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
I'm comfortable up to 27°C feels-like
22° heat-averse 30° heat-loving

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.

Saved to this browser. Changes update the strips below.
Recent · 2020-2024
Interest Google Trends 2021-2025 searches, not arrivals (?)
Day · avg daily high (?)
Night · avg overnight low (?)
UV index · On a typical day around midday, UV is about this (?)
1234444211
On the sunniest 1 in 10 days, UV reaches this — and even higher
463
PM2.5 air quality · on a typical day (?)
355565445444
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
5811999567676
June 5/10 feels 14°C (+3°C vs 1991-2020) · HCI 49/100
Day 16° · Night 11° 74% humidity 23 km/h wind 17 rain days (214h) 234h sun
Thermal 5
Sky 4
Rain 3
Wind 9

Higher = better, including rain & wind (green = "doesn't hurt the score", not "lots of it").

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.

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 Quiet 4
May 9–14 11 16 207 12.9 75% 23 242 4 Quiet 5
Jun 11–16 14 17 214 12.6 74% 23 234 4 Quiet 5
Jul 12–17 15 20 273 13.7 78% 22 214 4 Quiet 4
Aug 12–17 16 19 245 12.9 78% 23 221 4 Quiet 4
Sep 11–16 14 17 218 12.8 77% 25 173 2 Quiet 5
Oct 10–14 10 21 246 11.7 79% 30 123 1 Quiet 3
Nov 7–11 7 17 207 12.2 81% 29 84 1 Peak 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

5/10

11–16°C (feels 14°C) · 17 rain days (214h) · 234 sun hours · 74% humidity · Quiet crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (moderate)

September

5/10

11–16°C (feels 14°C) · 17 rain days (218h) · 173 sun hours · 77% humidity · Quiet crowd · UV 2 (low) · sunniest 1 in 10 days reach 3 (moderate)

May

5/10

9–14°C (feels 11°C) · 16 rain days (207h) · 242 sun hours · 75% humidity · Quiet crowd · UV 4 (moderate)

Every month

Show the other 9 months in detail

January

3/10

4–8°C (feels 3°C) · 17 rain days (202h) · 85 sun hours · 81% humidity · Quiet crowd

February

3/10

4–9°C (feels 4°C) · 19 rain days (238h) · 106 sun hours · 78% humidity · Quiet crowd · UV 1 (low)

March

4/10

5–10°C (feels 5°C) · 16 rain days (200h) · 161 sun hours · 75% humidity · Moderate crowd · UV 2 (low)

April

4/10

6–11°C (feels 7°C) · 15 rain days (186h) · 208 sun hours · 71% humidity · Quiet crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)

July

4/10

12–17°C (feels 15°C) · 20 rain days (273h) · 214 sun hours · 78% humidity · Quiet crowd · UV 4 (moderate)

August

4/10

12–17°C (feels 16°C) · 19 rain days (245h) · 221 sun hours · 78% humidity · Quiet crowd · UV 4 (moderate)

October

3/10

10–14°C (feels 10°C) · 21 rain days (246h) · 123 sun hours · 79% humidity · Quiet crowd · UV 1 (low)

November

4/10

7–11°C (feels 7°C) · 17 rain days (207h) · 84 sun hours · 81% humidity · Peak crowd · UV 1 (low)

December

2/10

5–9°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 February and peaks in November. 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.