Click on a day for an hourly weather forecast
The temperatures in Longmont in September are comfortable with low of 13°C and and high up to 28°C.
The wather in Longmont in September can vary between cold and nice weather days. Expect a few rainy days but usually not more than 3.
Our weather forecast can give you a great sense of what weather to expect in Longmont in September 2024.
If you’re planning to visit Longmont in the near future, we highly recommend that you review the 14 day weather forecast for Longmont before you arrive.
Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
---|---|---|---|---|---|---|---|
January | 6° / -4° | 2 | 20 | 8 | 21 mm | Awful | Longmont in January |
February | 6° / -5° | 3 | 15 | 11 | 35 mm | Awful | Longmont in February |
March | 12° / 0° | 3 | 21 | 7 | 56 mm | Bad | Longmont in March |
April | 16° / 3° | 4 | 21 | 6 | 64 mm | Ok | Longmont in April |
May | 21° / 7° | 7 | 22 | 2 | 103 mm | Bad | Longmont in May |
June | 30° / 14° | 3 | 27 | 0 | 44 mm | Good | Longmont in June |
July | 32° / 17° | 3 | 28 | 0 | 60 mm | Good | Longmont in July |
August | 32° / 16° | 1 | 30 | 0 | 35 mm | Good | Longmont in August |
September | 28° / 13° | 2 | 28 | 0 | 35 mm | Perfect | Longmont in September |
October | 18° / 5° | 2 | 26 | 3 | 33 mm | Ok | Longmont in October |
November | 12° / 0° | 2 | 23 | 5 | 23 mm | Bad | Longmont in November |
December | 6° / -5° | 2 | 21 | 7 | 19 mm | Awful | Longmont in December |