Castlerock weather
Our guide to the weather in Castlerock during September
We've looked at the most up-to-date weather data for Castlerock, covering the last 12 years up to 2024, plus we've asked our team of travel bloggers for their first-hand experiences in order to answer the most frequently asked questions about Castlerock weather in September.
What's the temperature like in Castlerock during September?
The temperature is extremely stable in September with average highs of 15℃ and lows just 4℃ lower at 11℃. The UV index will be moderate at this time of year, so not something to worry about for the average person. However, if you're going to be outside for long periods it's worth wearing a broad spectrum SPF 30+ sunscreen and UV-blocking sunglasses. Remember that bright surfaces, such as water and sand increase UV exposure.
Does it rain in Castlerock during September?
On average, there will be 8 rainy days during the month, amounting to 107.2mm in total. That's a significant amount of rain. For comparison, the wettest months in the UK typically sees between 80mm and 100mm, depending on where you are. There's a small chance that you'll catch a thunderstorm during your trip.
Is it windy in Castlerock during September?
You're unlikely to experience any strong winds. Expect a gentle breeze that increases to moderate at times during September. With moderate air temperatures, any breeze will feel cool.
Weather in Castlerock
Our month-by-month guide to the weather and climate in Castlerock
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