Sligo climate — normals and trends
Sligo (Ireland) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.4 °C and it receives 1,185 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (14.6 °C on average) and the coldest is January (4.7 °C). Rainfall peaks in December.
Sligo averages 25 frost days, 0 hot days (≥ 30 °C) and 201 rainy days per year.
Sligo has warmed by +0.6 °C between 1940 and 2025, or +0.07 °C per decade. This trend is statistically significant.
The number of frost days there went from about 33 to 17 per year over the period.
The hottest day of the period reached 29.5 °C (on 12 July 2025) and the coldest -15.6 °C (on 20 December 2010).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
SligoConnacht
- coords
- 54.27°, -8.47°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.4°C
Average daily high
12.2°C
Average daily low
6.7°C
Annual rainfall
1,185mm
Sunshine / day
7.1h
Mean relative humidity
83%
Average peak wind
21.1km/h
Seasonal range
9.9°C
Frost days (< 0 °C)
25 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
201 d/yr
Annual snowfall
16.1 cm
Average feels-like high
9.5 °C
Average feels-like low
3.6 °C
Average peak gust
46.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
9.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.6 °C
since 1940
+0.1 °C per decade · r² = 0.11 · p = 0.002
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
29.5 °C
12 July 2025
Coldest day
-15.6 °C
20 December 2010
Wettest day
48 mm
1 November 1968
Windiest day
65.0 km/h
26 December 1998
Strongest gust
145.4 km/h
26 December 1998
Hottest feels-like
32.9 °C
29 July 1948
Coldest feels-like
-19.8 °C
20 December 2010
Snowiest day
14.7 cm
3 April 1961
Sunniest day
16.9 h
20 June 1941
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 7.0 °C | +0.1 °C | 59 mm | -42 mm |
| Feb | 8.3 °C | +0.8 °C | 118 mm | +32 mm |
| Mar | 11.4 °C | +2.1 °C | 50 mm | -39 mm |
| Apr | 14.8 °C | +3.2 °C | 96 mm | +15 mm |
| May | 17.2 °C | +2.9 °C | 60 mm | -36 mm |
| Jun | 17.1 °C | +0.6 °C | 125 mm | +31 mm |
| Jul | 18.9 °C | +1.3 °C | 89 mm | -13 mm |
| Aug | 19.1 °C | +1.6 °C | 92 mm | -19 mm |
| Sep | 15.3 °C | -0.4 °C | 168 mm | +66 mm |
| Oct | 12.7 °C | 0.0 °C | 130 mm | +19 mm |
| Nov | 10.0 °C | +0.7 °C | 124 mm | +22 mm |
| Dec | 8.4 °C | +0.8 °C | 106 mm | -5 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Sligo?
Sligo has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.4 °C and it receives 1,185 mm of precipitation per year.
What is the hottest day ever recorded in Sligo?
The hottest day measured in Sligo between 1940 and 2025 was 12 July 2025, reaching 29.5 °C.
What is the coldest day in Sligo?
The coldest day measured in Sligo between 1940 and 2025 was 20 December 2010, at -15.6 °C.
Does it snow in Sligo?
Yes. Sligo gets on average 16.1 cm of snow per year and has around 25 frost days.
Has the climate of Sligo warmed?
Yes: Sligo warmed by +0.6 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Sligo?
The wettest day measured in Sligo between 1940 and 2025 was 1 November 1968, with 48 mm of rain in 24 hours.
What was the windiest day in Sligo?
The windiest day measured in Sligo between 1940 and 2025 was 26 December 1998, with winds reaching 65.0 km/h.
What is the warmest month in Sligo?
The warmest month in Sligo is July (14.6 °C on average); the coldest is January (4.7 °C).
How much does it rain in Sligo?
Sligo receives on average 1,185 mm of precipitation per year, spread over about 201 rainy days.
Is it sunny in Sligo?
Sligo gets on average 7.1 hours of sunshine per day, roughly 2,592 hours per year over 1940-2025.
What is the biggest single-day snowfall in Sligo?
The heaviest 24-hour snowfall measured in Sligo between 1940 and 2025 was 3 April 1961, with 14.7 cm.
Are there tropical nights in Sligo?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Sligo.
What was the most extreme apparent temperature in Sligo?
In Sligo, between 1940 and 2025, the highest apparent temperature reached 32.9 °C on 29 July 1948, and the lowest was -19.8 °C on 20 December 2010.
Compare Sligo with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Sligo