Click on a day for an hourly weather forecast
The temperatures in Dubuque in September are comfortable with low of 12°C and and high up to 23°C.
You can expect about 3 to 8 days of rain in Dubuque 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 Dubuque in September 2025.
If you’re planning to visit Dubuque in the near future, we highly recommend that you review the 14 day weather forecast for Dubuque before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -11° | 4 | 14 | 14 | 58 mm | Awful | Dubuque in January |
| February | -2° / -9° | 3 | 12 | 13 | 68 mm | Awful | Dubuque in February |
| March | 7° / -1° | 7 | 16 | 7 | 101 mm | Awful | Dubuque in March |
| April | 13° / 4° | 9 | 19 | 3 | 154 mm | Awful | Dubuque in April |
| May | 20° / 11° | 10 | 21 | 0 | 206 mm | Ok | Dubuque in May |
| June | 25° / 16° | 9 | 21 | 0 | 214 mm | Good | Dubuque in June |
| July | 27° / 18° | 7 | 24 | 0 | 145 mm | Good | Dubuque in July |
| August | 26° / 16° | 6 | 25 | 0 | 120 mm | Perfect | Dubuque in August |
| September | 23° / 12° | 5 | 25 | 0 | 104 mm | Perfect | Dubuque in September |
| October | 15° / 6° | 7 | 23 | 1 | 118 mm | Ok | Dubuque in October |
| November | 7° / 0° | 4 | 22 | 4 | 83 mm | Bad | Dubuque in November |
| December | 0° / -5° | 5 | 15 | 11 | 75 mm | Awful | Dubuque in December |