Click on a day for an hourly weather forecast
The temperatures in Waterloo in May are quite cold with temperatures between 8°C and 18°C, warm clothes are a must.
You can expect rain for roughly half of the month of May in Waterloo. 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 Waterloo in May 2025.
If you’re planning to visit Waterloo in the near future, we highly recommend that you review the 14 day weather forecast for Waterloo before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -4° / -9° | 6 | 5 | 20 | 93 mm | