Water temperature in Sein Island in April

Is it warm enough to swim in Sein Island in April? Average water temperature in Sein Island in April is 11.5°C and therefore is not suitable for comfortable swimming. The warmest sea in Sein Island in April is 13.7°C, and the coldest is 9.1°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Sein Island

Changes water temperature in Sein Island in April 2025, 2024

To get an accurate forecast for the water temperature in Sein Island for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Sein Island, the selected years in the table also show the values of the maximum and minimum temperatures on each of the days of April.

Sea temperature

Sea state

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 April	11.7°C	11.5°C	9.1°C	11.7°C
2 April	11.6°C	11.4°C	9.8°C	11.6°C
3 April	11.8°C	11.2°C	9.9°C	11.8°C
4 April	11.4°C	11.1°C	9.4°C	11.5°C
5 April	11.8°C	11.2°C	9.2°C	11.8°C
6 April	12.1°C	11.5°C	9.1°C	12.1°C
7 April	12.4°C	12°C	9.3°C	12.4°C
8 April	12.4°C	11.8°C	9.4°C	12.4°C
9 April	12.5°C	11.9°C	9.4°C	12.5°C
10 April	12.5°C	12°C	9.6°C	12.5°C
11 April	12.4°C	11.9°C	9.7°C	12.4°C
12 April	12.6°C	12.2°C	9.7°C	12.6°C
13 April	12.3°C	12.4°C	10.2°C	12.4°C
14 April	12.4°C	12.2°C	10°C	12.4°C
15 April	12.3°C	12.2°C	10.2°C	12.3°C

Day	2025	2024	Min	Max
16 April	12.1°C	12.2°C	10.4°C	12.3°C
17 April	12.1°C	12.3°C	10.5°C	12.4°C
18 April	12.1°C	12.4°C	10.8°C	12.6°C
19 April	12.2°C	12.2°C	10.5°C	12.5°C
20 April	12.5°C	12.4°C	11.4°C	12.5°C
21 April	12.4°C	12.4°C	11.2°C	12.6°C
22 April	12.8°C	12.1°C	10.6°C	13.2°C
23 April	12.6°C	12.3°C	11.1°C	12.9°C
24 April	12.7°C	12.2°C	11.2°C	13°C
25 April	12.7°C	12.4°C	11.5°C	13.1°C
26 April	12.6°C	12.3°C	11.1°C	13.4°C
27 April	12.2°C	12.4°C	11.4°C	13.7°C
28 April	12.9°C	12.4°C	11.5°C	13.3°C
29 April	13.3°C	12.5°C	11.5°C	13.3°C
30 April	13.4°C	12.2°C	11°C	13.7°C

Average water temperature in Sein Island in April over a decade

2016	2017	2018	2019	2020
11.1°C	11.9°C	10.9°C	11.5°C	12.1°C

2021	2022	2023	2024	2025
11.5°C	11.7°C	11.6°C	12°C	12.4°C

Sein Island water temperature during other months:

You can also view information about water temperature for other months by clicking on the month button below

Temperature in neighboring cities

The nearest locations with the average water temperature in April. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
La Palue	11.4°C	8.6°C	14.3°C
Brest	11.4°C	8.7°C	14.2°C
Plozevet	11.7°C	9.1°C	14.4°C
Camaret Sur Mer	11.4°C	8.7°C	14.3°C
Penhors	11.7°C	9.1°C	14.4°C
Pouldreuzic	11.7°C	9.1°C	14.4°C
Ploneour-Lanvern	11.8°C	9.2°C	14.4°C
Plovan	11.8°C	9.2°C	14.4°C
Treguennec	11.8°C	9.2°C	14.4°C
Crozon	11.4°C	8.6°C	14.7°C

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Our report for Sein Island is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.

Region

Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature