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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

55°F

MINIMUN

58°F

AVERAGE

61°F

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

Day202420232022Average
Sep 157°C59°C57°C58°C
Sep 257°C59°C57°C58°C
Sep 359°C59°C59°C59°C
Sep 459°C57°C59°C58°C
Sep 559°C59°C59°C59°C
Sep 657°C55°C59°C57°C
Sep 757°C57°C57°C57°C
Sep 857°C57°C57°C57°C
Sep 957°C59°C57°C58°C
Sep 1057°C59°C59°C58°C
Sep 1157°C55°C57°C57°C
Sep 1257°C55°C57°C57°C
Sep 1357°C59°C59°C58°C
Sep 1457°C59°C57°C58°C
Sep 1557°C55°C57°C57°C
Sep 1657°C59°C59°C58°C
Sep 1755°C57°C57°C56°C
Sep 1859°C59°C57°C58°C
Sep 1957°C55°C57°C56°C
Sep 2059°C59°C57°C58°C
Sep 2157°C55°C59°C57°C
Sep 2259°C59°C57°C58°C
Sep 2359°C55°C57°C57°C
Sep 2457°C59°C57°C58°C
Sep 2559°C57°C57°C58°C
Sep 2657°C59°C57°C58°C
Sep 2759°C55°C57°C57°C
Sep 2857°C55°C57°C57°C
Sep 2957°C59°C57°C58°C
Northen Ireland, United KingdomNorthen Ireland, United KingdomNorthen Ireland, United Kingdom

Castlerock Climate and Swimming Opportunities in September

61°F

Average Day Air Temperature

50°F

Average Night Air Temperature

4 in

Precipitation Amount per Month

16 days

Number of Rainy Days

13 hrs

Daylight
per Day

3 hrs

Sunshine
per Day

10 mph

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.

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.