Water temperature in Holywood in July

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Is it warm enough to swim in Holywood in July? Average water temperature in Holywood in July is 13.5°C and therefore is not suitable for comfortable swimming. The warmest sea in Holywood in July is 17.4°C, and the coldest is 10.8°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Holywood

Changes water temperature in Holywood in July 2025, 2024

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

Sea temperature

Sea state

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 July	14.5°C	13.4°C	11°C	14.5°C
2 July	14.8°C	13.2°C	10.9°C	14.8°C
3 July	15.1°C	13.4°C	10.8°C	15.1°C
4 July	14.7°C	13.6°C	10.8°C	14.7°C
5 July	14.4°C	13.3°C	11.2°C	14.4°C
6 July	14.3°C	13.5°C	11.4°C	15.1°C
7 July	14.7°C	13.2°C	11.7°C	14.7°C
8 July	14.5°C	13.1°C	11.8°C	14.9°C
9 July	14.8°C	13°C	11.8°C	15.2°C
10 July	15.6°C	13°C	11.9°C	15.6°C
11 July	16.5°C	13.6°C	12.1°C	16.5°C
12 July	16.9°C	14°C	12.3°C	16.9°C
13 July	16.8°C	13.9°C	12.3°C	16.8°C
14 July	16.8°C	13.8°C	12.4°C	16.8°C
15 July	16.2°C	13.7°C	12.5°C	16.2°C

Day	2025	2024	Min	Max
16 July	16.4°C	14°C	12.5°C	16.4°C
17 July	16.6°C	14.1°C	12.1°C	16.6°C
18 July	16.2°C	14°C	12.1°C	16.2°C
19 July	15.9°C	14°C	12°C	16°C
20 July	15.6°C	14.3°C	12.4°C	16.2°C
21 July	15.3°C	14.1°C	12.4°C	16.1°C
22 July	15.2°C	14.2°C	12.4°C	15.9°C
23 July	15.2°C	14.3°C	12.4°C	16°C
24 July	15°C	14.1°C	12.4°C	16.2°C
25 July	14.8°C	14.7°C	12.4°C	17°C
26 July	14.7°C	14.4°C	12.3°C	17.4°C
27 July	15.2°C	14.2°C	12.2°C	17.3°C
28 July	15°C	14.5°C	12.1°C	16.9°C
29 July	14.9°C	14.1°C	12.3°C	16.5°C
30 July	14.9°C	14.5°C	12.4°C	16.2°C
31 July	15°C	14.4°C	12.4°C	15.9°C

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Average water temperature in Holywood in July over a decade

2016	2017	2018	2019	2020
12.7°C	13°C	13.9°C	14.3°C	13.7°C

2021	2022	2023	2024	2025
15.5°C	14.2°C	14.5°C	13.9°C	15.4°C

Holywood 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 July. In addition, the maximum and minimum water temperatures for that month, recorded over the last decade, are shown

	Avr	Min	Max
Dundrum	14.2°C	12.4°C	18.9°C
Portpatrick	13.5°C	11.5°C	15.5°C
Cushendun	12.7°C	10.6°C	14.7°C
Cushendall	12.7°C	10.6°C	14.6°C
Ardglass	14°C	11.8°C	17.5°C
Stranraer	13.9°C	11.6°C	16.4°C
Cairnryan	14°C	11.7°C	17.1°C
Annalong	14.5°C	12.5°C	18.8°C
Rostrevor	15°C	12.9°C	19.9°C
Ballycastle	12.7°C	10.8°C	14.8°C

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Our report for Holywood 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