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Hyannis Weather Forecast
| TONIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY |
 |  |  |  |  |  | |  | | | |  |
| Mostly Cloudy | Windy | Chance of T-Storm | Chance of Showers | Partly Cloudy | Mostly Sunny | Chance of T-Storm | Mostly Cloudy | Chance of T-Storm | Chance of Showers | Chance of T-Storm | Chance of Showers |
| Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 51°FLo: 11°C | Hi: 69°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 75°FHi: 24°C | Lo: 51°FLo: 11°C | Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 71°FHi: 22°C |
| POP: 70% | POP: 20% | POP: 40% | POP: 50% | POP: 20% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1257 PM MDT Sat Sep 12 2026 
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Issued: 1240 AM CDT Sun Sep 13 2026
Key Messages
- A threat for thunderstorms persist both tonight and again Sunday night across the area. The strongest storms may pose a threat for hail.
- Cloudy and cooler conditions are expected across much of the area Sunday, with highs expected to remain in the upper 60s east of HWY 83.
- A cold front will cross the area Monday into Monday night, bringing chances for showers and thunderstorms ahead of the front, followed by a sharp cool-down for Tuesday.
Aviation
/06Z TAFS THROUGH 06Z MONDAY/... Issue...