Latest weather updates and forecast for Belfast.
Belfast, September 17, 2026 – Residents of Belfast can expect a day of mixed weather, with a chance of light showers and a moderate breeze. Today, September 17, 2026, Belfast will see a maximum temperature of 16°C, with the mercury dipping to a low of 11°C. The average temperature for the day is expected to be around 13.5°C. There is a 20% chance of rain, and the conditions are described as light showers. Humidity levels are predicted to be relatively high, at 86%. The wind will be a notable factor, with a maximum speed of 56.33 kph, suggesting a brisk and potentially blustery day. The sunrise is scheduled for 07:00 and sunset for 19:35, providing a good amount of daylight.
The day will begin with cooler temperatures, gradually warming up as the afternoon progresses.
Tomorrow, September 18, will see a slight increase in temperature, with a high of 17°C and a low of 13°C. September 19 is forecast to be similar in temperature, with a high of 17°C and a low of 11°C, but with sunny intervals, suggesting a break from the rain. September 20 will be cloudy with a high of 17°C and a low of 15°C. A more significant jump in temperature is expected on September 21, with a high of 21°C and a low of 14°C, under overcast skies. The week concludes with a return to cooler conditions and rain; September 22 is predicted to have a high of 17°C and a low of 12°C with light rain, followed by sunny intervals on September 23 with a high of 16°C and a low of 12°C.
Looking ahead, the weather in Belfast is expected to remain variable. The latter half of the week shows a warming trend. The week ahead in Belfast promises a dynamic weather pattern, with a mix of showers, sunshine, and increasing temperatures towards the middle of the week before cooling down again.
The condition is described as light rain, indicating a wetter day than today.
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