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The temperatures in Oshawa in October are quite cold with temperatures between 8°C and 14°C, warm clothes are a must.
You can expect rain for roughly half of the month of October in Oshawa. 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.
Please note that Oshawa can expect a few days of snow in October.
Our weather forecast can give you a great sense of what weather to expect in Oshawa in October 2025.
If you’re planning to visit Oshawa in the near future, we highly recommend that you review the 14 day weather forecast for Oshawa before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -3° / -9° | 7 | 5 | 19 | 94 mm | Awful | Oshawa in January |
| February | -3° / -8° | 6 | 5 | 17 | 85 mm | Awful | Oshawa in February |
| March | 3° / -3° | 7 | 13 | 11 | 92 mm | Awful | Oshawa in March |
| April | 9° / 2° | 9 | 16 | 5 | 129 mm | Awful | Oshawa in April |
| May | 16° / 8° | 7 | 24 | 0 | 134 mm | Ok | Oshawa in May |
| June | 21° / 13° | 8 | 22 | 0 | 154 mm | Ok | Oshawa in June |
| July | 25° / 17° | 8 | 23 | 0 | 160 mm | Good | Oshawa in July |
| August | 24° / 17° | 7 | 24 | 0 | 154 mm | Good | Oshawa in August |
| September | 21° / 14° | 6 | 24 | 0 | 117 mm | Good | Oshawa in September |
| October | 14° / 8° | 8 | 22 | 1 | 126 mm | Ok | Oshawa in October |
| November | 7° / 2° | 8 | 15 | 7 | 81 mm | Awful | Oshawa in November |
| December | 1° / -3° | 9 | 8 | 14 | 87 mm | Awful | Oshawa in December |