Binningen sees near-hot September day with 29.4 degrees Celsius.
September 16, 2026The unusually warm day at Binningen reached 29.4°C, just below the hot-day threshold, and ranked 66th among daily maxima over the past year. However, it ranked only 119th among all September days on record, well outside the top 100 hottest September days in the station's history.
It was an unusually hot day at the NBCN weather station in Binningen. The minimum temperature was 13.8 degrees Celsius, the maximum reached 29.4 degrees Celsius, and the daily mean was 21.5 degrees Celsius. Although the maximum fell just short of the 30-degree threshold, the day was still exceptionally warm for the season. Hot days are defined as days with a maximum temperature of at least 30 degrees Celsius, and tropical nights occur when the temperature does not drop below 20 degrees Celsius.
Looking at the last 30 days, the average air temperature was 20.62 degrees Celsius. The lowest temperature recorded in that period was 8.1 degrees Celsius, while the highest was 34.4 degrees Celsius. There were 23 summer days, 6 hot days, and no tropical nights during this stretch.
For the current season, the day of interest stands out as one of the warmer days. Compared to the last 365 days, the maximum temperature on 15 September 2026 ranked 66th, and the mean temperature ranked 74th. This places the day well within the upper quarter of the past year.
Historically, the hottest September day ever recorded at this station occurred on 6 September 1949, with a maximum temperature of 35.0 degrees Celsius. The second hottest was 12 September 1947 at 34.7 degrees, followed by 19 September 1947 at 34.5 degrees, and then 5 September 1949 and 3 September 1962, both at 34.1 degrees. These top five hottest September days are listed in Table 1.
The maximum temperature of 29.4 degrees Celsius on 15 September 2026 ranks 119th among all September days on record. This means that while the day was very warm, it did not enter the top 100 hottest September days in the station's history.
Table 1: Top 5 Maximum Temperatures in September since 1865
| Date | Max Temperature [°C] |
|---|---|
| 1949-09-06 | 35.0 |
| 1947-09-12 | 34.7 |
| 1947-09-19 | 34.5 |
| 1949-09-05 | 34.1 |
| 1962-09-03 | 34.1 |
Figure 1: Min, Max and Average Temperatures [°C] in September
Figure 2: Incremental Number of Heat-Days (≥ 30 °C)
Additional resources: meteostat
🤖 This text was generated with the assistance of AI. All quantitative statements are derived directly from the dataset listed under Data Source.