Temperatures of Public Outdoor Swimming Pools in Basel, August 2025

September 6, 2025

In August 2025, Basel's outdoor pools had water temperatures averaging 23.9 °C, with an erroneous high of 128.0 °C recorded at Hallenbad Eglisee, while outdoor air temperatures averaged 20.6 °C, featuring 20 warm days and 8 heat days. Compared to August 2024, the average water temperature increased by approximately 2.2%.

In August 2025, Basel's outdoor pools, including Bachgraben Familienbad, Bachgraben Sportbad, Eglisee Familienbad, Eglisee Frauenbad, Hallenbad Eglisee, St. Jakob Familienbad, and St. Jakob Sportbad, experienced water temperatures ranging from 20.8 °C to an anomalous 128.0 °C, with an average of 23.9 °C. The highest reading of 128.0 °C was recorded at Hallenbad Eglisee on August 27, 2025, which appears to be an error. The lowest recorded temperature was 16 °C at Hallenbad Eglisee on August 22, 2024. Compared to August 2024, the average temperature increased by approximately 2.2%.

During the same period, outdoor air temperatures averaged 20.6 °C, with a maximum of 36.0 °C. There were 20 warm days with temperatures exceeding 25 °C, 1 cool day below 20 °C, and 8 heat days surpassing 30 °C.

Figure 1: Timeseries of Temperatures in Outdoor Pools in August 2025

Data source: Zeitreihe der Temperaturen der Gartenbäder
Additional resources: Further information on swimming pools

🤖 This text was generated with the assistance of AI. All quantitative statements are derived directly from the dataset listed under Data Source.