Belfast weather forecast: Light showers and moderate breeze expected September 17

Belfast, September 17, 2026 – Residents of Belfast can expect a day of mixed weather, with a chance of light showers and a moderate breeze. The day will begin with cooler temperatures, gradually warming up as the afternoon progresses.The city is set to experience a day where umbrellas might be a useful accessory, though not necessarily a constant requirement. The overall conditions suggest a need for preparedness for intermittent dampness, but with periods of clearer skies also anticipated.Belfast Weather TodayToday, 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.Umbrellas and waterproof footwear advisedGiven the forecast of light showers and a significant chance of rain, it would be prudent for Belfast residents to carry an umbrella or wear waterproof outerwear. The moderate wind speeds also suggest that lighter clothing might be accompanied by a need for a windbreaker. While the temperatures are not extreme, the combination of coolness and potential dampness means dressing in layers would be the most sensible approach to ensure comfort throughout the day. Outdoor activities should be planned with the possibility of brief interruptions due to rain in mind.Belfast Weather for Upcoming 7 DaysLooking ahead, the weather in Belfast is expected to remain variable. Tomorrow, September 18, will see a slight increase in temperature, with a high of 17°C and a low of 13°C. The condition is described as light rain, indicating a wetter day than today. 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.The latter half of the week shows a warming trend. 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.DateMax Temp (C)Min Temp (C)Avg Temp (C)Condition2026-09-17161113.5Light showers2026-09-18171315.0Light rain2026-09-19171114.0Sunny intervals2026-09-20171516.0Cloudy2026-09-21211417.5Overcast2026-09-22171214.5Light rain2026-09-23161214.0Sunny intervalsThe 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.Source: Data referenced in this article is taken from the latest World News and Live updates. Download the TOI app.