Click on a day for an hourly weather forecast
The temperatures in Gary 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 Gary 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 Gary in September 2025.
If you’re planning to visit Gary in the near future, we highly recommend that you review the 14 day weather forecast for Gary before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -1° / -7° | 9 | 17 | 5 | 60 mm | Awful | Gary in January |
| February | 1° / -6° | 8 | 16 | 5 | 68 mm | Awful | Gary in February |
| March | 7° / 0° | 8 | 20 | 3 | 94 mm | Awful | Gary in March |
| April | 13° / 5° | 9 | 21 | 0 | 131 mm | Bad | Gary in April |
| May | 19° / 11° | 10 | 20 | 0 | 151 mm | Ok | Gary in May |
| June | 24° / 17° | 10 | 20 | 0 | 161 mm | Good | Gary in June |
| July | 27° / 19° | 9 | 22 | 0 | 109 mm | Good | Gary in July |
| August | 26° / 19° | 9 | 22 | 0 | 112 mm | Good | Gary in August |
| September | 23° / 16° | 7 | 23 | 0 | 86 mm | Good | Gary in September |
| October | 16° / 9° | 9 | 22 | 0 | 114 mm | Ok | Gary in October |
| November | 9° / 3° | 6 | 24 | 0 | 64 mm | Ok | Gary in November |
| December | 3° / -2° | 8 | 21 | 2 | 66 mm | Awful | Gary in December |