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Johnston SC Weather - Clear - 77°F
Clear
77°F
Updated 12:23 am
Feels Like 76°F
Humidity 73%
Wind SE 6 mph
Barometer  30.26 in
Dew Point 68°F
Johnston SC Weather - Clear - 25°C
Clear
25°C
Updated 12:23 am
Feels Like 25°C
Humidity 73%
Wind SE 10 km/h
Barometer  102.4 kPa
Dew Point 20°C
Johnston, SC Weather and Current Conditionsjohnston sc weather forecast

Johnston, SC Weather Forecast

Johnston South Carolina WeatherJohnston, South Carolina Weather Weather Forecast
Here is the API 14 day weather forecast for Johnston, South Carolina. Note: The 7-day weather forecast for Johnston, SC is the most reliable and accurate weather forecast. This template should only be used as a probable scenario. Forecasting weather beyond the next 7 days is a challenge.
Johnston, SC Weather Forecast Dated: 1223 AM Wed Sep 09 2026
Expect a very warm period with a mix of sun and clouds and frequent chances of rain over the coming period. generally humid conditions and no major pressure swings will dominate. Isolated storms at times.

Wednesday, September 9, 2026

Mid-Morning
Johnston Weather - 2026-09-09 - Morning - Cloudy
73°F 23°C
Cloudy
Mid-Afternoon
Johnston Weather - 2026-09-09 - Afternoon - Partly Cloudy
88°F 31°C
Partly Cloudy
Early-Evening
Johnston Weather - 2026-09-09 - Evening - Partly Cloudy
84°F 29°C
Partly Cloudy
Warm and summery near 88°F 31°C, overcast in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and barometric pressure falling. Winds turning from the NE to the SSE at 4 mph 7 km/h.

Thursday, September 10, 2026

Mid-Morning
Johnston Weather - 2026-09-10 - Morning - Overcast
75°F 24°C
Overcast
Mid-Afternoon
Johnston Weather - 2026-09-10 - Afternoon - Overcast
90°F 32°C
Overcast
Early-Evening
Johnston Weather - 2026-09-10 - Evening - Overcast
87°F 31°C
Overcast
Hot and sweltering around 90°F 32°C, overcast throughout the day, with lower humidity and barometric pressure falling.

Friday, September 11, 2026

Mid-Morning
Johnston Weather - 2026-09-11 - Morning - Sunny
80°F 27°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-11 - Afternoon - Overcast
92°F 33°C
Overcast
Early-Evening
Johnston Weather - 2026-09-11 - Evening - Partly Cloudy
87°F 30°C
Partly Cloudy
Sizzling hot with 92°F 33°C, sunny in the morning, overcast in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.

Saturday, September 12, 2026

Mid-Morning
Johnston Weather - 2026-09-12 - Morning - Sunny
76°F 25°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-12 - Afternoon - Light Showers
84°F 29°C
Light Showers
Early-Evening
Johnston Weather - 2026-09-12 - Evening - Scattered Showers
83°F 29°C
Scattered Showers
Warm and summery around 84°F 29°C (feels like 89°F 32°C), periods of heavy rain and gusty conditions, with lower humidity and steady pressure. A stray shower or storm late in the day.

Sunday, September 13, 2026

Mid-Morning
Johnston Weather - 2026-09-13 - Morning - Partly Cloudy
75°F 24°C
Partly Cloudy
Mid-Afternoon
Johnston Weather - 2026-09-13 - Afternoon - Overcast
89°F 32°C
Overcast
Early-Evening
Johnston Weather - 2026-09-13 - Evening - Overcast
86°F 30°C
Overcast
Quite warm reaching 89°F 32°C, feeling like 96°F 35°C during peak afternoon, cloudy in the morning, partly cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure.

Monday, September 14, 2026

Mid-Morning
Johnston Weather - 2026-09-14 - Morning - Sunny
80°F 27°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-14 - Afternoon - Partly Cloudy
92°F 33°C
Partly Cloudy
Early-Evening
Johnston Weather - 2026-09-14 - Evening - Partly Cloudy
88°F 31°C
Partly Cloudy
Very hot with a high of 92°F 33°C, feeling closer to 97°F 36°C in the humidity, sunny in the morning, cloudy in the afternoon, and partly cloudy this evening, with lower humidity and steady pressure.

Tuesday, September 15, 2026

Mid-Morning
Johnston Weather - 2026-09-15 - Morning - Overcast
81°F 27°C
Overcast
Mid-Afternoon
Johnston Weather - 2026-09-15 - Afternoon - Sunny
94°F 34°C
Sunny
Early-Evening
Johnston Weather - 2026-09-15 - Evening - Sunny
90°F 32°C
Sunny
Sizzling hot near 94°F 34°C with a heat index reaching 98°F 37°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure.

