Belfast weather in September (County Antrim, Ireland)

Will it be warm or cold in Belfast this September? Explore our page to find a thorough overview of this month's weather conditions.

Temperatures

In September, Belfast tends to experience moderate temperatures and moderate rainfall. The temperature during the day can rise to approximately 17°C. At night, it falls to around 10°C.

Precipitation

Belfast in September usually receives moderate rainfall, averaging around 77 mm for the month. This month experiences about 19 days of rain according to historical data.

Average sunshine

The city usually sees around 109 hours of sunlight, indicating a moderately sunny period.

If you prefer dry days with pleasant temperatures, July typically offers the best circumstances. While January, February and December tend to showcase 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 10°C  

Max Temperature 17°C  

Water Temperature 13°C  

Chance of Rain 63%  

Precipitation 77 mm  

Rainy days 19 days  

Humidity 91%  

Windspeed 14 km/h  

Sunshine 109 hours  

Percentage Sunshine 28%  

Where to go in Ireland in September

Find out more about the weather in Ireland 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 Ireland? On this website you can find historical weather averages for many cities in Ireland. 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.