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Sea Temperature in Dun Laoghaire in September
Complete information on the sea temperature range in the Irish Sea in Dun Laoghaire in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Dun Laoghaire. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.
Water Temperature Range in Dun Laoghaire in September
13°C
MINIMUN
15°C
AVERAGE
17°C
MAXIMUM
Historical Data of Water Temperature in September in Dun Laoghaire
Water Temperature Chart for Irish Sea in Dun Laoghaire in September
Sea Temperature Table in Dun Laoghaire in September Over the Past Years
| Day | 2024 | 2023 | 2022 | Average |
|---|---|---|---|---|
| Sep 1 | 15°C | 15°C | 17°C | 15.3°C |
| Sep 2 | 14°C | 15°C | 15°C | 14.8°C |
| Sep 3 | 15°C | 15°C | 17°C | 15.3°C |
| Sep 4 | 15°C | 15°C | 14°C | 14.5°C |
| Sep 5 | 15°C | 15°C | 17°C | 15.3°C |
| Sep 6 | 15°C | 15°C | 17°C | 15.3°C |
| Sep 7 | 14°C | 14°C | 16°C | 14.5°C |
| Sep 8 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 9 | 14°C | 14°C | 16°C | 14.5°C |
| Sep 10 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 11 | 14°C | 15°C | 14°C | 14.5°C |
| Sep 12 | 14°C | 15°C | 16°C | 14.8°C |
| Sep 13 | 14°C | 15°C | 15°C | 14.3°C |
| Sep 14 | 14°C | 14°C | 17°C | 14.8°C |
| Sep 15 | 15°C | 15°C | 17°C | 15.3°C |
| Sep 16 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 17 | 14°C | 15°C | 16°C | 14.8°C |
| Sep 18 | 15°C | 15°C | 14°C | 14.5°C |
| Sep 19 | 16°C | 15°C | 17°C | 15.3°C |
| Sep 20 | 16°C | 15°C | 15°C | 15.0°C |
| Sep 21 | 16°C | 15°C | 14°C | 14.8°C |
| Sep 22 | 16°C | 15°C | 15°C | 15.0°C |
| Sep 23 | 15°C | 15°C | 15°C | 14.5°C |
| Sep 24 | 16°C | 15°C | 16°C | 15.3°C |
| Sep 25 | 15°C | 15°C | 17°C | 15.3°C |
| Sep 26 | 16°C | 15°C | 15°C | 15.0°C |
| Sep 27 | 15°C | 14°C | 15°C | 14.5°C |
| Sep 28 | 15°C | 14°C | 17°C | 15.0°C |
| Sep 29 | 15°C | 14°C | 17°C | 15.0°C |
Dun Laoghaire Climate and Swimming Opportunities in September
17°C
Average Day Air Temperature
10°C
Average Night Air Temperature
59 mm
Precipitation Amount per Month
14 days
Number of Rainy Days
13 hrs
Daylight
per Day
4 hrs
Sunshine
per Day
16 km/h
Average Wind Speed
83%
Average
humidity
Dun Laoghaire lies within the Leinster in Ireland. The average daytime temperature in Dun Laoghaire in September is 17°C (63°F), while the nighttime average is 10°C (50°F). There are typically 14 rainy days during the month, with a total precipitation of 59 mm (2.3 inches). The daylight duration in September in Dun Laoghaire is 13 hours, with an average of 4 hours of sunshine per day. The average wind speed in September is 16 km/h (10 mph), and the humidity level is around 83%.
The water temperature in Dun Laoghaire in September ranges from 14°C to 15°C (57°F to 59°F). At the beginning of the month, the average temperature is around 15°C (59°F), shifting to 15°C (59°F) by mid-September and reaching 15°C (59°F) in the last ten days. Overall, the average sea temperature in Dun Laoghaire for September is 15°C (59°F). Ideal conditions for a refreshing swim, though some may still find it a bit cool.
Sea Temperature in September in Nearby Cities
Frequently Asked Questions About Water Temperatures in September in Dun Laoghaire
What is the sea temperature in Dun Laoghaire in September?
The water temperature in the Irish Sea in Dun Laoghaire in September ranges from 14°C to 15°C (57°F to 59°F).
Is it possible to swim in the Irish Sea in Dun Laoghaire in September?
The average sea temperature in Dun Laoghaire in September is 15°C (59°F), and the air temperature is 17°C (63°F), so ideal conditions for a refreshing swim, though some may still find it a bit cool.