Lough Derg, County DonegalLough Derg, County Donegal at a Glance
When to Go
Best Time to Visit Lough Derg, County Donegal
Visit in summer (June-August) for the best weather and longest days, with spring and early autumn as quieter alternatives.
Summer
June-August · 12-17°C
Mild, long daylight hours ideal for boating, hiking and outdoor activities around the lough; also the busiest season.
Shoulder seasons (spring/early autumn)
May and September · 8-14°C
Quieter than midsummer with pleasant conditions for walking and birdwatching, though weather can change quickly.
Winter
December-February · 1-8°C
Cool, wet and often windy-fewer visitors and dramatic, brooding scenery, but outdoor plans may be limited by weather.
Weather & Climate near Lough Derg, County Donegal
Climate
Lough Derg, County Donegal's climate is classified as Oceanic - Oceanic climate with cool summers (peaking in July) and cold winters (coldest in January). Temperatures range from 2°C to 17°C. Abundant rainfall (1817 mm/year), wettest in November.
Air Quality:
AQI 25
Good
Best Time to Visit
JuneJulyAugust
Temperature & Rainfall
Temperature Range
26°
Warmest Month
-5°
Coldest Month
Monthly Conditions
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Poor | 2° - 7° | 1° | 196 mm | overcast | 93% | 5.4 m/s | 0.0 low | 7.7h |
| February | Poor | 2° - 7° | 1° | 146 mm | overcast | 92% | 5.3 m/s | 0.1 low | 9.5h |
| March | Poor | 3° - 9° | 2° | 149 mm | overcast | 90% | 5.3 m/s | 0.3 low | 11.7h |
| April | Acceptable | 5° - 11° | 5° | 106 mm | overcast | 87% | 4.6 m/s | 0.7 moderate | 13.9h |
| May | Acceptable | 7° - 14° | 10° | 105 mm | overcast | 85% | 4.4 m/s | 1.0 moderate | 15.8h |
| June | Acceptable | 9° - 16° | 13° | 106 mm | overcast | 85% | 4.2 m/s | 1.2 high | 16.9h |
| July | Acceptable | 11° - 17° | 14° | 120 mm | overcast | 86% | 4.0 m/s | 1.1 high | 16.4h |
| August | Acceptable | 12° - 17° | 14° | 140 mm | overcast | 87% | 3.9 m/s | 0.9 moderate | 14.7h |
| September | Acceptable | 9° - 15° | 12° | 159 mm | overcast | 89% | 4.3 m/s | 0.5 moderate | 12.5h |
| October | Poor | 7° - 12° | 7° | 195 mm | overcast | 91% | 4.7 m/s | 0.2 low | 10.3h |
| November | Poor | 4° - 9° | 4° | 198 mm | overcast | 93% | 4.7 m/s | 0.1 low | 8.3h |
| December | Poor | 3° - 8° | 2° | 197 mm | overcast | 93% | 4.8 m/s | 0.0 low | 7.1h |