Latest weather updates and forecast for Belfast.
Belfast residents can expect a day of overcast skies and a high chance of rain as the city experiences a cool and humid Monday. The weather is set to be dominated by cloud cover, with temperatures hovering around the seasonal average.
Source: Data referenced in this article is taken from https://www.metoffice.gov.uk
Today, September 21, 2026, Belfast will see overcast conditions throughout the day. The maximum temperature is forecast to reach 21°C, while the minimum temperature will be around 14°C, resulting in a comfortable average temperature of 17.5°C. Humidity levels are expected to be high, reaching 93%, which may make the air feel damp. There is a 20% chance of rain, though significant precipitation is not anticipated. Winds will be moderate, with a maximum speed of 30.58 kph. Tomorrow, September 22, the temperature will drop slightly with a high of 18°C and a low of 12°C, accompanied by light rain. The latter half of the week shows a gradual cooling trend, with sunny intervals expected on September 23 and again on September 26. Mid-week, from September 24 to September 25, will be predominantly cloudy with temperatures ranging between 11°C and 18°C. The week concludes with light showers on September 27, maintaining cooler temperatures.
the overcast conditions and damp air suggest a day where staying dry will be a priority for outdoor activities While heavy rainfall is not expected. The moderate wind speeds should not cause significant disruption, but the overall feeling will be one of a cool, damp day. Overall, the week ahead suggests a period of unsettled weather with fluctuating temperatures and intermittent rain.
Given the high humidity and the possibility of light showers, it would be prudent for Belfast residents to carry an umbrella or wear waterproof footwear today. The upcoming week in Belfast will see a mix of weather conditions, starting with overcast skies and a chance of rain today.