Click on a day for an hourly weather forecast
The temperatures in Biarritz in September are comfortable with low of 16°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Biarritz during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Biarritz in September 2025.
If you’re planning to visit Biarritz in the near future, we highly recommend that you review the 14 day weather forecast for Biarritz before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 11° / 6° | 10 | 20 | 1 | 182 mm | Bad | Biarritz in January |
| February | 12° / 7° | 9 | 18 | 1 | 151 mm | Bad | Biarritz in February |
| March | 14° / 8° | 7 | 23 | 0 | 110 mm | Ok | Biarritz in March |
| April | 16° / 9° | 7 | 23 | 0 | 111 mm | Ok | Biarritz in April |
| May | 18° / 12° | 8 | 24 | 0 | 131 mm | Ok | Biarritz in May |
| June | 21° / 15° | 7 | 23 | 0 | 136 mm | Ok | Biarritz in June |
| July | 24° / 17° | 6 | 25 | 0 | 100 mm | Perfect | Biarritz in July |
| August | 24° / 17° | 5 | 26 | 0 | 99 mm | Perfect | Biarritz in August |
| September | 23° / 16° | 5 | 25 | 0 | 90 mm | Perfect | Biarritz in September |
| October | 20° / 13° | 6 | 25 | 0 | 111 mm | Good | Biarritz in October |
| November | 15° / 10° | 10 | 20 | 0 | 209 mm | Ok | Biarritz in November |
| December | 12° / 8° | 9 | 22 | 1 | 146 mm | Bad | Biarritz in December |