Rosslare Weather in September
In Rosslare, September brings moderate daytime temperatures around 17°C (63°F), with nights cooling to 14°C (57°F). Expect quite a bit of rainfall this month.
Rainfall in Rosslare in September
Rain is expected on roughly 15 days, totalling around 81 mm (3.2 in) for the month. A fairly balanced picture this month, some wet days but nothing too extreme in terms of intensity.
Temperature in Rosslare in September
Daytime temperatures in Rosslare reach 17°C (63°F) in September, dropping to 14°C (57°F) at night. Even when the weather is stable, mornings and evenings can still feel distinctly cool. With overnight lows of 14°C (57°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 Rosslare in September
With about 144 hours of sunshine, the area enjoys a nice balance of sun and overcast, creating a pleasant environment.
Wind Speed in Rosslare in September
Wind speeds average 5 m/s (10 knots) during September. At this speed, gentle to moderate breezes make small trees sway and the wind creates whitecaps on water bodies. Daily variations range from moderate winds to stronger breezes, creating excellent conditions for sailing, kite flying and wind sports.
Average water temperature in September
The water is 15°C (59°F) this month, cool enough to feel refreshing on a warm day, but cold enough that most people won't stay in for long without a wetsuit.If your ideal day consists of dry skies and pleasant temperatures, August typically offers the best circumstances for Rosslare.
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 Rosslare's climate page.
Rosslare Temperature in September
Min Temperature
14°C (57°F)
Max Temperature
17°C (63°F)
Water Temperature
15°C (59°F)
Chance of Rain
50%
Precipitation
81 mm (3.2 in)
Rainy days
15 days
Humidity
77%
Windspeed
5 m/s (10 knots)
Sunshine
144 hours
Percentage Sunshine
40%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Rosslare typically stay consistent throughout September, with daily highs averaging around 17°C (63°F). Nights are cool, with lows typically ranging from 11°C (52°F) to 13°C (55°F).
Average temperatures in September
Historical weather for Rosslare in September
Browse day-by-day weather records for Rosslare spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Rosslare historical weather extremes in September
According to our 49 years of weather records for Rosslare, the following extremes were recorded between 1976 and 2025.
- The hottest September day on record in Rosslare reached 23°C (73°F) (September 6, 2023).
- On September 25, 2012, Rosslare saw its coldest September day with temperatures maxing out at 11°C (52°F).
- The lowest overnight temperature recorded in September was 3°C (37°F) (September 29, 1982).
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 Rosslare in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 15°C (59°F), the water is quite cold for swimming. You can skip the swimwear unless you're particularly tough. Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Rosslare 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 Rosslare's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Rosslare climate overview or explore weather in Ireland.
