September · United Kingdom
Best time to visit Giant's Causeway in September Weather, crowds & prices
Weather in Giant's Causeway in September
Average temperature 14°C, 116 mm of rain, about 4 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
5.9/10
Ranked #6 of 12 months
- Avg temp
- 14°C
- Rainfall
- 116 mm
- Humidity
- 86%
- Days with 6h+ sun
- 4
- Crowd Density
- Moderate Crowds
- Average Expenses
- $$ · Moderate Cost ($$)
September in Giant's Causeway scores 5.9/10 for nature and wildlife travel - an above-average month (#6 of 12). Expect around 14°C, 116 mm of rain, and roughly 4 days with 6+ hours of sunshine this month.
Hexagonal basalt columns meeting Atlantic spray peak in May-September.
September in Giant's Causeway: mixed conditions, plan around the weather
Temperatures hover around 14°C (56°F) — the kind of month where neither heat nor cold forces the schedule.
116 mm of rain signals a properly wet month, with only about 4 days with 6+ hours of sunshine to count on — build indoor options into the schedule.
That is 5.9/10 on the same scale — 6th of 12 months, versus 8.8/10 for the best month here.
Pack layers you can shed by midday plus one warm layer for the evening, a proper rain shell rather than an umbrella, footwear you can get muddy.
Budget for mid-season pricing, and crowds are moderate.
If your dates are flexible, June is materially better in Giant's Causeway — 2.9 points higher on the same scale.
Frequently asked
- What is the weather like in Giant's Causeway in September?
- In September, Giant's Causeway averages 14°C, 116 mm of rain, and about 4 days with 6+ hours of sunshine. Its climate-comfort score is 5.9/10.
- Is September a good time to visit Giant's Causeway?
- September earns a 5.9/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Giant's Causeway in September?
- Expect about 116 mm of rain in September. Average humidity is 86% and there are about 4 days with 6+ hours of sunshine.
Curated in Giant's Causeway
Tickets & experiences
Things to do in Giant's Causeway
Giant's Causeway, United Kingdom. Live activities and tours from GetYourGuide, matched to this destination.