Sea Temperature

Derry average September sea temperature

Max: 15.2°C / 58.6°F

Avg: 14.3°C / 57.7°F

Min: 13.4°C / 56.8°F

These figures are calculated from several years of recorded data and are the maximum, minimum and average temperatures of all the recorded years

Average September sea temperatures


Monthly Derry water temperature chart

The bar chart below shows the average monthly sea temperatures at Derry over the year.

Average monthly sea temperatures in Derry
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
°C 9.4 8.8 8.6 9.3 10.6 12.1 13.9 14.6 14.3 13.3 12.3 10.8
°F 48.9 47.8 47.5 48.7 51.1 53.8 57 58.3 57.7 55.9 54.1 51.4

Monthly average max / min water temperatures

The graph below shows the range of monthly water temperatures over several years.

Maximum and minimum monthly sea temperatures in Derry
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Min °C 8.3 7.9 7.7 8.2 9.8 10 12.3 13.6 13.4 12.3 11.4 9.9
Max °C 10.6 9.7 9.6 10.4 11.5 14.3 15.6 15.7 15.2 14.4 13.2 11.8
Min °F 47.8 46.9 46.6 47.6 50.3 51.7 55.4 57.3 56.8 54.9 53.2 50.5
Max °F 50.1 48.7 48.5 49.8 52 56 58.7 59.4 58.6 57 55 52.4

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