Sullivan County, TN Weather Forecast
County weather hub
Mostly Clear
Compare major city weather across Sullivan County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly clear, with a low around 59. South wind around 0 mph.
County Weather Overview
This county weather page brings together forecast coverage for Sullivan County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 4 of 4 mapped cities in Sullivan County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Aug 24 to Aug 30, 2026
- Latest sync
- Aug 24, 2026 6:20 AM EDT
- Forecast office
- MRX
- Source
- NOAA / NWS
Daily Outlook
This Week in Sullivan County
Wednesday looks like the warmest upcoming period in Sullivan County at 83 degrees F.
Monday Night is the coolest period ahead with temperatures near 57 degrees F.
The strongest winds are forecast for Monday at about 0 to 5 mph W.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 24, 2026 6:20 AM EDT
- Coverage
- 7 days
- Time zone
- America/New_York
- Forecast office
- MRX
- Radar station
- KMRX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Sunny, with a high near 78. West wind 0 to 5 mph.
Mostly clear, with a low around 57. Northeast wind 0 to 5 mph.
Sunny, with a high near 80. North wind 0 to 5 mph.
Mostly clear, with a low around 62. East wind 0 to 5 mph.
A slight chance of rain showers between 2pm and 5pm, then a slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. South wind around 5 mph. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Mostly cloudy, with a low around 66. South wind 0 to 5 mph. Chance of precipitation is 30%.
A chance of showers and thunderstorms after 8am. Partly sunny, with a high near 81. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 66. Chance of precipitation is 50%.
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 81. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 65. Chance of precipitation is 20%.
Mostly sunny, with a high near 83.
Mostly clear, with a low around 66.
A slight chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 83.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Overnight
Aug 24
|
Mostly Clear
|
59°F |
0 mph
|
|
Monday
Aug 24
|
Sunny
|
78°F |
0 to 5 mph
W
|
|
Monday Night
Aug 24
|
Mostly Clear
|
57°F |
0 to 5 mph
NE
|
|
Tuesday
Aug 25
|
Sunny
|
80°F |
0 to 5 mph
N
|
|
Tuesday Night
Aug 25
|
Mostly Clear
|
62°F |
0 to 5 mph
E
|
|
Wednesday
Aug 26
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
83°F |
5 mph
S
|
|
Wednesday Night
Aug 26
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
66°F |
0 to 5 mph
S
|
|
Thursday
Aug 27
|
Chance Showers And Thunderstorms
|
81°F |
0 to 5 mph
SW
|
|
Thursday Night
Aug 27
|
Chance Showers And Thunderstorms
|
66°F |
0 to 5 mph
SE
|
|
Friday
Aug 28
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
81°F |
0 to 5 mph
W
|
|
Friday Night
Aug 28
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
65°F |
0 to 5 mph
N
|
|
Saturday
Aug 29
|
Mostly Sunny
|
83°F |
0 to 5 mph
NE
|
|
Saturday Night
Aug 29
|
Mostly Clear
|
66°F |
0 mph
|
|
Sunday
Aug 30
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
83°F |
0 to 5 mph
SW
|
Major City Forecasts
Live forecast snapshots for major cities across Sullivan County.
Coverage
Forecast coverage currently spans 4 of 4 mapped cities in Sullivan County.
Largest mapped city population in this region: 54,112.
