Tomorrow's Weather Forecast - Belfast

Tomorrow's weather in Belfast. high 21°C (70°F), low 14°C (57°F). Rainy.

Tomorrow’s Outlook

Tomorrow will be 2°C warmer than 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 79% through the day the more moisture in the air, the more readily clouds build into showers. Humidity holds around 79%, giving the air a damp, heavy feel even without much heat behind it. A light breeze near 21 km/h is expected. Sunrise is at 6:50 AM and sunset at 7:47 PM, for about 12h 57m of daylight.

Tomorrow
21°/ 14°
Today19° / 14°

Tomorrow’s Hourly Weather Outlook

Morning6 AM – Noon18°
Rain probability
100%
Wind speed
20 km/h
AfternoonNoon – 6 PM20°
Rain probability
65%
Wind speed
21 km/h
Evening6 PM – Midn16°
Rain probability
30%
Wind speed
16 km/h
NightMidn – 6 AM15°
Rain probability
95%
Wind speed
19 km/h

24-Hour Rain & Temperature Forecast

Tomorrow12 Sep
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Temperature · peaks at +21°C

Planning Advice for Tomorrow

Clothing
Waterproof jacket and umbrella strongly recommended.
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 AM
Total Daylight
Full day forecastSolar noon 1:19 PM
Sunset
Dusk 8:17 PM
vs today-4 min daylight
Sunrise shift2 min later
Sunset shift3 min earlier

5-Day Weather Forecast

Full 15-Day Forecast
Today11 Sep
Drizzle
19°/ 14°
4%
Rain
6–17
Wind
Tomorrow12 Sep
Rainy
21°/ 14°
100%
Rain
2–21
Wind
Sun13 Sep
Overcast
19°/ 14°
8%
Rain
3–13
Wind
Mon14 Sep
Drizzle
20°/ 15°
83%
Rain
6–22
Wind
Tue15 Sep
Drizzle
17°/ 12°
62%
Rain
18–25
Wind

Weather Insight

Belfast is forecast to reach a high of 21°C tomorrow, with an overnight low around 14°C. That's 6° above the long-term average high of 15°C for this time of year. Expect a high chance of rain (100% probability) and moderate breezes averaging 21 km/h. Air quality is currently Moderate (AQI 52), driven mainly by PM2.5 at 9.6 μg/m³.

Today vs Normal

19°C+3° above normal

The long-term average high for today is 16°C.

Air Quality

Air Quality
Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.