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Galway climate by month
What the weather is like
Galway has an oceanic climate (Köppen Cfb): rain spread through the year and no real dry season.
The warmest month is July, when afternoons average 19° and nights 12°. January is the coolest month, with highs of 9° and lows of 3°. The difference between the warmest and the coolest month is about 10°, a small seasonal swing typical of places tempered by the sea.
About 1,311 mm of precipitation falls in an average year. July is the wettest month (85 mm, 20 wet days) and April the driest (77 mm, 14 wet days). Cloud cover ranges from 47% in April to 54% in January.
The sea reaches about 16° in August. Sea temperatures lag the air by a month or two, so late summer is usually warmer for swimming than early summer.
Compared with Dublin, the capital, Galway is 0.8° cooler on a July afternoon and receives more precipitation over the year.
Year in figures
- Hottest afternoons
- 19° · July
- Coldest nights
- 3° · February
- Wettest month
- July
- Driest month
- April
- Clearest skies
- April · 47% cloud
- Warmest sea
- 16° · August
- Longest day
- 16 h 57 min
- Shortest day
- 7 h 33 min
Twelve months at a glance
Temperature and precipitation
Daily high/low range bars, monthly precipitation columns, sea temperature lineTemperature curve
Average high, low and seaDaylight
Hours between sunrise and sunset on the 15th of each monthClimate normals month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Average high | 9° | 9° | 11° | 14° | 16° | 18° | 19° | 19° | 17° | 14° | 11° | 9° |
| Average low | 3° | 3° | 3° | 5° | 7° | 10° | 12° | 11° | 10° | 7° | 4° | 3° |
| Precipitation | 134 mm | 101 mm | 110 mm | 77 mm | 86 mm | 85 mm | 85 mm | 109 mm | 110 mm | 143 mm | 132 mm | 139 mm |
| Wet days (≥1 mm) | 19.6 | 15.6 | 15.8 | 14.2 | 16.6 | 16.6 | 19.9 | 19.8 | 16.4 | 18.5 | 19.1 | 19.4 |
| Cloud cover | 54% | 53% | 53% | 47% | 47% | 51% | 52% | 52% | 50% | 51% | 52% | 53% |
| Sea temperature | 9° | 9° | 9° | 10° | 12° | 14° | 16° | 16° | 15° | 14° | 12° | 10° |
| Daylight | 8h 04 | 9h 51 | 11h 48 | 13h 58 | 15h 51 | 16h 57 | 16h 30 | 14h 50 | 12h 44 | 10h 39 | 8h 41 | 7h 33 |
| Month score | 15 | 15 | 19 | 37 | 49 | 58 | 58 | 58 | 54 | 38 | 20 | 15 |