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Belfast Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  | |  | | | |  |  | |
| Mostly Cloudy | Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Partly Sunny | Mostly Cloudy | Partly Sunny | Mostly Cloudy | Mostly Sunny | Partly Cloudy | Partly Sunny |
| Lo: 45°FLo: 7°C | Hi: 59°FHi: 15°C | Lo: 45°FLo: 7°C | Lo: 45°FLo: 7°C | Hi: 59°FHi: 15°C | Lo: 41°FLo: 5°C | Hi: 59°FHi: 15°C | Lo: 41°FLo: 5°C | Hi: 61°FHi: 16°C | Lo: 41°FLo: 5°C | Hi: 65°FHi: 18°C | |
| POP: 50% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 634 PM EDT Sun Sep 20 2026 
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Issued: 746 PM EDT Sun Sep 20 2026
Key Messages
1) Below normal temperatures will continue through most of the upcoming week, with a few showers possible at times mid-week.
Discussion
... KEY MESSAGE 1...Below normal temperatures will continue through most of the upcoming week, with a few showers possible at times mid-week.
Surface high pressure over Ontario will build into the eastern Great Lakes region today. Waves of low pressure will move along a surface trough from the Ohio Valley to the Mid-Atlantic region through tonight. Drie...