Weather in Belfast in September 2024
Average weather
Average temperature in Belfast in September
The expected average maximum temperature in September is +63°F with a maximum of +68°F and a minimum of +46°F.
The average maximum temperature goes down 25% by the end of the month, compared with the beginning of the month, from +68°F to +63°F.
Is Belfast warm or cold in September?
Belfast is typically mild in September.
Maximum temperatures go down compared to the previous month from +64°F to +61°F. The minimum temperature also goes down from +54°F to +50°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Belfast:
Climate in Belfast in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +64°F | +61°F | +55°F | ||||
| Min. temperature | ||||||
| +37°F | +34°F | +28°F | ||||
| Max. temperature | ||||||
| +84°F | +75°F | +70°F | ||||
| Rainfall | ||||||
| 82 mm | 70 mm | 91 mm | ||||
| Wind | ||||||
| 3 m/s | 3 m/s | 4 m/s | ||||
| Humidity | ||||||
| 80% | 81% | 83% | ||||
| Air pressure | ||||||
| 1012 HPa | 1012 HPa | 1009 HPa | ||||
| Sunny days | ||||||
| 2 | 2 | 2 | ||||
| Cloudy days | ||||||
| 20 | 19 | 19 | ||||
| Rainy days | ||||||
| 9 | 9 | 10 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. It’s getting colder in September. From +64°F in the day, the average maximum temperature lowers to +61°F. As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 82 mm to 70 mm. Humidity rises from 80% to 81%. The average wind speed doesn’t change much during September, staying around 3 m/s. The amount of sunny days stay about the same, averaging 2 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 4 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Belfast is gradually increasing during September, going from 2 m/s to 7 m/s over the course of the month.
Rain
How was the weather last September in Belfast?
Climate Change Over the Years
The climate in Belfast in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1992 (+60°F) and the highest in 1996 (+66°F). The driest year was 1986 with only 5 mm of rainfall, and the wettest year was 1999 with 144 mm.
FAQ
Is September a good time to visit Belfast?
Can you sunbathe in Belfast in September?
Is Belfast rainy in September?
Is it sunny in Belfast in September?
Other cities in United Kingdom
Monthly weather in Belfast
Source of the data
For this page, we’ve looked at the typical weather in Belfast, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.