Water temperature in Horten in September

Is it warm enough to swim in Horten in September? Average water temperature in Horten in September is 15.3°C and therefore is not suitable for comfortable swimming. The warmest sea in Horten in September is 18.1°C, and the coldest is 12.3°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Horten

Changes water temperature in Horten in September 2025, 2024

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

Sea temperature

Tides

Weather forecast

You can choose any other years:

Day	2025	2024	Min	Max
1 September	16.3°C	16.9°C	16.3°C	18.1°C
2 September	16.8°C	16.7°C	16.3°C	17.7°C
3 September	17°C	16.7°C	16.2°C	17.7°C
4 September	16.9°C	16.6°C	15.8°C	17.6°C
5 September	16.8°C	17°C	15.5°C	17.5°C
6 September	16.7°C	16.6°C	15.4°C	17.2°C
7 September	16.6°C	17.4°C	15.3°C	17.4°C
8 September	17.7°C	16.8°C	15.2°C	17.7°C
9 September	17.3°C	17.1°C	15.1°C	17.3°C
10 September	17.5°C	17.5°C	14.9°C	17.5°C
11 September	17.1°C	16.8°C	15°C	17.1°C
12 September	17.2°C	16.3°C	14.7°C	17.6°C
13 September	16.9°C	15.6°C	14.5°C	17.2°C
14 September	16.7°C	15.1°C	14.4°C	17.1°C
15 September	16.5°C	14.9°C	14.2°C	17°C

Day	2025	2024	Min	Max
16 September	15.8°C	15.8°C	14°C	16.6°C
17 September	15.9°C	15.5°C	13.8°C	16.3°C
18 September	16.5°C	14.9°C	13.5°C	16.5°C
19 September	16°C	15°C	13.2°C	16.3°C
20 September	15.8°C	15.5°C	13°C	16.2°C
21 September	15.4°C	15.3°C	13.3°C	15.9°C
22 September	15.1°C	14.9°C	13°C	15.6°C
23 September	15°C	14.9°C	12.9°C	15.8°C
24 September	14.3°C	14.7°C	12.9°C	15.6°C
25 September	15.1°C	15.2°C	12.9°C	15.9°C
26 September	14.7°C	14.3°C	12.8°C	16°C
27 September		14°C	12.6°C	15.8°C
28 September		14.5°C	12.5°C	15.7°C
29 September		14.4°C	12.3°C	15.5°C
30 September		14.1°C	12.3°C	15.1°C

Average water temperature in Horten in September over a decade

2015	2016	2017	2018	2019
14.6°C	16.3°C	15.1°C	16.1°C	15.4°C

2020	2021	2022	2023	2024
15.7°C	15.5°C	15.5°C	16.1°C	15.7°C

Horten sea state in September

Chart comparing the height of waves in Horten in September 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.

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

	Avr	Min	Max
Moss	15.3°C	12.3°C	18.1°C
Larkollen	15.4°C	12.3°C	18°C
Selvik	15.1°C	12.3°C	18°C
Tonsberg	15.5°C	12.4°C	17.9°C
Svelvik	15.1°C	12.3°C	17.9°C
Lervik	15.4°C	12.3°C	18°C
Melsomvik	15.5°C	12.5°C	17.8°C
Fagerstrand	15.1°C	12.3°C	17.8°C
Fredrikstad	15.1°C	12.3°C	17.9°C
Sandefjord	15.6°C	12.6°C	18.3°C

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Our report for Horten 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.

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Date (day and month)

Water temperature: min 16°C

Average temperature Maximum temperature