Wednesday, September 16, 2026

Mid-Morning
Johnston Weather - 2026-09-16 - Morning - Overcast
81°F 27°C
Overcast
Mid-Afternoon
Johnston Weather - 2026-09-16 - Afternoon - Nearby Thunderstorms
91°F 33°C
Nearby Thunderstorms
Early-Evening
Johnston Weather - 2026-09-16 - Evening - Scattered Showers
82°F 28°C
Scattered Showers
Hot and sweltering around 91°F 33°C (heat index 97°F 36°C), locally heavy thunderstorms at times, with steady humidity and steady pressure. Winds building from SSW at 2 mph 4 km/h to SE at 11 mph 18 km/h.

Thursday, September 17, 2026

Mid-Morning
Johnston Weather - 2026-09-17 - Morning - Sunny
77°F 25°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-17 - Afternoon - Overcast
88°F 31°C
Overcast
Early-Evening
Johnston Weather - 2026-09-17 - Evening - Overcast
86°F 30°C
Overcast
Very warm near 88°F 31°C, though humidity makes it feel like 94°F 34°C, sunny in the morning, partly cloudy in the afternoon, and overcast this evening, with lower humidity and steady pressure.

Friday, September 18, 2026

Mid-Morning
Johnston Weather - 2026-09-18 - Morning - Sunny
77°F 25°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-18 - Afternoon - Cloudy
83°F 29°C
Cloudy
Early-Evening
Johnston Weather - 2026-09-18 - Evening - Sunny
73°F 23°C
Sunny
Warm and summery around 83°F 29°C (feels like 87°F 31°C), sunny in the morning, becoming partly cloudy through the afternoon and evening, with steady humidity and steady pressure.

Saturday, September 19, 2026

Mid-Morning
Johnston Weather - 2026-09-19 - Morning - Sunny
71°F 22°C
Sunny
Mid-Afternoon
Johnston Weather - 2026-09-19 - Afternoon - Sunny
85°F 29°C
Sunny
Early-Evening
Johnston Weather - 2026-09-19 - Evening - Sunny
83°F 28°C
Sunny
Warm and summery near 85°F 29°C, partly cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and barometric pressure falling. Winds moving from the WNW to the SSW at 7 mph 11 km/h.

Sunday, September 20, 2026

Mid-Morning
Johnston Weather - 2026-09-20 - Morning - Cloudy
74°F 23°C
Cloudy
Mid-Afternoon
Johnston Weather - 2026-09-20 - Afternoon - Light Showers
81°F 27°C
Light Showers
Early-Evening
Johnston Weather - 2026-09-20 - Evening - Heavy Rain
73°F 23°C
Heavy Rain
Very warm near 81°F 27°C, though humidity makes it feel like 84°F 29°C, dry early, with showers continuing through afternoon and evening, with steady humidity and steady pressure. Winds swinging from the WSW to the ENE at 12 mph 20 km/h. Gusts up to 21 mph 34 km/h.

Monday, September 21, 2026

Mid-Morning
Johnston Weather - 2026-09-21 - Morning - Light Showers
56°F 13°C
Light Showers
Mid-Afternoon
Johnston Weather - 2026-09-21 - Afternoon - Light Showers
55°F 13°C
Light Showers
Early-Evening
Johnston Weather - 2026-09-21 - Evening - Overcast
56°F 13°C
Overcast
Brisk around 55°F 13°C, intermittent showers through midday, easing by evening, with steady humidity and steady pressure. Winds shifting from the NE to the NNE at 10 mph 15 km/h. Gusts up to 21 mph 33 km/h.

Tuesday, September 22, 2026

Mid-Morning
Johnston Weather - 2026-09-22 - Morning - Overcast
57°F 14°C
Overcast
Mid-Afternoon
Johnston Weather - 2026-09-22 - Afternoon - Light Showers
64°F 18°C
Light Showers
Early-Evening
Johnston Weather - 2026-09-22 - Evening - Light Showers
31°F 9°C
Light Showers
Mildly cool near 64°F 18°C, clouds and showers taking over for the afternoon and evening, with lower humidity and barometric pressure falling. Winds turning from the NNE to the at 4 mph 7 km/h.

