Belfast weather in September (Antrim County, United Kingdom)

How does the September weather in Belfast compare to other months? This guide provides the necessary weather information for your travel plans.

Temperatures

In September, Belfast typically experiences moderate temperatures and moderate rainfall. The month of September belongs to the summer season. During the day, temperatures usually reach up to 17°C. At night, they tend to fall to approximately 11°C.

Precipitation

Belfast in September usually receives moderate rainfall, averaging around 83 mm for the month. Looking at the last 30 years, the data shows about 17 days with rain.

Average sunshine

The month experiences a moderate amount of sunlight, with 109 hours hours. A nice balance between sunshine and clouds.

In case you lean more towards enjoying temperate temperatures and rain-free days July and August typically offer the most optimal weather. In contrast, January, February, March and December tend to have less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Belfast climate page with graphs.

 

Belfast, monthly averages in September

Min Temperature 11°C  

Max Temperature 17°C  

Water Temperature 13°C *  

Chance of Rain 58%  

Precipitation 83 mm  

Rainy days 17 days  

Humidity 91% *  

Windspeed 14 km/h *  

Sunshine 109 hours *  

Percentage Sunshine 28% *  

Data from: Belfast, Ireland (19 KM, 12 Miles).

Where to go in the United Kingdom in September

Find out more about the weather in the United Kingdom and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Belfast, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes. With a water temperature of around 13°C there is no need to bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

6/10

Cycling

6/10

Walking

6/10

Camping

8/10

Outdoor sports

9/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Belfast.

Our site offers climate and forecast data for every country in the world. Are you going to the United Kingdom? On this website you can find historical weather averages for many cities in the United Kingdom. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.