Best time to visit Killarney
Month-by-month weather averages for Killarney.
Killarney, Munster, Ireland
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 7.7 °C / 46 °F | 2.6 °C / 37 °F | 116 mm / 4.6 in | neither best nor good |
| February | 8.2 °C / 47 °F | 2.8 °C / 37 °F | 103 mm / 4.1 in | neither best nor good |
| March | 9.5 °C / 49 °F | 2.8 °C / 37 °F | 100 mm / 3.9 in | neither best nor good |
| April | 12 °C / 54 °F | 4.6 °C / 40 °F | 83 mm / 3.2 in | neither best nor good |
| May | 14.4 °C / 58 °F | 7.2 °C / 45 °F | 94 mm / 3.7 in | neither best nor good |
| June | 16.7 °C / 62 °F | 9.6 °C / 49 °F | 92 mm / 3.6 in | good month |
| July | 17.8 °C / 64 °F | 11.3 °C / 52 °F | 102 mm / 4 in | good month |
| August | 17.3 °C / 63 °F | 11.1 °C / 52 °F | 101 mm / 4 in | good month |
| September | 15.9 °C / 61 °F | 9.6 °C / 49 °F | 93 mm / 3.6 in | good month |
| October | 13.2 °C / 56 °F | 7.6 °C / 46 °F | 117 mm / 4.6 in | neither best nor good |
| November | 9.8 °C / 50 °F | 4.8 °C / 41 °F | 117 mm / 4.6 in | neither best nor good |
| December | 8.2 °C / 47 °F | 3.5 °C / 38 °F | 132 mm / 5.2 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: neither
- JJune: good
- JJuly: good
- AAugust: good
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Good
- June–September
Why these months
June · good
In its favour: feels like (high) 15.3 °C / 60 °F, share of daylight that is sunny 66%, average daily high 16.7 °C / 62 °F, precipitation 92 mm / 3.6 in, days with heavy rain 2.9 days, average daily low 9.6 °C / 49 °F.
Against: wet days 14.6 days, relative humidity 82%.
July · good
In its favour: feels like (high) 16.9 °C / 62 °F, share of daylight that is sunny 62%, average daily high 17.8 °C / 64 °F, precipitation 102 mm / 4 in, days with heavy rain 3.3 days, average daily low 11.3 °C / 52 °F.
Against: wet days 15.5 days, relative humidity 85%.
August · good
In its favour: feels like (high) 16 °C / 61 °F, share of daylight that is sunny 66%, average daily high 17.3 °C / 63 °F, precipitation 101 mm / 4 in, days with heavy rain 3.2 days, average daily low 11.1 °C / 52 °F.
Against: wet days 15.2 days, relative humidity 86%.
September · good
In its favour: share of daylight that is sunny 63%, feels like (high) 14.2 °C / 58 °F, average daily high 15.9 °C / 61 °F, precipitation 93 mm / 3.6 in, days with heavy rain 2.8 days, average daily low 9.6 °C / 49 °F.
Against: relative humidity 87%, wet days 13.2 days.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: good
- AApril: best
- MMay: best
- JJune: best
- JJuly: good
- AAugust: best
- SSeptember: best
- OOctober: good
- NNovember: neither
- DDecember: neither
- Best
- April–June, August–September
- Good
- March, July, October
Why these months
March · good
In its favour: average daily high 9.5 °C / 49 °F, precipitation 100 mm / 3.9 in, share of daylight that is sunny 65%, daylight per day 11.9 h, average daily low 2.8 °C / 37 °F, days with heavy rain 3.1 days, wind (daily max) 20 km/h / 13 mph, feels like (high) 6 °C / 43 °F.
Against: wet days 14.9 days.
April · best
In its favour: average daily high 12 °C / 54 °F, precipitation 83 mm / 3.2 in, days with heavy rain 2.4 days, average daily low 4.6 °C / 40 °F, share of daylight that is sunny 71%, daylight per day 13.9 h, feels like (high) 9.1 °C / 48 °F, wind (daily max) 19 km/h / 12 mph.
Against: wet days 12.9 days.
