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Climate & Weather Averages in Letterkenny, Ireland

Currently: 37 °F. Overcast. (Weather station: Castlederg, Ireland). See more current weather

Annual Weather Averages Near Letterkenny

Averages are for Castlederg, which is 18 miles from Letterkenny.

Based on weather reports collected during 2012–2021.

All Year Climate & Weather Averages in Letterkenny

High Temp: 67 °F

Low Temp: 35 °F

Mean Temp: 49 °F

Precipitation: 4.15"

Humidity: 85%

Dew Point: 44 °F

Wind: 15 mph

Pressure: 29.88 "Hg

Visibility: 15 mi

January Climate & Weather Averages in Letterkenny

High Temp: 46 °F

Low Temp: 35 °F

Mean Temp: 40 °F

Precipitation: 5.54"

Humidity: 90%

Dew Point: 38 °F

Wind: 17 mph

Pressure: 29.79 "Hg

Visibility: 13 mi

February Climate & Weather Averages in Letterkenny

High Temp: 47 °F

Low Temp: 35 °F

Mean Temp: 41 °F

Precipitation: 5.02"

Humidity: 88%

Dew Point: 38 °F

Wind: 19 mph

Pressure: 29.80 "Hg

Visibility: 14 mi

March Climate & Weather Averages in Letterkenny

High Temp: 50 °F

Low Temp: 36 °F

Mean Temp: 43 °F

Precipitation: 3.61"

Humidity: 84%

Dew Point: 38 °F

Wind: 17 mph

Pressure: 29.92 "Hg

Visibility: 14 mi

April Climate & Weather Averages in Letterkenny

High Temp: 54 °F

Low Temp: 37 °F

Mean Temp: 45 °F

Precipitation: 2.34"

Humidity: 80%

Dew Point: 40 °F

Wind: 15 mph

Pressure: 29.96 "Hg

Visibility: 15 mi

May Climate & Weather Averages in Letterkenny

High Temp: 59 °F

Low Temp: 42 °F

Mean Temp: 51 °F

Precipitation: 3.37"

Humidity: 79%

Dew Point: 45 °F

Wind: 14 mph

Pressure: 29.96 "Hg

Visibility: 16 mi

June Climate & Weather Averages in Letterkenny

High Temp: 64 °F

Low Temp: 48 °F

Mean Temp: 56 °F

Precipitation: 3.65"

Humidity: 81%

Dew Point: 50 °F

Wind: 13 mph

Pressure: 29.96 "Hg

Visibility: 17 mi

July Climate & Weather Averages in Letterkenny

High Temp: 67 °F

Low Temp: 51 °F

Mean Temp: 59 °F

Precipitation: 3.73"

Humidity: 82%

Dew Point: 53 °F

Wind: 12 mph

Pressure: 29.94 "Hg

Visibility: 18 mi

August Climate & Weather Averages in Letterkenny

High Temp: 65 °F

Low Temp: 51 °F

Mean Temp: 58 °F

Precipitation: 4.78"

Humidity: 85%

Dew Point: 53 °F

Wind: 13 mph

Pressure: 29.88 "Hg

Visibility: 17 mi

September Climate & Weather Averages in Letterkenny

High Temp: 62 °F

Low Temp: 47 °F

Mean Temp: 54 °F

Precipitation: 3.42"

Humidity: 87%

Dew Point: 50 °F

Wind: 13 mph

Pressure: 29.96 "Hg

Visibility: 14 mi

October Climate & Weather Averages in Letterkenny

High Temp: 56 °F

Low Temp: 42 °F

Mean Temp: 49 °F

Precipitation: 4.11"

Humidity: 88%

Dew Point: 46 °F

Wind: 14 mph

Pressure: 29.84 "Hg

Visibility: 14 mi

November Climate & Weather Averages in Letterkenny

High Temp: 49 °F

Low Temp: 38 °F

Mean Temp: 44 °F

Precipitation: 4.53"

Humidity: 91%

Dew Point: 41 °F

Wind: 14 mph

Pressure: 29.82 "Hg

Visibility: 14 mi

December Climate & Weather Averages in Letterkenny

High Temp: 47 °F

Low Temp: 37 °F

Mean Temp: 42 °F

Precipitation: 5.73"

Humidity: 90%

Dew Point: 40 °F

Wind: 17 mph

Pressure: 29.76 "Hg

Visibility: 13 mi

Quick Climate Info

Hottest MonthJuly (59 °F avg)
Coldest MonthJanuary (40 °F avg)
Wettest MonthDecember (5.73" avg)
Windiest MonthFebruary (19 mph avg)
Annual precip.49.84" (per year)

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