Swords Weather in September
September in Swords brings moderate temperatures around 18°C (64°F) during the day, dropping to 11°C (52°F) at night, with quite a bit of rainfall expected, averaging around 74 mm (2.9 in) for the month.
Rainfall in Swords in September
On average, there are about 15 days with rain during this month, averaging 74 mm (2.9 in). Rain falls on many days this month, but usually in relatively small amounts. A light waterproof is more useful than a heavy umbrella.
Temperature in Swords in September
In September, Swords gets moderate temperatures, with highs of 18°C (64°F). Nights cool to around 11°C (52°F). Even when the weather is stable, mornings and evenings can still feel distinctly cool. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Swords in September
The city usually sees around 128 hours of sunlight, indicating a moderately sunny period.
Wind Speed in Swords in September
Wind speeds average 4 m/s (8 knots) during September. At this speed, expect moderate winds that can raise dust and move small branches. Since this is an average, some days have gentle light winds while others experience stronger breezes that are quite noticeable.
Average water temperature in September
The water temperature is 15°C (59°F) — chilly, but perfectly fine for a swim if you're not too sensitive to cold water. A short wetsuit can make longer sessions more comfortable.If you prefer dry days with pleasant temperatures, July and August typically offer 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 Swords's climate page.
Swords Temperature in September
Min Temperature
11°C (52°F)
Max Temperature
18°C (64°F)
Water Temperature
15°C (59°F) *
Chance of Rain
51%
Precipitation
74 mm (2.9 in)
Rainy days
15 days
Humidity
71% *
Windspeed
4 m/s (8 knots) *
Sunshine
128 hours *
Percentage Sunshine
33% *
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Swords typically stay consistent throughout September, with daily highs averaging around 18°C (64°F). Nights are cool, with lows typically ranging from 8°C (46°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 for Swords in September
Browse day-by-day weather records for Swords spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Swords historical weather extremes in September
Based on 49 years of weather observations in Swords between 1976 and 2025, these are the recorded extremes.
- Swords recorded its highest September temperature of 26°C (79°F) on September 8, 2023.
- Swords experienced its chilliest September day on September 17, 2013, reaching only 10°C (50°F).
- Swords registered its coldest September night on September 22, 2012, with temperatures dropping to 1°C (34°F).
- The heaviest September precipitation occurred on September 5, 2008, when 35 mm (1.4 in) of precipitation fell.
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
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What to Wear in Swords in September
For Swords in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. 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. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Swords 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 Swords's climate page.
Temperature Rainfall Sunshine Humidity Wind Speed Water Temp
See the full Swords climate overview or explore weather in Ireland.
