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Lake St. Joseph, LA Weather Forecast
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Lake St. Joseph Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SUNDAY | MONDAY |
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| Mostly Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Sunny | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 100°FHi: 38°C | Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Lo: 79°FLo: 26°C | Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C | Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 321 AM CDT Tue Aug 18 2026 
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Lake St. Joseph Forecast Discussion
Issued: 323 AM CDT Tue Aug 18 2026
Key Messages
- Dangerous heat stress conditions are expected through at least the middle of this week.
- Chances for afternoon storms will increase, and the risk for dangerous heat will decrease late this week into the weekend.
Discussion
... Issued at 320 AM CDT Tue Aug 18 2026
Through tonight: Heat and humidity will remain the main concern in the short term. With the exception of our northeast, another day of near record high temperatures is expected today. A large 596dam...