Ballymena Weather in September

Thinking of visiting Ballymena in September? Expect moderate temperatures reaching 17°C (63°F) during the day, dropping to 10°C (50°F) at night, and note that quite a bit of rainfall is likely.

Rainfall in Ballymena in September

On average, there are about 20 days with rain during this month, averaging 82 mm (3.2 in). Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.

Temperature in Ballymena in September

In September, Ballymena sees moderate temperatures, with highs of 17°C (63°F). Nights drop to around 10°C (50°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Ballymena in September

The month brings about 109 hours of sunlight, offering a comfortable mix of sun and overcast.

Wind Speed in Ballymena in September

September sees wind speeds averaging 4 m/s (8 knots). You'll experience variable conditions with moderate winds that create small waves on water and keep branches moving. Conditions range from light winds to moderate breezes throughout the month.

Average water temperature in September

At 13°C (55°F), the water is cool but manageable for those who don't mind a bit of a shock getting in. Most people adjust after a few minutes.

Should you favor a climate that's both dry and comfortably warm, July and August typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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For a detailed overview over the year and the best time to visit the United Kingdom, check out our Ballymena's climate page.

Ballymena Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 17°C (63°F)  

Water Temperature 13°C (55°F) *  

Chance of Rain 65%  

Precipitation 82 mm (3.2 in)  

Rainy days 20 days  

Humidity 91% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 109 hours *  

Percentage Sunshine 28% *  

* Data from: Belfast, Ireland (24 KM, 15 Miles).

What to Wear in Ballymena in September

For Ballymena in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. High rain levels are expected, so pack waterproof gear and an umbrella or poncho. The water temperature sits at about 13°C (55°F), which is too chilly for most people to enjoy swimming. Leave the swimsuit at home unless you love cold water. Bring sunglasses since you'll have some sunny periods throughout the month

What To Do in Ballymena in September

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

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United Kingdom, check out our Ballymena's climate page.

More climate data for Ballymena

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

See the full Ballymena climate overview or explore weather in the United Kingdom.