Today, September 30, 2026, was an unusually hot day for the end of September at the NBCN weather station in Binningen. The minimum temperature was 15.3 °C, the maximum reached 29.2 °C, and the daily mean was 21.3 °C. Although the maximum did not reach the 30 °C threshold required for an official Hot Day (or Heat Day), the warmth was still notable for this late point in the season. No tropical night was recorded, as the temperature did fall below 20 °C overnight.

Looking at the last 30 days, the average air temperature was 18.86 °C, with a minimum of 5.8 °C and a maximum of 32.6 °C. During this period there were 18 summer days, 4 hot days, and no tropical nights. This shows that the recent month has been generally warm, with several days exceeding 30 °C, but the day of interest was not among the hottest of that stretch.

For the current season up to September 30, the maximum temperature of 29.2 °C ranks 70th among all daily maxima in the last 365 days, and the mean temperature of 21.3 °C ranks 75th. This places the day well within the warmer tier of the past year, but not among the most extreme. Compared to all years for the month of September, the maximum temperature of 29.2 °C ranks 128th, and the mean temperature ranks 107th. This indicates that while the day was warm, it was far from record-breaking in the historical context.

The hottest September day ever recorded at this station occurred on September 6, 1949, with a maximum of 35.0 °C. The second hottest was September 12, 1947, at 34.7 °C, followed by September 19, 1947, at 34.5 °C. The fourth and fifth hottest September days were September 5, 1949, and September 3, 1962, both reaching 34.1 °C. These top five values are shown in Table 1. In comparison, today's maximum of 29.2 °C is more than 5 °C below the all-time September record and ranks only 128th historically, underscoring that while the day felt unusually warm for the date, it was not exceptional in the long-term record.