Water temperature in Harstad in August

Is it warm enough to swim in Harstad in August? Average water temperature in Harstad in August is 12.7°C and therefore is not suitable for comfortable swimming. The warmest sea in Harstad in August is 17.4°C, and the coldest is 10.7°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Harstad

Changes water temperature in Harstad in August 2025, 2024

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

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 August	16.5°C	14.3°C	11.8°C	16.5°C
2 August	16.2°C	15.2°C	11.9°C	16.2°C
3 August	16.4°C	16.1°C	11.8°C	16.4°C
4 August	16.6°C	16.8°C	11.6°C	16.8°C
5 August	16.5°C	17.1°C	11.5°C	17.1°C
6 August	16°C	16.7°C	11.2°C	16.7°C
7 August	15.4°C	17.4°C	11.4°C	17.4°C
8 August	15.1°C	17.3°C	11.4°C	17.3°C
9 August	15°C	17°C	11.5°C	17°C
10 August	14.8°C	16.8°C	11.6°C	16.8°C
11 August	14.5°C	16.7°C	11.7°C	16.7°C
12 August	14.4°C	16.4°C	11.6°C	16.4°C
13 August	14.4°C	16.7°C	11.6°C	16.7°C
14 August	14.3°C	17.1°C	11.9°C	17.1°C
15 August	14.2°C	16.3°C	11.7°C	16.3°C

Day	2025	2024	Min	Max
16 August	13.8°C	16.4°C	11.6°C	16.4°C
17 August	13.6°C	16.2°C	11.4°C	16.2°C
18 August	13.5°C	15.9°C	11.3°C	15.9°C
19 August	13.5°C	15.4°C	11.1°C	15.4°C
20 August	13.3°C	15.9°C	11.3°C	15.9°C
21 August	13.1°C	15.5°C	11.3°C	15.5°C
22 August	13°C	15.3°C	11.3°C	15.3°C
23 August	12.8°C	14.9°C	11.2°C	14.9°C
24 August	12.8°C	15°C	11.1°C	15°C
25 August	12.7°C	14.9°C	11°C	14.9°C
26 August	12°C	14.5°C	10.9°C	14.5°C
27 August	12°C	14.2°C	10.8°C	14.2°C
28 August	12.3°C	14°C	10.8°C	14°C
29 August	12.2°C	14.1°C	10.8°C	14.1°C
30 August	12.6°C	14.4°C	10.9°C	14.4°C
31 August	12.6°C	14.3°C	10.7°C	14.3°C

Average water temperature in Harstad in August over a decade

2016	2017	2018	2019	2020
12.3°C	12.3°C	13.1°C	13.2°C	13.5°C

2021	2022	2023	2024	2025
12.3°C	12.4°C	13.5°C	15.8°C	16°C

Harstad sea state in August

Chart comparing the height of waves in Harstad in August 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.

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

	Avr	Min	Max
Evenskjer	12.8°C	10.8°C	17.1°C
Skrollsvika	12.8°C	10.7°C	17.6°C
Bogen	12.8°C	10.9°C	18°C
Lodingen	13.2°C	11°C	18.3°C
Myre	12.4°C	10.6°C	17.2°C
Ballangen	12.8°C	10.9°C	17.8°C
Tennevoll	12.8°C	10.8°C	17.2°C
Narvik	12.6°C	10.9°C	16.9°C
Sortland	12.7°C	10.7°C	17.5°C
Andenes	12.1°C	10.1°C	16.4°C

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Our report for Harstad 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