Climate averages 1991–2020
Galway weather
in December.
A cool, wet month: the 11th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
December is a cool month in Galway: daytime highs average 8.3°C and nights cool to about 4.1°C. By daytime temperature it is the 11th warmest of the 12 months.
Expect about 104 mm of rain on roughly 15 days, which makes December a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 7 h 38 min on an average December day.
The nearest other city in this atlas is Limerick (73 km away). In December its highs average 8.4°C, about as warm as Galway, with 99 mm of rain.
Among the 5 cities listed in Ireland, Galway ranks 3rd of 5 for the warmest December highs and 5th of 5 for the driest December (rainfall, lowest first). The mean December high of those 5 cities is 8.3°C; Galway is level with that mean.
From December to January, average highs fall by 0.2°C to 8.0°C, and monthly rainfall falls from 104 mm to 99 mm.
The annual picture
December in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Galway climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.0°C3.8°C | 3.8°C | 99 | 15.4 | 8.18 h |
| February | 8.5°C3.5°C | 3.5°C | 85 | 13.0 | 9.810 h |
| March | 9.9°C4.1°C | 4.1°C | 78 | 13.3 | 11.812 h |
| April | 12.2°C5.5°C | 5.5°C | 76 | 13.7 | 13.914 h |
| May | 14.8°C8.2°C | 8.2°C | 79 | 13.5 | 15.816 h |
| June | 16.9°C10.6°C | 10.6°C | 79 | 12.9 | 16.917 h |
| July | 18.0°C12.3°C | 12.3°C | 83 | 14.5 | 16.416 h |
| August | 17.8°C12.2°C | 12.2°C | 91 | 14.0 | 14.815 h |
| September | 16.2°C10.8°C | 10.8°C | 75 | 12.3 | 12.713 h |
| October | 13.1°C8.3°C | 8.3°C | 95 | 14.0 | 10.611 h |
| November | 10.2°C5.8°C | 5.8°C | 101 | 14.3 | 8.79 h |
| December, selected | 8.3°C4.1°C | 4.1°C | 104 | 15.2 | 7.68 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
December in nearby cities
- Limerick in DecemberIreland · 73 kmHigh 8.4°C · Low 3.9°C · 99 mm rain
- Cork in DecemberIreland · 158 kmHigh 9.1°C · Low 5.3°C · 84 mm rain
- Tallaght in DecemberIreland · 178 kmHigh 7.6°C · Low 3.4°C · 76 mm rain
- Dublin in DecemberIreland · 186 kmHigh 8.1°C · Low 4.0°C · 76 mm rain
- Derry in DecemberUnited Kingdom · 223 kmHigh 7.4°C · Low 3.4°C · 90 mm rain
- Lisburn in DecemberUnited Kingdom · 242 kmHigh 7.5°C · Low 3.6°C · 82 mm rain
- Belfast in DecemberUnited Kingdom · 252 kmHigh 7.9°C · Low 4.4°C · 82 mm rain
- Douglas in DecemberIsle of Man · 316 kmHigh 8.9°C · Low 6.6°C · 114 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Galway) is explained once on the Galway year overview and on the Sources, method and limits page.