Letterkenny Weather in October
October in Letterkenny brings moderate temperatures around 14°C (57°F) during the day, dropping to 8°C (46°F) at night, with quite a bit of rainfall expected, averaging around 111 mm (4.4 in) for the month.
Rainfall in Letterkenny in October
You can expect rain on roughly 23 days based on historical data, averaging 111 mm (4.4 in) for the month. This month brings frequent, heavy showers. Both the number of wet days and the rainfall totals are on the high side.
Temperature in Letterkenny in October
October in Letterkenny sees highs of 14°C (57°F) and lows of 8°C (46°F) overnight. A light jacket or extra layer can be useful, especially outside the warmest hours of the day. Nights fall to 8°C (46°F), which is cold enough to feel it indoors too. A good thick duvet makes all the difference for a comfortable night's sleep.
Sunshine in Letterkenny in October
The month brings about 103 hours of sunlight, offering a comfortable mix of sun and overcast.If your ideal day consists of dry skies and pleasant temperatures, May, July, August and September typically offer the best circumstances for Letterkenny.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Letterkenny's climate page.
Letterkenny Temperature in October
Min Temperature
8°C (46°F)
Max Temperature
14°C (57°F)
Chance of Rain
78%
Precipitation
111 mm (4.4 in)
Rainy days
23 days
Sunshine
103 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Letterkenny typically stay consistent throughout October, with daily highs averaging around 14°C (57°F). Nights are cold, with lows typically ranging from 6°C (43°F) to 9°C (48°F).
Average temperatures in October
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in October
Historical weather for Letterkenny in October
Browse day-by-day weather records for Letterkenny spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Letterkenny historical weather extremes in October
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Letterkenny.
- The hottest October day on record in Letterkenny reached 20°C (68°F) (October 8, 1995).
- The coldest October day was on October 29, 2008, with a maximum of 4°C (39°F).
- The lowest overnight temperature recorded in October was -2°C (28°F) (October 25, 2010).
Best Places in Ireland in October
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in October →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Letterkenny in October
The weather can swing between comfortable and chilly in October, so flexibility is key. Pack a variety of tops, at least one warm layer, and both shorts and long pants. This gives you options no matter what the day brings. Expect heavy rainfall, so bring good rain protection and waterproof bags. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Letterkenny in October
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Ireland, check out our Letterkenny's climate page.
See the full Letterkenny climate overview or explore weather in Ireland.
