Click on a day for an hourly weather forecast
The temperatures in Lake Arrowhead in September are comfortable with low of 12°C and and high up to 22°C.
You can expect about 3 to 8 days of rain in Lake Arrowhead 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 Lake Arrowhead in September 2025.
If you’re planning to visit Lake Arrowhead in the near future, we highly recommend that you review the 14 day weather forecast for Lake Arrowhead before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -9° | 8 | 17 | 6 | 94 mm | Awful | Lake Arrowhead in January |
| February | 0° / -8° | 8 | 13 | 7 | 100 mm | Awful | Lake Arrowhead in February |
| March | 5° / -4° | 7 | 18 | 5 | 102 mm | Awful | Lake Arrowhead in March |
| April | 11° / 2° | 8 | 21 | 2 | 122 mm | Awful | Lake Arrowhead in April |
| May | 18° / 8° | 8 | 23 | 0 | 87 mm | Ok | Lake Arrowhead in May |
| June | 22° / 13° | 9 | 21 | 0 | 121 mm | Ok | Lake Arrowhead in June |
| July | 26° / 17° | 10 | 21 | 0 | 119 mm | Good | Lake Arrowhead in July |
| August | 26° / 16° | 8 | 23 | 0 | 99 mm | Good | Lake Arrowhead in August |
| September | 22° / 12° | 6 | 24 | 0 | 85 mm | Good | Lake Arrowhead in September |
| October | 15° / 7° | 8 | 23 | 0 | 135 mm | Ok | Lake Arrowhead in October |
| November | 8° / 1° | 7 | 22 | 1 | 97 mm | Bad | Lake Arrowhead in November |
| December | 2° / -4° | 9 | 17 | 5 | 136 mm | Awful | Lake Arrowhead in December |