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Johnsonville Weather Forecast
| TODAY | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
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| Mostly Sunny | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Showers |
| Hi: 91°FHi: 33°C | Hi: 91°FHi: 33°C | Lo: 70°FLo: 21°C | Hi: 90°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 89°FHi: 32°C | Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C Lo: 69°FLo: 21°C | Hi: 85°FHi: 29°C Lo: 69°FLo: 21°C | Hi: 81°FHi: 27°C |
| POP: 40% | POP: 70% | POP: 50% | POP: 40% | POP: 40% | POP: 30% | POP: 50% | POP: 60% | POP: 60% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 558 AM EDT Fri Sep 18 2026 
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Issued: 558 AM EDT Fri Sep 18 2026
Key Messages
1)Heat index values near 100 today.
2) A cold front brings an unsettled Tuesday followed by more seasonable temperatures.
Discussion
... KEY MESSAGE 1...Heat index values near 100 today.
KEY MESSAGE 1 DESCRIPTION...Although the core of the large mid level ridge will be west of the area low level thermal trough and 850mb temps just shy of 20C will foster highs in the mid 90s away from the coast. Granted, this oceanic influence will be very localized by a very pinned seabreeze. Dewpoints i...