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Sea Temperature in Castlerock in September
Complete information on the sea temperature range in the Irish Sea in Castlerock in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Castlerock. 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 Castlerock in September
13°C
MINIMUN
14.5°C
AVERAGE
16°C
MAXIMUM
Historical Data of Water Temperature in September in Castlerock
Water Temperature Chart for Irish Sea in Castlerock in September
Sea Temperature Table in Castlerock in September Over the Past Years
| Day | 2024 | 2023 | 2022 | Average |
|---|---|---|---|---|
| Sep 1 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 2 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 3 | 15°C | 15°C | 15°C | 15.0°C |
| Sep 4 | 15°C | 14°C | 15°C | 14.5°C |
| Sep 5 | 15°C | 15°C | 15°C | 14.8°C |
| Sep 6 | 14°C | 13°C | 15°C | 13.8°C |
| Sep 7 | 14°C | 14°C | 14°C | 14.0°C |
| Sep 8 | 14°C | 14°C | 14°C | 14.0°C |
| Sep 9 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 10 | 14°C | 15°C | 15°C | 14.5°C |
| Sep 11 | 14°C | 13°C | 14°C | 13.8°C |
| Sep 12 | 14°C | 13°C | 14°C | 13.8°C |
| Sep 13 | 14°C | 15°C | 15°C | 14.5°C |
| Sep 14 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 15 | 14°C | 13°C | 14°C | 13.8°C |
| Sep 16 | 14°C | 15°C | 15°C | 14.5°C |
| Sep 17 | 13°C | 14°C | 14°C | 13.5°C |
| Sep 18 | 15°C | 15°C | 14°C | 14.5°C |
| Sep 19 | 14°C | 13°C | 14°C | 13.5°C |
| Sep 20 | 15°C | 15°C | 14°C | 14.5°C |
| Sep 21 | 14°C | 13°C | 15°C | 13.8°C |
| Sep 22 | 15°C | 15°C | 14°C | 14.3°C |
| Sep 23 | 15°C | 13°C | 14°C | 14.0°C |
| Sep 24 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 25 | 15°C | 14°C | 14°C | 14.3°C |
| Sep 26 | 14°C | 15°C | 14°C | 14.3°C |
| Sep 27 | 15°C | 13°C | 14°C | 14.0°C |
| Sep 28 | 14°C | 13°C | 14°C | 13.8°C |
| Sep 29 | 14°C | 15°C | 14°C | 14.3°C |
Castlerock Climate and Swimming Opportunities in September
16°C
Average Day Air Temperature
10°C
Average Night Air Temperature
97 mm
Precipitation Amount per Month
16 days
Number of Rainy Days
13 hrs
Daylight
per Day
3 hrs
Sunshine
per Day
17 km/h
Average Wind Speed
89%
Average
humidity
Castlerock lies within the Northen Ireland in United Kingdom. The average daytime temperature in Castlerock in September is 16°C (61°F), while the nighttime average is 10°C (50°F). There are typically 16 rainy days during the month, with a total precipitation of 97 mm (3.8 inches). The daylight duration in September in Castlerock is 13 hours, with an average of 3 hours of sunshine per day. The average wind speed in September is 17 km/h (11 mph), and the humidity level is around 89%.
The water temperature in Castlerock in September ranges from 13°C to 15°C (55°F to 59°F). At the beginning of the month, the average temperature is around 14°C (57°F), shifting to 14°C (57°F) by mid-September and reaching 14°C (57°F) in the last ten days. Overall, the average sea temperature in Castlerock for September is 14°C (57°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 Castlerock
What is the sea temperature in Castlerock in September?
The water temperature in the Irish Sea in Castlerock in September ranges from 13°C to 15°C (55°F to 59°F).
Is it possible to swim in the Irish Sea in Castlerock in September?
The average sea temperature in Castlerock in September is 14°C (57°F), and the air temperature is 16°C (61°F), so ideal conditions for a refreshing swim, though some may still find it a bit cool.