Galway Weather in September
In Galway, September brings moderate daytime temperatures around 18°C (64°F), with nights cooling to 10°C (50°F). Expect quite a bit of rainfall this month.
Rainfall in Galway in September
Looking at the last 30 years, the data shows about 20 days with rain, averaging 86 mm (3.4 in) for the month. Rain is frequent but mostly light this month, with brief showers more common than heavy downpours.
Temperature in Galway in September
In September, Galway gets moderate temperatures, with highs of 18°C (64°F). Nights cool to around 10°C (50°F). The difference between afternoon and evening temperatures is usually noticeable. With overnight lows of 10°C (50°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Galway in September
The month is characterized by fewer sunny days, with roughly 93 hours hours of sunshine. Ideal for those who prefer a cooler, cloudier climate.For Galway itself, July generally stands out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
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 Galway's climate page.
Galway Temperature in September
Min Temperature
10°C (50°F)
Max Temperature
18°C (64°F)
Chance of Rain
65%
Precipitation
86 mm (3.4 in)
Rainy days
20 days
Humidity
83% *
Sunshine
93 hours *
Percentage Sunshine
26% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Galway typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 12°C (54°F).
Average temperatures in September
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 September
Historical weather for Galway in September
Browse day-by-day weather records for Galway spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Galway historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Galway.
- Galway recorded its highest September temperature of 26°C (79°F) on September 7, 2021.
- On September 25, 2024, Galway saw its coldest September day with temperatures maxing out at 10°C (50°F).
- Galway registered its coldest September night on September 27, 2007, with temperatures dropping to 2°C (36°F).
Best Places in Ireland in September
Find out more about the weather in Ireland and which places have the best travel conditions in this month. See all of Ireland in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Galway in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Expect heavy rainfall, so bring good rain protection and waterproof bags. You can probably leave your sunglasses at home, because sunny days are pretty rare this month.What To Do in Galway in September
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 Galway's climate page.
Temperature Rainfall Sunshine Humidity
See the full Galway climate overview or explore weather in Ireland.
