Johnston, SC Weather Forecast
Local 7-day forecast
Showers And Thunderstorms Likely
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston, SC in one place.
Showers and thunderstorms likely. Mostly cloudy, with a high near 89. Heat index values as high as 100. North wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Local Weather Overview
This forecast page for Johnston, SC 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: Jul 23, 2026 11:38 AM EDT.
The active forecast window currently covers Jul 24 to Jul 29, 2026 for Johnston, SC.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 24 to Jul 29, 2026
- Latest sync
- Jul 23, 2026 11:38 AM EDT
- Forecast office
- CAE
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston
Tuesday looks like the warmest upcoming period in Johnston at 96 degrees F.
Saturday Night is the coolest period ahead with temperatures near 71 degrees F.
The strongest winds are forecast for Tuesday at about 5 to 8 mph SW.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 23, 2026 11:38 AM EDT
- Coverage
- 6 days
- Time zone
- America/New_York
- Forecast office
- CAE
- Radar station
- KCAE
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms. Mostly cloudy, with a low around 72. Northeast wind around 3 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
A chance of rain showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and thunderstorms likely. Mostly cloudy, with a high near 88. Northwest wind 1 to 6 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
Showers and thunderstorms likely before 11pm, then a chance of showers and thunderstorms between 11pm and 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
A chance of showers and thunderstorms after 8am. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 2am. Partly cloudy, with a low around 72. Chance of precipitation is 30%.
Sunny, with a high near 93.
Mostly clear, with a low around 73.
Sunny, with a high near 96.
Mostly clear, with a low around 75.
A slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 96.
A slight chance of showers and thunderstorms before 8pm, then a chance of showers and thunderstorms between 8pm and 2am. Partly cloudy, with a low around 73.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Jul 24
|
Showers And Thunderstorms Likely
|
89°F |
5 mph
N
|
|
Friday Night
Jul 24
|
Showers And Thunderstorms
|
72°F |
3 mph
NE
|
|
Saturday
Jul 25
|
Chance Showers And Thunderstorms
|
88°F |
1 to 6 mph
NW
|
|
Saturday Night
Jul 25
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
71°F |
3 mph
W
|
|
Sunday
Jul 26
|
Chance Showers And Thunderstorms
|
90°F |
5 mph
NW
|
|
Sunday Night
Jul 26
|
Chance Showers And Thunderstorms
|
72°F |
2 mph
SW
|
|
Monday
Jul 27
|
Sunny
|
93°F |
3 mph
N
|
|
Monday Night
Jul 27
|
Mostly Clear
|
73°F |
1 to 5 mph
S
|
|
Tuesday
Jul 28
|
Sunny
|
96°F |
5 to 8 mph
SW
|
|
Tuesday Night
Jul 28
|
Mostly Clear
|
75°F |
7 mph
SW
|
|
Wednesday
Jul 29
|
Sunny then Slight Chance Showers And Thunderstorms
|
96°F |
7 mph
W
|
|
Wednesday Night
Jul 29
|
Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms
|
73°F |
6 mph
NW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston.