City of Belfast (Belfast)
September
Weather in City of Belfast for September 2026
Your guide to City of Belfast weather in September - trends and predictions
Until now, September 2026 in City of Belfast has been nearly identical to the historical average, with a temperature of 16.7 °C (showing only a slight deviation of 0.1 °C).
The forecast for the next days in City of Belfast predicts temperatures to be around 18 °C, close to the historical average.
In general, the average temperature in City of Belfast at the beginning of September is 18 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 18.4 °C by the end of September.
City of Belfast experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 109.1 mm.
New! Chat with our AI weatherman - it’s amazing and free.
Temperatures
Rain 🌧️
More
8
Dry days
22
Rainy days
0
Snow days
15°/8°
Temperatures
23 km/h
Avg max wind
84 %
Avg humidity
City of Belfast Weather September
Move between months or click on a day
Temperatures trend during September in City of Belfast
See the weather trend as well as the moving average line
September weather in City of Belfast day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 17° /10° | 2.8 mm | 3 | |
| 2 Sept. | Light rain shower | 18° /10° | 3.1 mm | 3 | |
| 3 Sept. | Light rain shower | 17° /10° | 4.9 mm | 4 | |
| 4 Sept. | Patchy rain possible | 17° /9° | 1.6 mm | 4 | |
| 5 Sept. |  Overcast | 18° /9° | 0 mm | 4 | |
| 6 Sept. |  Partly cloudy | 20° /11° | 0.3 mm | 4 | |
| 7 Sept. | Patchy rain possible | 19° /11° | 2.4 mm | 4 | |
| 8 Sept. | Partly cloudy | 18° /9° | 0.7 mm | 4 | |
| 9 Sept. | Overcast | 17° /9° | 0.6 mm | 4 | |
| 10 Sept. |  Moderate or heavy rain shower | 17° /10° | 7.3 mm | 3 | |
| 11 Sept. | Light rain shower | 15° /8° | 2.6 mm | 3 | |
| 12 Sept. | Light rain shower | 15° /7° | 3.9 mm | 3 | |
| 13 Sept. | Overcast | 15° /6° | 1.2 mm | 3 | |
| 14 Sept. | Overcast | 17° /9° | 3.4 mm | 3 | |
| 15 Sept. |  Moderate rain | 14° /9° | 7.8 mm | 3 | |
| 16 Sept. |  Cloudy | 16° /8° | 0.4 mm | 3 | |
| 17 Sept. |  Light rain | 16° /9° | 8.5 mm | 3 | |
| 18 Sept. | Patchy rain possible | 16° /9° | 4.3 mm | 3 | |
| 19 Sept. | Light rain | 16° /9° | 3.9 mm | 3 | |
| 20 Sept. |  Sunny | 15° /8° | 0 mm | 2.8 | |
| 21 Sept. | Sunny | 22° /12° | 0.7 mm | 3.1 | |
| 22 Sept. | Overcast | 18° /12° | 0.3 mm | 2.1 | |
| 23 Sept. | Patchy rain possible | 14° /8° | 10.9 mm | 2.4 | |
| 24 Sept. | Overcast | 16° /8° | 0 mm | 4 | |
| 25 Sept. | Partly cloudy | 18° /12° | 0 mm | 5 | |
| 26 Sept. |  Fog | 17° /9° | 0.1 mm | 5 | |
| 27 Sept. | Overcast | 16° /8° | 0 mm | 4 | |
| 28 Sept. | Sunny | 21° /10° | 0 mm | 6 | |
| 29 Sept. | Sunny | 19° /12° | 0 mm | 5 | |
| 30 Sept. | Sunny | 22° /12° | 0 mm | 6 | |
| Next | |||||
Important Notice
Our weather forecast for City of Belfast in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the City of Belfast forecast closer to your planned date for the most up-to-date weather information.
Change Month
City of Belfast in September - FAQ
What are the expected maximum and minimum temperatures in City of Belfast during September?
During September, expect a variety of temperatures with highs around 15° and lows near 8°, suitable for diverse activities and preferences.
How much rainfall should be expected in City of Belfast during September?
Significant rainfall exceeding 109.1 mm is expected in City of Belfast during September, occurring over more than 22 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in City of Belfast during September?
The average wind speed in City of Belfast during September is 23 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in City of Belfast
Explore the daily rainfall trends and prepare for City of Belfasts September weather 💧
Typically, City of Belfast has 22 rainy days in September with a total of 109.1 mm of rainfall.
UV exposure in City of Belfast during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
Top locations in City of Belfast
Select a location for an accurate weather forecast
More Locations Quick links
More City of Belfast weather pages
You are here
Where is City of Belfast?Get accurate weather forecasts for City of Belfast, located at latitude 54.597 and longitude -5.925. Stay updated with localized weather information tailored for City of Belfast.
Found a mistake?
We appreciate your attention to details. Tell us here.