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Weather by the Numbers

Wed, 9th
Johnston SC Weather - Wednesday, Sep 9, 2026 - Overcast
Hi: 88°F 31°C
Lo: 70°F 21°C
Sunrise 07:07 AM
Sunset 07:42 PM
Wind E 8 mph13 km/h
Dew Point 60°F15°C
uv Index 7
Barometric Pressure 30.27 in1025 mb
POP 10% *
Humidity 44%
Thu, 10th
Johnston SC Weather - Thursday, Sep 10, 2026 - Cloudy
Hi: 90°F 32°C
Lo: 72°F 22°C
Sunrise 07:07 AM
Sunset 07:41 PM
Wind SSW 3 mph5 km/h
Dew Point 65°F18°C
uv Index 7
Barometric Pressure 30.06 in1018 mb
POP 8% *
Humidity 48%
Fri, 11th
Johnston SC Weather - Friday, Sep 11, 2026 - Sunny
Hi: 93°F 34°C
Lo: 76°F 24°C
Sunrise 07:08 AM
Sunset 07:40 PM
Wind WSW 4 mph6 km/h
Dew Point 66°F19°C
uv Index 6
Barometric Pressure 29.94 in1014 mb
POP 1% *
Humidity 45%
Sat, 12th
Johnston SC Weather - Saturday, Sep 12, 2026 - Light Rain Shower
Hi: 89°F 32°C
Lo: 72°F 22°C
Sunrise 07:09 AM
Sunset 07:38 PM
Wind S 5 mph8 km/h
Dew Point 69°F20°C
uv Index 7
Barometric Pressure 30.03 in1017 mb
POP 27% *
Humidity 55%
Sun, 13th
Johnston SC Weather - Sunday, Sep 13, 2026 - Sunny
Hi: 90°F 32°C
Lo: 73°F 23°C
Sunrise 07:09 AM
Sunset 07:37 PM
Wind WSW 6 mph9 km/h
Dew Point 71°F22°C
uv Index 7
Barometric Pressure 30.09 in1019 mb
POP 5% *
Humidity 63%
Mon, 14th
Johnston SC Weather - Monday, Sep 14, 2026 - Cloudy
Hi: 93°F 34°C
Lo: 77°F 25°C
Sunrise 07:10 AM
Sunset 07:35 PM
Wind WSW 5 mph8 km/h
Dew Point 69°F21°C
uv Index 7
Barometric Pressure 30.09 in1019 mb
POP 4% *
Humidity 55%
Tue, 15th
Johnston SC Weather - Tuesday, Sep 15, 2026 - Sunny
Hi: 94°F 34°C
Lo: 78°F 26°C
Sunrise 07:11 AM
Sunset 07:34 PM
Wind WNW 4 mph6 km/h
Dew Point 68°F20°C
uv Index 8
Barometric Pressure 30.12 in1020 mb
POP 7% *
Humidity 51%
Wed, 16th
Johnston SC Weather - Wednesday, Sep 16, 2026 - Patchy Rain Nearby
Hi: 92°F 33°C
Lo: 76°F 24°C
Sunrise 07:12 AM
Sunset 07:33 PM
Wind SE 4 mph7 km/h
Dew Point 70°F21°C
uv Index 7
Barometric Pressure 30.15 in1021 mb
POP 11% *
Humidity 55%
Thu, 17th
Johnston SC Weather - Thursday, Sep 17, 2026 - Sunny
Hi: 88°F 31°C
Lo: 75°F 24°C
Sunrise 07:12 AM
Sunset 07:31 PM
Wind ESE 4 mph7 km/h
Dew Point 69°F21°C
uv Index 7
Barometric Pressure 30.21 in1023 mb
POP 3% *
Humidity 61%
Fri, 18th
Johnston SC Weather - Friday, Sep 18, 2026 - Sunny
Hi: 88°F 31°C
Lo: 69°F 21°C
Sunrise 07:13 AM
Sunset 07:30 PM
Wind ESE 5 mph8 km/h
Dew Point 68°F20°C
uv Index 7
Barometric Pressure 30.24 in1024 mb
POP 3% *
Humidity 60%
Sat, 19th
Johnston SC Weather - Saturday, Sep 19, 2026 - Sunny
Hi: 86°F 30°C
Lo: 68°F 20°C
Sunrise 07:14 AM
Sunset 07:28 PM
Wind W 7 mph11 km/h
Dew Point 65°F18°C
uv Index 7
Barometric Pressure 30.15 in1021 mb
POP 4% *
Humidity 64%
Sun, 20th
Johnston SC Weather - Sunday, Sep 20, 2026 - Light Rain Shower
Hi: 82°F 28°C
Lo: 65°F 19°C
Sunrise 07:14 AM
Sunset 07:27 PM
Wind ENE 11 mph17 km/h
Dew Point 67°F20°C
uv Index 6
Barometric Pressure 30.06 in1018 mb
POP 22% *
Humidity 66%
Mon, 21st
Johnston SC Weather - Monday, Sep 21, 2026 - Light Rain Shower
Hi: 63°F 17°C
Lo: 55°F 13°C
Sunrise 07:15 AM
Sunset 07:26 PM
Wind NNE 11 mph17 km/h
Dew Point 55°F13°C
uv Index 3
Barometric Pressure 30.15 in1021 mb
POP 73% *
Humidity 97%
Tue, 22nd
Johnston SC Weather - Tuesday, Sep 22, 2026 - Overcast
Hi: 64°F 18°C
Lo: 56°F 13°C
Sunrise 07:16 AM
Sunset 07:24 PM
Wind NNE 8 mph13 km/h
Dew Point 58°F14°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 30% *
Humidity 91%
* POP = Probability of Precipitation. Data for 12:00 PM.