Best time to visit Killarney

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 (?)
1234443311
On the sunniest 1 in 10 days, UV reaches this — and even higher
46654
PM2.5 air quality · on a typical day (?)
455665455445
On the worst 1 in 10 days, PM2.5 reaches this — and even higher
68101298588678
June 5/10 feels 16°C · HCI 50/100
Day 18° · Night 11° 70% humidity 18 km/h wind 18 rain days (235h) 186h sun
Thermal 6
Sky 4
Rain 3
Wind 10

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.

Tours in Killarney

6 top-rated tours via Viator. Booking links earn this site a commission at no cost to you.

  1. 1Ring of Kerry private Tour from Killarney, Car or minibus5.00★ (11)9hfrom $706🔥 Selling fast
  2. 2Killarney National Park Tour4.98★ (545)1hfrom $53
  3. 3Ring Of Kerry Tour4.81★ (626)7h 30mfrom $58
  4. 4Private Ring of Kerry Tour with Skellig Ring & Kerry Cliffs5.00★ (2)from $650
  5. 5Guided Climb of Carrauntoohil with KerryClimbing.ie4.99★ (1,130)from $94
  6. 6Private Tour:Ring of Kerry,Kerry Cliffs, starting in (from) Killarney4.87★ (190)from $360

Last refreshed 2026-06-10.

Similar climatesLimerick93% · Galway90% · Dingle88%

Other destinations with the most-alike year-round climate to Killarney (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 Killarney'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 4–9 6 17 233 13.7 85% 19 86 — Quiet 3
Feb 5–10 6 21 312 14.9 80% 24 83 1 Quiet 2
Mar 5–11 8 18 270 15.0 76% 21 137 2 Quiet 3
Apr 6–13 10 14 190 13.6 69% 19 176 3 Moderate 5
May 8–16 14 16 223 13.9 69% 19 214 4 Quiet 5
Jun 11–18 16 18 235 13.1 70% 18 186 4 Busy 5
Jul 12–19 18 21 308 14.7 74% 18 178 4 Moderate 4
Aug 13–19 18 19 282 14.8 74% 18 191 3 Peak 4
Sep 11–18 16 17 226 13.3 76% 18 154 3 Moderate 5
Oct 9–14 12 22 302 13.7 80% 20 123 1 Quiet 3
Nov 7–11 9 19 267 14.1 85% 21 80 1 Quiet 3
Dec 5–9 6 20 284 14.2 86% 22 72 — Quiet 2

UV Index in Killarney by Month

UV index in Killarney peaks at 4 (moderate) in June, dropping to 0 (low) in January.

Best months in detail

June

5/10

11–18°C (feels 16°C) · 18 rain days (235h) · 186 sun hours · 70% humidity · Busy crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (high)

September

5/10

11–18°C (feels 16°C) · 17 rain days (226h) · 154 sun hours · 76% humidity · Moderate crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)

April

5/10

6–13°C (feels 10°C) · 14 rain days (190h) · 176 sun hours · 69% humidity · Moderate crowd · UV 3 (low) · sunniest 1 in 10 days reach 4 (moderate)

Every month

Show the other 9 months in detail

January

3/10

4–9°C (feels 6°C) · 17 rain days (233h) · 86 sun hours · 85% humidity · Quiet crowd

February

2/10

5–10°C (feels 6°C) · 21 rain days (312h) · 83 sun hours · 80% humidity · Quiet crowd · UV 1 (low)

March

3/10

5–11°C (feels 8°C) · 18 rain days (270h) · 137 sun hours · 76% humidity · Quiet crowd · UV 2 (low)

May

5/10

8–16°C (feels 14°C) · 16 rain days (223h) · 214 sun hours · 69% humidity · Quiet crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 6 (moderate)

July

4/10

12–19°C · 21 rain days (308h) · 178 sun hours · 74% humidity · Moderate crowd · UV 4 (moderate) · sunniest 1 in 10 days reach 5 (moderate)

August

4/10

13–19°C · 19 rain days (282h) · 191 sun hours · 74% humidity · Peak crowd · UV 3 (moderate)

October

3/10

9–14°C (feels 12°C) · 22 rain days (302h) · 123 sun hours · 80% humidity · Quiet crowd · UV 1 (low)

November

3/10

7–11°C (feels 9°C) · 19 rain days (267h) · 80 sun hours · 85% humidity · Quiet crowd · UV 1 (low)

December

2/10

5–9°C (feels 6°C) · 20 rain days (284h) · 72 sun hours · 86% humidity · Quiet crowd

Frequently asked questions about visiting Killarney

When is the best time to visit Killarney?

June is the highest-scoring month (5/10 on the Holiday Climate Index). Typical conditions: 11–18°C (18 rainy days). The top three months by score are June, September, April.

What is the worst time to visit Killarney?

February is the lowest-scoring month (2/10). Typical conditions: 5–10°C (21 rainy days).

When are crowds lowest in Killarney?

Search-interest seasonality (Google Trends 2021-2025) is lowest in March and peaks in August. 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 Killarney 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 3, Sep 3, Oct 1, Nov 1, Dec —.

What is the UV index in Killarney in June?

June is the peak UV month in Killarney, with a daily-peak UV index of 4 (moderate). Standard sun protection — sunglasses and light SPF — is recommended.

How high can UV get in Killarney 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 (high) — and even higher. Months where the sunniest days routinely exceed the typical reading: April, May, June, July, September. Plan sun protection for the worst case, not the average.