Randalstown Weather in September

September in Randalstown brings moderate temperatures, with daytime highs of 17°C (63°F) and nights around 10°C (50°F). Quite a bit of rainfall is expected, around 78 mm (3.1 in), so pack an umbrella.

Rainfall in Randalstown in September

Typically, you can expect about 19 days of rain this month, with 78 mm (3.1 in) on average. 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 Randalstown in September

Daytime temperatures in Randalstown reach 17°C (63°F) in September, dropping to 10°C (50°F) at night. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights drop to around 10°C (50°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.

Sunshine in Randalstown in September

The area enjoys a balanced 109 hours of sunlight, ensuring it's neither too overcast nor too sunny.

Wind Speed in Randalstown in September

Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.

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.

If your ideal day consists of dry skies and pleasant temperatures, July typically offers the best circumstances for Randalstown.

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

Randalstown Temperature in September

Min Temperature 10°C (50°F)  

Max Temperature 17°C (63°F)  

Water Temperature 13°C (55°F) *  

Chance of Rain 64%  

Precipitation 78 mm (3.1 in)  

Rainy days 19 days  

Humidity 91% *  

Windspeed 4 m/s (8 knots) *  

Sunshine 109 hours *  

Percentage Sunshine 28% *  

* Data from: Belfast, Ireland (12 KM, 8 Miles).

What to Wear in Randalstown in September

Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. With water temperatures around 13°C (55°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Sunglasses could come in handy during the sunnier parts of your trip.

What To Do in Randalstown 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 Randalstown's climate page.

More climate data for Randalstown

Temperature Rainfall Sunshine Humidity Wind Speed Water Temp

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