Click on a day for an hourly weather forecast
The temperatures in Carlsbad in September are comfortable with low of 19°C and and high up to 26°C.
You can expect a few rainy days in Carlsbad during September, but usually the weather is comfortable in September.
Our weather forecast can give you a great sense of what weather to expect in Carlsbad in September 2025.
If you’re planning to visit Carlsbad in the near future, we highly recommend that you review the 14 day weather forecast for Carlsbad before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 19° / 12° | 2 | 29 | 0 | 37 mm | Good | Carlsbad in January |
| February | 18° / 11° | 2 | 27 | 0 | 39 mm | Good | Carlsbad in February |
| March | 18° / 12° | 1 | 30 | 0 | 26 mm | Good | Carlsbad in March |
| April | 19° / 13° | 1 | 30 | 0 | 13 mm | Good | Carlsbad in April |
| May | 20° / 14° | 0 | 31 | 0 | 14 mm | Good | Carlsbad in May |
| June | 22° / 16° | 0 | 30 | 0 | 7 mm | Good | Carlsbad in June |
| July | 24° / 18° | 1 | 30 | 0 | 26 mm | Perfect | Carlsbad in July |
| August | 25° / 19° | 1 | 30 | 0 | 14 mm | Perfect | Carlsbad in August |
| September | 26° / 19° | 1 | 29 | 0 | 14 mm | Perfect | Carlsbad in September |
| October | 24° / 17° | 1 | 30 | 0 | 12 mm | Perfect | Carlsbad in October |
| November | 21° / 15° | 1 | 29 | 0 | 24 mm | Good | Carlsbad in November |
| December | 18° / 12° | 2 | 29 | 0 | 39 mm | Good | Carlsbad in December |