Letterkenny weather in May 2026

Expect daytime maximum temperatures of 55°F in Letterkenny, Ireland in May based on long-term weather averages. There are 6 hours of sunshine per day on average with 19 days with some rainfall and typically 3.2 inches of rainfall in the month.

  • 55°F maximum daytime temperature in May in Letterkenny55
    55°F max day temperature
  • 6 hours of sunshine per day
  • 19 days with some rainfall in May in Letterkenny19
    19 days with some rainfall
  • 41°F minimum night-time temperature in May in Letterkenny41
    41°F min night temperature
  • 16 hours of daylight per day in May in Letterkenny16
    16 hours of daylight per day
  • No heat & humidity in May in Letterkenny0
    No heat & humidity
  • 3.2 inches monthly rainfall in May in Letterkenny3.2
    3.2 inches of monthly rainfall
  • UV (maximum) index 5 (Moderate) in May in Letterkenny5
    5 (Moderate) UV index

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The May weather guide for Ireland (Letterkenny) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C)  |  Imperial (°F)

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More about Ireland

How warm is it in Letterkenny in May?

Daytime temperatures usually reach 59°F in Letterkenny in May, falling to 45°F at night.

How sunny is it in Letterkenny in May?

There are normally 6 hours of bright sunshine each day in Letterkenny in May - that's 38% of daylight hours.

How warm is the sea around Letterkenny in May?

The average sea temperature around Letterkenny in May is 50°F.

Does it rain in Letterkenny in May?

There are usually 16 days with some rain in Letterkenny in May and the average monthly rainfall is 2.2 inches.

Letterkenny May sunrise & sunset times

Browse the sunrise and sunset times for Letterkenny in May 2026. Select a month to view Letterkenny sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 04:51 20:06
Saturday, 16th May 2026 04:22 20:34
Sunday, 31st May 2026 04:01 20:57

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