusts as high as 28 mph.

Monday

Jul 20

100°F

Sunny

10 to 21 mph NW

Sunny, with a high near 100. Northwest wind 10 to 21 mph, with gusts as high as 30 mph.

Monday Night

Jul 20

67°F

Mostly Clear

7 to 21 mph N

Mostly clear, with a low around 67.

Tuesday

Jul 21

88°F

Mostly Sunny

7 to 16 mph N

Mostly sunny, with a high near 88.

Tuesday Night

Jul 21

63°F

Partly Cloudy then Slight Chance Showers And Thunderstorms

9 to 14 mph E

A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63.

Wednesday

Jul 22

84°F

Chance Showers And Thunderstorms

9 to 20 mph SE

A chance of showers and thunderstorms. Partly sunny, with a high near 84.

Wednesday Night

Jul 22

63°F

Chance Showers And Thunderstorms

10 to 20 mph SE

A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 63.

Thursday

Jul 23

88°F

Chance Showers And Thunderstorms

13 mph SE

A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with a high near 88.

Thursday Night

Jul 23

63°F

Chance Showers And Thunderstorms

6 to 13 mph SE

A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.

Friday

Jul 24

88°F

Slight Chance Showers And Thunderstorms then Partly Sunny

6 to 14 mph S

A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 88.

Detailed Forecast

Period	Conditions	Temp	Wind	Details
Overnight Jul 18	Partly Cloudy	70°F	10 mph NE	Partly cloudy, with a low around 70. Northeast wind around 10 mph, with gusts as high as 20 mph.
Saturday Jul 18	Mostly Sunny	96°F	13 mph E	Mostly sunny, with a high near 96. East wind around 13 mph, with gusts as high as 22 mph.
Saturday Night Jul 18	Partly Cloudy then Slight Chance Showers And Thunderstorms	72°F	8 to 13 mph SE	A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. Southeast wind 8 to 13 mph,...
Sunday Jul 19	Slight Chance Showers And Thunderstorms then Mostly Sunny	103°F	8 to 12 mph S	A slight chance of showers and thunderstorms before 7am. Mostly sunny, with a high near 103. Heat index values as high a...
Sunday Night Jul 19	Mostly Clear	74°F	10 to 16 mph S	Mostly clear. Low around 74, with temperatures rising to around 76 overnight. South wind 10 to 16 mph, with gusts as hig...
Monday Jul 20	Sunny	100°F	10 to 21 mph NW	Sunny, with a high near 100. Northwest wind 10 to 21 mph, with gusts as high as 30 mph.
Monday Night Jul 20	Mostly Clear	67°F	7 to 21 mph N	Mostly clear, with a low around 67.
Tuesday Jul 21	Mostly Sunny	88°F	7 to 16 mph N	Mostly sunny, with a high near 88.
Tuesday Night Jul 21	Partly Cloudy then Slight Chance Showers And Thunderstorms	63°F	9 to 14 mph E	A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63.
Wednesday Jul 22	Chance Showers And Thunderstorms	84°F	9 to 20 mph SE	A chance of showers and thunderstorms. Partly sunny, with a high near 84.
Wednesday Night Jul 22	Chance Showers And Thunderstorms	63°F	10 to 20 mph SE	A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low...
Thursday Jul 23	Chance Showers And Thunderstorms	88°F	13 mph SE	A chance of showers and thunderstorms before 1pm, then a slight chance of showers and thunderstorms. Partly sunny, with...
Thursday Night Jul 23	Chance Showers And Thunderstorms	63°F	6 to 13 mph SE	A chance of showers and thunderstorms. Mostly cloudy, with a low around 63.
Friday Jul 24	Slight Chance Showers And Thunderstorms then Partly Sunny	88°F	6 to 14 mph S	A slight chance of showers and thunderstorms before 7am. Partly sunny, with a high near 88.

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Weather data provided by the National Weather Service (NOAA). Forecast pages update automatically as new periods are synced for each supported U.S. location.