Letterkenny Weather in May
Average highs run from 11°C on May 1 to 14°C on May 31, and lows from 6°C to 8°C. Normal precipitation for the month is 84 mm over about 19 wet days.
May day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
May at a glance
- Average high
- 13°C
- Average low
- 7°C
- Precipitation
- 84 mm
- Reanalysis high
- 21°CMay 28, 2012
- Reanalysis low
- 1°CMay 3, 1996
- Daylight
- 15 h 15 min to 16 h 56 min
- Cloud cover
- 74%
- Humidity
- 85%
- Dew point
- 8°C
- Wind
- 20.2 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| May 1 | 11°C | 6°C | 17°C 1997 | 2°C 2015 | 59% |
| May 2 | 12°C | 6°C | 18°C 1997 | 2°C 1993 | 58% |
| May 3 | 12°C | 6°C | 18°C 1995 | 1°C 1996 | 57% |
| May 4 | 12°C | 6°C | 17°C 2007 | 2°C 1996 | 56% |
| May 5 | 12°C | 6°C | 17°C 2008 | 3°C 2012 | 55% |
| May 6 | 12°C | 6°C | 18°C 1995 | 2°C 1997 | 55% |
| May 7 | 12°C | 6°C | 18°C 2008 | 3°C 1996 | 54% |
| May 8 | 12°C | 6°C | 20°C 2000 | 2°C 2010 | 54% |
| May 9 | 12°C | 6°C | 19°C 2016 | 3°C 1992 | 53% |
| May 10 | 12°C | 6°C | 18°C 2006 | 2°C 2005 | 54% |
| May 11 | 12°C | 6°C | 19°C 2006 | 2°C 2020 | 56% |
| May 12 | 12°C | 7°C | 20°C 2001 | 3°C 1995 | 57% |
| May 13 | 12°C | 7°C | 20°C 1998 | 3°C 1995 | 58% |
| May 14 | 12°C | 7°C | 18°C 1992 | 3°C 2020 | 59% |
| May 15 | 12°C | 7°C | 18°C 2017 | 3°C 2003 | 58% |
| May 16 | 13°C | 7°C | 18°C 2002 | 3°C 1995 | 58% |
| May 17 | 13°C | 7°C | 18°C 1992 | 3°C 1995 | 56% |
| May 18 | 13°C | 7°C | 19°C 1998 | 3°C 1996 | 56% |
| May 19 | 13°C | 7°C | 20°C 1998 | 3°C 1996 | 57% |
| May 20 | 13°C | 7°C | 19°C 2010 | 3°C 1994 | 58% |
| May 21 | 13°C | 7°C | 20°C 2010 | 5°C 1994 | 58% |
| May 22 | 13°C | 7°C | 20°C 2010 | 4°C 2006 | 58% |
| May 23 | 13°C | 8°C | 19°C 2001 | 4°C 2006 | 57% |
| May 24 | 14°C | 8°C | 20°C 2012 | 4°C 1997 | 58% |
| May 25 | 14°C | 8°C | 21°C 2017 | 4°C 2006 | 58% |
| May 26 | 14°C | 8°C | 21°C 2017 | 5°C 2000 | 58% |
| May 27 | 14°C | 8°C | 20°C 2012 | 4°C 1994 | 57% |
| May 28 | 14°C | 8°C | 21°C 2012 | 4°C 2010 | 56% |
| May 29 | 14°C | 8°C | 20°C 2018 | 4°C 2007 | 56% |
| May 30 | 14°C | 8°C | 20°C 2003 | 4°C 2015 | 56% |
| May 31 | 14°C | 8°C | 21°C 1997 | 5°C 2006 | 55% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- May 1
- sunrise 5:51 AM, sunset 9:06 PM
- May 31
- sunrise 5:01 AM, sunset 9:57 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.