- Clothing
- Waterproof jacket and umbrella strongly recommended.
Tomorrow's Weather Forecast - Belfast
Tomorrow's weather in Belfast. high 19°C (66°F), low 13°C (55°F). Rainy.
Tomorrow’s Outlook
Tomorrow brings a similar temperature to today. Expect heavy rain in the morning and afternoon and night, with rain chances climbing as high as 100%. That risk lines up with humidity averaging 80% through the day the more moisture in the air, the more readily clouds build into showers. Humidity holds around 80%, giving the air a damp, heavy feel even without much heat behind it. A light breeze near 23 km/h is expected. Sunrise is at 6:50 AM and sunset at 7:47 PM, for about 12h 57m of daylight.
- Tomorrow
- 19°/ 13°
- Today18° / 14°
Tomorrow’s Hourly Weather Outlook
Morning6 AM – Noon17°
- Rain probability
- 100%
- Wind speed
- 19 km/h
AfternoonNoon – 6 PM18°
- Rain probability
- 65%
- Wind speed
- 23 km/h
Evening6 PM – Midn16°
- Rain probability
- 30%
- Wind speed
- 9 km/h
NightMidn – 6 AM15°
- Rain probability
- 95%
- Wind speed
- 19 km/h
24-Hour Rain & Temperature Forecast
Tomorrow12 Sep
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Planning Advice for Tomorrow
- Outdoor
- Not ideal for outdoor plans or car washes — heavy rain expected.
- Travel
- Expect traffic slowdowns from wet roads. Allow extra time.
Sunrise & Sunset
Sunrise
Dawn 6:20 AMTotal Daylight
Full day forecastSolar noon 1:19 PM
Sunset
Dusk 8:17 PMvs today-4 min daylight
Sunrise shift2 min later
Sunset shift3 min earlier
5-Day Weather Forecast
Full 15-Day ForecastWeather Insight
Belfast is forecast to reach a high of 19°C tomorrow, with an overnight low around 13°C. That's 4° above the long-term average high of 15°C for this time of year. It continues a recent pattern — 12 of the last 19 days with published data have run warmer than normal. Expect a high chance of rain (100% probability) and moderate breezes averaging 23 km/h. Air quality is currently Moderate (AQI 52), driven mainly by PM2.5 at 9.6 μg/m³.
Today vs Normal
18°C+2° above normal
The long-term average high for today is 16°C.
12 of the last 19 days with published data ran above normal.
It continues that pattern - today's forecast is also running above normal.
Red = above normal, blue = at or below · last 12 days
Air Quality
Air Quality
Moderate
Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.