May · best
In its favour: average daily high 14.4 °C / 58 °F, precipitation 94 mm / 3.7 in, feels like (high) 12.2 °C / 54 °F, average daily low 7.2 °C / 45 °F, share of daylight that is sunny 68%, daylight per day 15.7 h, days with heavy rain 3 days, wind (daily max) 19 km/h / 12 mph.
Against: wet days 15.2 days.
June · best
In its favour: average daily high 16.7 °C / 62 °F, precipitation 92 mm / 3.6 in, feels like (high) 15.3 °C / 60 °F, average daily low 9.6 °C / 49 °F, share of daylight that is sunny 66%, daylight per day 16.7 h, days with heavy rain 2.9 days, wind (daily max) 18 km/h / 11 mph.
Against: wet days 14.6 days.
July · good
In its favour: average daily high 17.8 °C / 64 °F, precipitation 102 mm / 4 in, feels like (high) 16.9 °C / 62 °F, average daily low 11.3 °C / 52 °F, share of daylight that is sunny 62%, daylight per day 16.2 h, days with heavy rain 3.3 days, wind (daily max) 17 km/h / 11 mph.
Against: wet days 15.5 days.
August · best
In its favour: average daily high 17.3 °C / 63 °F, precipitation 101 mm / 4 in, feels like (high) 16 °C / 61 °F, average daily low 11.1 °C / 52 °F, share of daylight that is sunny 66%, daylight per day 14.6 h, days with heavy rain 3.2 days, wind (daily max) 19 km/h / 12 mph.
Against: wet days 15.2 days.
September · best
In its favour: average daily high 15.9 °C / 61 °F, precipitation 93 mm / 3.6 in, feels like (high) 14.2 °C / 58 °F, average daily low 9.6 °C / 49 °F, share of daylight that is sunny 63%, daylight per day 12.6 h, days with heavy rain 2.8 days, wind (daily max) 19 km/h / 11 mph.
Against: wet days 13.2 days.
October · good
In its favour: average daily high 13.2 °C / 56 °F, precipitation 117 mm / 4.6 in, feels like (high) 11 °C / 52 °F, average daily low 7.6 °C / 46 °F, share of daylight that is sunny 56%, wind (daily max) 20 km/h / 12 mph, daylight per day 10.6 h.
Against: wet days 15.8 days, days with heavy rain 4.2 days.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Glencoe Mountain Resort, 589 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 4.4 °C | 4.6 °C | 6 °C | 9.1 °C | 12.2 °C | 15.3 °C | 16.9 °C | 16 °C | 14.2 °C | 11 °C | 7 °C | 5 °C |
| Days with heavy rain | 3.8 days | 3.4 days | 3.1 days | 2.4 days | 3 days | 2.9 days | 3.3 days | 3.2 days | 2.8 days | 4.2 days | 3.9 days | 4.6 days |
| Time rain usually falls | 3 pm | 3 pm | 4 pm | 5 pm | 3 pm | 5 pm | 3 pm | 3 pm | 1 pm | 2 pm | 3 pm | 2 pm |
| Sunshine per day | 4.5 h | 5.7 h | 7.7 h | 9.8 h | 10.7 h | 11.1 h | 10.1 h | 9.6 h | 8 h | 6 h | 4.8 h | 3.7 h |
| Relative humidity | 91% | 88% | 85% | 81% | 82% | 82% | 85% | 86% | 87% | 89% | 91% | 91% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 4.7 µg/m³ | 4.8 µg/m³ | 5.9 µg/m³ | 6.4 µg/m³ | 7.1 µg/m³ | 6.7 µg/m³ | 5.7 µg/m³ | 7.2 µg/m³ | 5.7 µg/m³ | 4.9 µg/m³ | 4.4 µg/m³ | 4.6 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 7.4 µg/m³ | 7.9 µg/m³ | 9.5 µg/m³ | 10.2 µg/m³ | 11.7 µg/m³ | 10.5 µg/m³ | 8.9 µg/m³ | 11.2 µg/m³ | 8.7 µg/m³ | 7.3 µg/m³ | 6.9 µg/m³ | 7.1 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.