Weather WorldCostas Lake, MS Weather Forecast
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Costas Lake Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | THURSDAY | FRIDAY | SATURDAY |
 |  | | | | | | | | |
| Clear | Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°C | Lo: 71°FLo: 22°C | Hi: 95°FHi: 35°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 | Hi: 99°FHi: 37°C Lo: 75°FLo: 24°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 641 PM CDT Sat Aug 29 2026 
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Issued: 1232 PM CDT Sat Aug 29 2026
Key Messages
- Dangerous heat stress may return across the forecast area early to late next week.
- Rain chances are expected along/south of I-20 as multiple disturbances affect the area through the period.
Discussion
... Issued at 1229 PM CDT Sat Aug 29 2026
Saturday Night and Sunday...An upper-lvl high over the Southwest & Texas continues to expand towards the Southeast. As the high progresses, heat indices are expected start increasing to 100 degrees by Sunday. A cut-off low pressure near Gulf states...