Click on a day for an hourly weather forecast
The temperatures in Oswego in August are comfortable with low of 18°C and and high up to 27°C.
You can expect rain for roughly half of the month of August in Oswego. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Oswego in August 2025.
If you’re planning to visit Oswego in the near future, we highly recommend that you review the 14 day weather forecast for Oswego before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -2° / -8° | 5 | 11 | 15 | 84 mm | Awful | Oswego in January |
| February | 0° / -7° | 4 | 12 | 13 | 87 mm | Awful | Oswego in February |
| March | 8° / 1° | 7 | 17 | 6 | 116 mm | Awful | Oswego in March |
| April | 14° / 5° | 9 | 19 | 2 | 163 mm | Bad | Oswego in April |
| May | 21° / 12° | 10 | 21 | 0 | 207 mm | Ok | Oswego in May |
| June | 26° / 17° | 10 | 20 | 0 | 225 mm | Good | Oswego in June |
| July | 28° / 19° | 9 | 22 | 0 | 178 mm | Good | Oswego in July |
| August | 27° / 18° | 8 | 23 | 0 | 158 mm | Good | Oswego in August |
| September | 24° / 14° | 5 | 25 | 0 | 113 mm | Perfect | Oswego in September |
| October | 17° / 8° | 7 | 24 | 0 | 138 mm | Ok | Oswego in October |
| November | 9° / 2° | 6 | 21 | 3 | 81 mm | Bad | Oswego in November |
| December | 2° / -3° | 6 | 15 | 10 | 84 mm | Awful | Oswego in December |