Water temperature in Donegal in July

Is it warm enough to swim in Donegal in July? Average water temperature in Donegal in July is 15.7°C and therefore is not suitable for comfortable swimming. The warmest sea in Donegal in July is 20.3°C, and the coldest is 13.6°C. Average high air temperature in Donegal in July is 16°C, and average low temperature is 11°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Donegal

Changes water temperature in Donegal in July 2025, 2024

To get an accurate forecast for the water temperature in Donegal for any chosen month, compare two years within a 10 year range using the chart below. In addition to the sea water temperature in Donegal, 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

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 July	16.2°C	14.8°C	13.6°C	16.8°C
2 July	16.4°C	14.9°C	13.6°C	16.7°C
3 July	16.3°C	14.9°C	13.7°C	16.6°C
4 July	16.3°C	14.8°C	13.8°C	16.6°C
5 July	16.2°C	14.8°C	14.2°C	16.6°C
6 July	15.9°C	14.8°C	14.3°C	16.4°C
7 July	15.7°C	14.9°C	14.3°C	16.3°C
8 July	15.6°C	14.7°C	14.1°C	16.3°C
9 July	15.6°C	14.6°C	14.1°C	16.7°C
10 July	15.9°C	14.6°C	14.1°C	16.5°C
11 July	16.5°C	14.6°C	14.1°C	16.5°C
12 July	17.6°C	14.7°C	14.2°C	17.6°C
13 July	17.1°C	14.8°C	14.3°C	17.1°C
14 July	17.9°C	14.9°C	14.5°C	17.9°C
15 July	17.5°C	15.1°C	14.7°C	17.5°C

Day	2025	2024	Min	Max
16 July	17.3°C	15.7°C	14.8°C	17.3°C
17 July	17.3°C	15.8°C	14.6°C	17.3°C
18 July	17.3°C	15.8°C	14.5°C	17.5°C
19 July	17.6°C	15.8°C	14.4°C	18.4°C
20 July	17.7°C	15.6°C	14.7°C	18.9°C
21 July	17.5°C	15.6°C	14.6°C	19.3°C
22 July	17.3°C	15.5°C	14.7°C	19.5°C
23 July	17.2°C	15.6°C	14.6°C	19.8°C
24 July	17°C	15.5°C	14.7°C	20.3°C
25 July	16.8°C	15.8°C	14.8°C	20.2°C
26 July	17.4°C	15.7°C	14.6°C	19.9°C
27 July	17.3°C	15.7°C	14.4°C	19.6°C
28 July	17.2°C	16°C	14.4°C	19.2°C
29 July	17.2°C	15.5°C	14.6°C	19°C
30 July	17.2°C	16.3°C	14.7°C	18.7°C
31 July	17.5°C	16.3°C	14.8°C	18.5°C

Average water temperature in Donegal in July over a decade

2016	2017	2018	2019	2020
15.3°C	15.3°C	16.5°C	16.2°C	14.7°C

2021	2022	2023	2024	2025
17°C	15.8°C	16.5°C	15.3°C	16.9°C

Donegal sea state in July

Chart comparing the height of waves in Donegal in July over the past years. The red line indicates the height of the waves when swimming in the sea is prohibited. To view the current sea conditions, click on the graph.

Weather and climate in Donegal in July

This data display average monthly climate indicators in Donegal in July based on our historical weather readings over a period of ten years. In addition to temperature, we include data on the number of rainy and sunny days so you can have all the information about your destination before your trip

Average HIGH temperature16°C
Average LOW temperature11°C
Average rainfall days13 days
Average rainfall2.8''/71mm
Average daylight17h
Average sunshine4h
Average UV index6

Donegal 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
Rossnowlagh	15.6°C	13.6°C	20.5°C
Killybegs	15.6°C	13.6°C	21°C
Mullaghmore	15.6°C	13.5°C	19.9°C
Streedagh	15.5°C	13.4°C	19.3°C
Rosses Point	15.4°C	13.3°C	18.1°C
Strandhill	15.4°C	13.3°C	18.1°C
Dungloe	15.1°C	13.3°C	18.4°C
Sligo	15.4°C	13.3°C	18.1°C
Dunmoran	15.4°C	13.3°C	18.9°C
Easky	15.3°C	13.2°C	18.6°C

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Our report for Donegal 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