Best year time to visit Letterkenny

General weather information about Letterkenny

Average annual temperature is 10.7 °C

Absolute maximum temperature: 26.1 °C

Absolute minimum temperature: -3.1 °C

Number of sunny days: 65 days

Number of rainy days: 298 days

Number of snow days: 2 days

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* Weather data for Letterkenny Ireland is based on climate observations for 2026 year

Letterkenny air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)12.113.715.017.820.825.822.623.226.120.213.212.7
Average daytime temperature (°C)7.99.99.712.615.921.117.318.018.114.09.58.9
Average temperature (°C)5.97.66.59.112.116.714.615.114.511.47.27.1
Average night temperature (°C)3.74.83.55.48.112.211.812.311.48.94.85.3
Absolute minimum temperature (°C)-2.5-1.6-3.10.74.87.99.37.87.22.4-1.2-1.4

Letterkenny monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)8.010.012.015.016.017.017.015.013.011.09.07.0
Daylight mean duration (h)7.99.711.914.116.117.316.714.912.710.58.47.3
Daylight minimum duration (h)7.08.010.013.015.016.015.013.011.09.07.07.0
Sunshine mean duration (h)2.43.14.47.38.111.58.48.36.54.33.61.6
Precipitation (mm)8558130955986185127121108122181
Sunny days66561011024483
Rainy days242225242119312926272228
Snow days101000000000

Letterkenny - weather forecast by months

Letterkenny weather in januaryLetterkenny weather in februaryLetterkenny weather in marchLetterkenny weather in aprilLetterkenny weather in mayLetterkenny weather in juneLetterkenny weather in julyLetterkenny weather in augustLetterkenny weather in septemberLetterkenny weather in octoberLetterkenny weather in novemberLetterkenny weather in december

Best time to visit Letterkenny:

The best time to visit Letterkenny during the most sunny months:

  • April — 7.3(h)
  • May — 8.1(h)
  • June — 11.5(h)
  • July — 8.4(h)
  • August — 8.3(h)

Months with the longest average daylight duration in Letterkenny:

  • May — 16.1(h)
  • June — 17.3(h)
  • July — 16.7(h)

The largest precipitation sum in Letterkenny is at

  • July — 185(mm)
  • December — 181(mm)

    • Weather forecast in the closest to Letterkenny admin centers

    Weather forecast in the closest towns to Letterkenny

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    Frequently asked questions

    When is the best time to visit Letterkenny?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Letterkenny.
    What is the weather like in Letterkenny?
    See average temperature, rainfall and daylight hours for Letterkenny by month in the table above.
    How many sunny days does Letterkenny have?
    The monthly weather statistics above show sunshine and rainfall patterns for Letterkenny throughout the year.