Clontarf Sea Temperature in September

Looking to find out what the average sea water temperature in Clontarf is for September? Find out what the lowest, highest, and average water temperatures are for Clontarf over the past 10 years.

Average water temperature in Clontarf for September

The average, high, and low temperatures below should help you if you can swim in the water in Clontarf in September.

18.36° C

(65.05° F)

highest: 21.76° C (71.17° F)
lowest: 16.01° C (60.82° F)

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

Water temperature range by day in September in Clontarf

The chart below shows the range of low and high temperatures by day for the month of September in Clontarf.

Water temperatures for September in Clontarf in recent years

Day	2024	2023	2022	2021
1	0° C	18.34° C	17.94° C	18.68° C
2	0° C	18.38° C	18.07° C	18.38° C
3	0° C	18.25° C	17.88° C	18.28° C
4	0° C	18.2° C	17.85° C	18.41° C
5	0° C	18.47° C	17.87° C	18.76° C
6	0° C	18.47° C	17.83° C	18.49° C
7	0° C	18.42° C	17.9° C	18.31° C
8	0° C	18.28° C	17.85° C	18.31° C
9	0° C	17.8° C	17.66° C	18.39° C
10	0° C	18.02° C	17.77° C	18.48° C
11	0° C	18° C	17.8° C	18.6° C
12	0° C	18.08° C	17.79° C	18.65° C
13	0° C	18.18° C	17.76° C	18.63° C
14	0° C	18.15° C	17.76° C	18.38° C
15	0° C	18.56° C	17.88° C	18.23° C
16	0° C	18.91° C	17.81° C	18.32° C
17	0° C	19.07° C	17.67° C	18.44° C
18	0° C	19.02° C	17.56° C	18.32° C
19	0° C	18.92° C	17.46° C	18.15° C
20	0° C	18.83° C	17.43° C	18.16° C
21	0° C	18.73° C	17.53° C	18.01° C
22	0° C	18.64° C	18.02° C	18.13° C
23	0° C	18.59° C	17.91° C	18.45° C
24	0° C	18.6° C	17.94° C	18.57° C
25	0° C	18.56° C	18.05° C	18.6° C
26	0° C	18.61° C	18.22° C	18.3° C
27	0° C	18.72° C	18.31° C	18.26° C
28	0° C	19° C	18.33° C	18.12° C
29	0° C	19.21° C	18.41° C	18.08° C
30	0° C	19.41° C	18.42° C	17.89° C