Month by month
| Month | Afternoon | Sea | Rain | Verdict |
|---|---|---|---|---|
| January | 7.4 °C | 8.9 °C | 20 days | Unfavourable season |
| February | 8 °C | 8.3 °C | 19 days | Unfavourable season |
| March | 9.3 °C | 8.5 °C | 19 days | Unfavourable season |
| April | 11.6 °C | 9.7 °C | 16 days | Unfavourable season |
| May | 14.7 °C | 11.7 °C | 16 days | Possible, with trade-offs |
| June | 16.7 °C | 13.9 °C | 19 days | Unfavourable season |
| July | 17.2 °C | 15.2 °C | 22 days | Unfavourable season |
| August | 17.3 °C | 15.7 °C | 23 days | Unfavourable season |
| September | 15.7 °C | 15 °C | 19 days | Unfavourable season |
| October | 12.8 °C | 13.4 °C | 19 days | Unfavourable season |
| November | 9.5 °C | 11.7 °C | 19 days | Unfavourable season |
| December | 8.2 °C | 10.1 °C | 21 days | Unfavourable season |
Before you go
Three things to check once you have picked your dates.
Entry
Ireland is in the European Union. Entry rules depend on your nationality — check before booking.
Safety
No specific restrictions
Usual precautions apply.
Official advice updated 4 September 2026
Health
Recommended vaccinations, water quality, mosquitoes: advice depends on the country and the season. Some vaccines need time before departure.
Beau Fixe is not a safety or health authority. These notes summarise public advisories and link to their source; only the competent authorities are authoritative. Alert levels: Foreign, Commonwealth & Development Office (gov.uk), Open Government Licence v3.0.
FAQ
Can you swim in Sligo in December?
The sea averages 10.1°C in December — too cold for most swimmers.
How hot is Sligo in December?
Expect 8.2°C in the afternoon and 4.1°C at night, averaged over the last 10 years.
Does it rain a lot in Sligo in December?
Around 21 days with rain (≥ 1 mm) in the month — 69% of days.