August 13, 2026, was an unusually hot day at the NBCN weather station in Binningen. The minimum temperature was 15.8 degrees Celsius, the maximum reached 36.5 degrees, and the daily mean was 26.6 degrees.

Looking at the last 30 days, the average air temperature was 24.55 degrees, with a minimum of 11.2 degrees and a maximum of 39.7 degrees. During this period there were 31 summer days, 3 hot days, and 6 tropical nights. Compared to the last 365 days, the maximum temperature on August 13 ranked 9th, while the mean temperature ranked 21st.

For the month of August across all years, the hottest day on record was August 21, 1943, with a maximum of 38.7 degrees. The second hottest was August 13, 2003, at 38.6 degrees, followed by August 19, 1943, at 38.4 degrees. The fourth and fifth hottest August days both occurred in 2026: August 4 reached 37.8 degrees and August 3 reached 37.6 degrees. These are shown in Table 1 with the top 5 hottest August days.

In the all-time ranking for August, the maximum temperature on August 13, 2026, placed 18th, while its mean temperature placed 42nd.