Click on a day for an hourly weather forecast
The temperatures in La Chaux de Fonds in September are quite cold with temperatures between 8°C and 20°C, warm clothes are a must.
You can expect rain for roughly half of the month of September in La Chaux de Fonds. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in La Chaux de Fonds in September 2025.
If you’re planning to visit La Chaux de Fonds in the near future, we highly recommend that you review the 14 day weather forecast for La Chaux de Fonds before you arrive.
Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
---|---|---|---|---|---|---|---|
January | 4° / -3° | 9 | 5 | 18 | 173 mm | Awful | La Chaux de Fonds in January |
February | 5° / -3° | 8 | 5 | 18 | 150 mm | Awful | La Chaux de Fonds in February |
March | 9° / 0° | 9 | 10 | 13 | 145 mm | Awful | La Chaux de Fonds in March |
April | 14° / 3° | 10 | 15 | 7 | 151 mm | Bad | La Chaux de Fonds in April |
May | 17° / 5° | 14 | 15 | 2 | 244 mm | Bad | La Chaux de Fonds in May |
June | 21° / 10° | 14 | 15 | 0 | 277 mm | Ok | La Chaux de Fonds in June |
July | 23° / 11° | 12 | 19 | 0 | 228 mm | Good | La Chaux de Fonds in July |
August | 23° / 11° | 11 | 20 | 0 | 221 mm | Good | La Chaux de Fonds in August |
September | 20° / 8° | 8 | 22 | 0 | 147 mm | Ok | La Chaux de Fonds in September |
October | 15° / 5° | 8 | 20 | 3 | 152 mm | Bad | La Chaux de Fonds in October |
November | 9° / 1° | 10 | 10 | 10 | 174 mm | Awful | La Chaux de Fonds in November |
December | 5° / -2° | 10 | 7 | 16 | 216 mm | Awful | La Chaux de Fonds in December |