Sligo Weather in September
Sligo in September averages 17°C (63°F) during the day and 10°C (50°F) at night. Keep in mind that quite a bit of rainfall is expected this month.
Rainfall in Sligo in September
Historically, the month has about 21 days of rain, averaging 104 mm (4.1 in) in total. Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Sligo in September
September in Sligo brings typical temperatures with highs around 17°C (63°F) and lows of 10°C (50°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. Nights drop to around 10°C (50°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Sligo in September
The city usually sees around 93 hours of sunlight, indicating fewer sunny days.If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Sligo.
Sligo Temperature in September
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Chance of Rain
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Sligo Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Sligo - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Sligo typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 9°C (48°F) to 11°C (52°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 records for Sligo in September
Browse day-by-day weather records for Sligo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Sligo historical weather extremes in September
Based on 49 years of weather observations (1976-2025), these are the most extreme conditions recorded in Sligo.
- The hottest September day on record in Sligo reached 26°C (79°F) (September 7, 2023).
- The lowest daytime temperature in September was 10°C (50°F), recorded on September 24, 2012.
- Sligo registered its coldest September night on September 18, 1986, with temperatures dropping to 0°C (32°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 is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Sligo 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. Sunglasses aren't essential this month, though you might want them for the occasional bright moment.
What To Do in Sligo in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming4/10 -
Cycling5/10 -
Walking5/10 -
Camping6/10 -
Outdoor sports9/10
Sligo 3-Day Forecast
Temperature Rainfall Sunshine Humidity
See the full Sligo climate overview or explore weather in Ireland.
Popular in September
Where to go in September - average daytime high across popular destinations.
Westport
17°C (63°F) Doolin17°C (63°F) Kilkenny
18°C (64°F) Cork18°C (64°F) Kenmare18°C (64°F) Killarney17°C (63°F) Galway18°C (64°F) Dublin18°C (64°F) 
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