It was an unusually hot day at the NBCN weather station in Binningen. The minimum temperature was 21.8 °C, the maximum reached 35.8 °C, and the daily mean was 28.2 °C. This qualifies as a hot day, defined as a day with a maximum temperature of at least 30 °C.

Looking at the last 30 days, the average air temperature was 24.67 °C, with a minimum of 11.2 °C and a maximum of 39.7 °C. During this period there were 31 summer days, 23 hot days, and 5 tropical nights, where the temperature did not fall below 20 °C. The current season has therefore been marked by sustained heat.

For the month of August across all years, the hottest day on record was 21 August 1943, with a maximum of 38.7 °C. The second hottest was 13 August 2003 at 38.6 °C, followed by 19 August 1943 at 38.4 °C. The fourth and fifth hottest August days were both from the current year: 14 August 2026 reached 38.1 °C, and 4 August 2026 reached 37.8 °C. These are shown in Table 1.

Compared to all August days in the historical record, the maximum temperature of 35.8 °C on 15 August 2026 ranks 33rd. Its mean temperature of 28.2 °C ranks 7th, indicating that while the daytime peak was not among the very highest, the overall warmth of the day was historically notable.