Water temperature in Mainau in September

Is it warm enough to swim in Mainau in September? Average water temperature in Mainau in September is 19.6°C and therefore is not suitable for comfortable swimming. The warmest water in Mainau in September is 23.1°C, and the coldest is 16.3°C. To find out the sea temperature today and in the coming days, go to Current sea temperature in Mainau

Changes water temperature in Mainau in September 2025, 2024

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

Sunrise and Sunset

You can choose any other years:

Day	2025	2024	Min	Max
1 September	21.5°C	22.8°C	20.3°C	22.8°C
2 September	21.1°C	22.9°C	20°C	22.9°C
3 September	20.4°C	23.1°C	20°C	23.1°C
4 September	20.4°C	22.8°C	19.7°C	22.8°C
5 September	20.2°C	22.6°C	19.9°C	22.6°C
6 September	20.2°C	22.4°C	19.9°C	22.4°C
7 September	20°C	22.7°C	19.8°C	22.7°C
8 September	19.9°C	22.3°C	19.9°C	22.3°C
9 September	19.7°C	21.9°C	19.2°C	21.9°C
10 September	19.6°C	21.2°C	19.1°C	21.8°C
11 September	19.9°C	20.8°C	19.4°C	22.6°C
12 September	19.7°C	20.5°C	19.2°C	23.1°C
13 September	19.5°C	20.2°C	18.9°C	22.6°C
14 September	19.1°C	20°C	18.8°C	22.3°C
15 September	19.4°C	19.9°C	18.8°C	21.3°C

Day	2025	2024	Min	Max
16 September	19.3°C	19.8°C	18.5°C	21.4°C
17 September	18.9°C	19.6°C	18.5°C	21°C
18 September	18.8°C	19.4°C	18.1°C	20.7°C
19 September	19.3°C	19°C	18.1°C	20.8°C
20 September	19.9°C	18.7°C	18.1°C	21°C
21 September	19.9°C	18.2°C	17.9°C	21.1°C
22 September	19.5°C	18°C	17.7°C	20.6°C
23 September	19.1°C	17.8°C	17.5°C	20.8°C
24 September	18.7°C	17.5°C	17.2°C	20.1°C
25 September	18.4°C	17.3°C	17°C	19.5°C
26 September		17.1°C	16.9°C	19°C
27 September		16.8°C	16.7°C	18.6°C
28 September		16.7°C	16.7°C	19°C
29 September		16.7°C	16.5°C	18.8°C
30 September		16.6°C	16.3°C	18.9°C

Average water temperature in Mainau in September over a decade

2015	2016	2017	2018	2019
19.2°C	20.3°C	19.1°C	20.5°C	19.3°C

2020	2021	2022	2023	2024
20.5°C	19.4°C	19.4°C	20.6°C	19.8°C

Mainau 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
Uberlingen	19.7°C	16.3°C	23.6°C
Sipplingen	19.7°C	16.3°C	23.6°C
Radolfzell	19.8°C	16.3°C	23.9°C
Allensbach	19.8°C	16.3°C	23.9°C
Reichenau	19.8°C	16.3°C	23.9°C
Moos	19.8°C	16.3°C	23.9°C
Markelfingen	19.8°C	16.3°C	23.9°C
Bodman Ludwigshafen	19.7°C	16.3°C	23.9°C
Friedrichshafen	19.5°C	16.3°C	23.3°C
Langenargen	19.5°C	16.4°C	23.3°C

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Our report for Mainau 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