Best time to visit Giant's Causeway
Re-score for me — drag the dial — every chart on the page recolours live for your heat limit 27°C
Default 27 °C is the upper edge of the Holiday Climate Index "ideal comfort" band (Scott, Rutty, Amelung & Tang, 2016). Above this, most warm-tourism travellers report measurable discomfort.
How is this scored? HCI / Steadman / CCI gate — full methodology and citations below.
Compare with another destination
Add as many as you like — stacked below the main strips above. Each row is just the recent-window score strip and (for beach destinations) sea-temperature strip.
Tours in Giant's Causeway
18 top-rated tours via Viator. Booking links earn this site a commission at no cost to you. Map locations are approximate (centred on Giant's Causeway).
- 1
Giant's Causeway Tour from Belfast: Luxury Bus and Castles Tour - 2
Giants Causeway, Rope Bridge, Carrickfergus Castle and Dark Hedges Tour - 3
From Belfast-Giants Causeway, Dunluce Castle and Dark Hedges tour - 4
Game of Thrones Locations Tour including Westeros & Giant's Causeway - 5
Private Luxury North Coast Causeway Tour from Belfast - 6
Titanic Experience and Giant's Causeway Tour from Belfast - 7
Private Luxury Giants Causeway Trip from Belfast - 8
Giants Causeway Tour from Belfast in Luxury 7-seat Vehicle - 9
Private Tour - Causeway, Castles & Whiskey Tour - Game of Thrones - 10
Giants Causeway day trip from Belfast Cruise Terminal - 11
Giants Causeway ~ one stop tour - 12
Diamond Chauffeurs Private Giants Causeway Excursion from Belfast - 13
Private Giants Causeway Tour For Up to 15 People - 14
Giants Causeway, Belfast - Private Shore Excursion - 15
Private Mercedes Luxury Giants Causeway Coastal Tour From Belfast - 16
Game of Thrones Tour in a Executive Mercedes 7 hours From Belfast - 17
Dublin To Giants Causeway Private Luxury Tour - 18
Belfast Private Luxury Tour - Giants Causeway : Scenery & History
Last refreshed 2026-08-13.
Similar climatesManchester93% · Glasgow92% · Galway92%
Other destinations with the most-alike year-round climate to Giant's Causeway (apparent temperature, rain hours, sunshine — matched within the same trip-profile). The ±N chip compares each match's typical score for the current month against Giant's Causeway's. Based on the 2020-2024 climatology, not this year's actual weather.
Month-by-month
| Month | Temp °C | Feels °C | Rain days | Rain h | Rain h/day | Humidity | Wind km/h | Sun h | UV | Interest | Score |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | 4–8 | 3 | 17 | 202 | 11.9 | 81% | 31 | 85 | — | Quiet | 3 |
| Feb | 4–9 | 4 | 19 | 238 | 12.5 | 78% | 34 | 106 | 1 | Quiet | 3 |
| Mar | 5–10 | 5 | 16 | 200 | 12.5 | 75% | 28 | 161 | 2 | Moderate | 4 |
| Apr | 6–11 | 7 | 15 | 186 | 12.4 | 71% | 25 | 208 | 3 | Busy | 4 |
| May | 9–14 | 11 | 16 | 207 | 12.9 | 75% | 23 | 242 | 4 | Busy | 5 |
| Jun | 11–16 | 14 | 17 | 214 | 12.6 | 74% | 23 | 234 | 4 | Busy | 5 |
| Jul | 12–17 | 15 | 20 | 273 | 13.7 | 78% | 22 | 214 | 4 | Peak | 4 |
| Aug | 12–17 | 16 | 19 | 245 | 12.9 | 78% | 23 | 221 | 4 | Peak | 4 |
| Sep | 11–16 | 14 | 17 | 218 | 12.8 | 77% | 25 | 173 | 2 | Moderate | 5 |
| Oct | 10–14 | 10 | 21 | 246 | 11.7 | 79% | 30 | 123 | 1 | Moderate | 3 |
| Nov | 7–11 | 7 | 17 | 207 | 12.2 | 81% | 29 | 84 | 1 | Quiet | 4 |
| Dec | 5–9 | 4 | 20 | 242 | 12.1 | 83% | 31 | 63 | — | Quiet | 2 |
UV Index in Giant's Causeway by Month
UV index in Giant's Causeway peaks at 4 (moderate) in June, dropping to 0 (low) in January.
Best months in detail
June
5/1011–16°C (feels 14°C) · 17 rain days (214h) · 234 sun hours · 74% humidity · Busy crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (moderate)
September
5/1011–16°C (feels 14°C) · 17 rain days (218h) · 173 sun hours · 77% humidity · Moderate crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)
May
5/109–14°C (feels 11°C) · 16 rain days (207h) · 242 sun hours · 75% humidity · Busy crowd · UV 4 (moderate)
Every month
Show the other 9 months in detail
January
3/104–8°C (feels 3°C) · 17 rain days (202h) · 85 sun hours · 81% humidity · Quiet crowd
February
3/104–9°C (feels 4°C) · 19 rain days (238h) · 106 sun hours · 78% humidity · Quiet crowd · UV 1 (low)
March
4/105–10°C (feels 5°C) · 16 rain days (200h) · 161 sun hours · 75% humidity · Moderate crowd · UV 2 (low)
April
4/106–11°C (feels 7°C) · 15 rain days (186h) · 208 sun hours · 71% humidity · Busy crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)
July
4/1012–17°C (feels 15°C) · 20 rain days (273h) · 214 sun hours · 78% humidity · Peak crowd · UV 4 (moderate)
August
4/1012–17°C (feels 16°C) · 19 rain days (245h) · 221 sun hours · 78% humidity · Peak crowd · UV 4 (moderate)
October
3/1010–14°C (feels 10°C) · 21 rain days (246h) · 123 sun hours · 79% humidity · Moderate crowd · UV 1 (low)
November
4/107–11°C (feels 7°C) · 17 rain days (207h) · 84 sun hours · 81% humidity · Quiet crowd · UV 1 (low)
December
2/105–9°C (feels 4°C) · 20 rain days (242h) · 63 sun hours · 83% humidity · Quiet crowd
Frequently asked questions about visiting Giant's Causeway
When is the best time to visit Giant's Causeway?
June is the highest-scoring month (5/10 on the Holiday Climate Index). Typical conditions: 11–16°C (17 rainy days). The top three months by score are June, September, May.
What is the worst time to visit Giant's Causeway?
December is the lowest-scoring month (2/10). Typical conditions: 5–9°C (20 rainy days).
When are crowds lowest in Giant's Causeway?
Search-interest seasonality (Google Trends 2021-2025) is lowest in January and peaks in July. Interest tracks both in-trip visitors and lead-time planners, so treat it as a "destination is on people's minds" signal rather than literal arrivals.
What is the UV index in Giant's Causeway by month?
UV peaks at 4 (moderate) in June and is lowest in January at 0 (low). Monthly peak values: Jan —, Feb 1, Mar 2, Apr 3, May 4, Jun 4, Jul 4, Aug 4, Sep 2, Oct 1, Nov 1, Dec —.
What is the UV index in Giant's Causeway in June?
June is the peak UV month in Giant's Causeway, with a daily-peak UV index of 4 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.
How high can UV get in Giant's Causeway on the sunniest days?
Most days look like the monthly average, but on the sunniest ~1 in 10 days UV climbs higher than the mean suggests. June is the worst case: typical days average UV 4 (moderate), but the top 10% of days reach UV 6 (moderate) — and even higher. Months where the sunniest days routinely exceed the typical reading: April, June, September. Plan sun protection for the worst case, not the average.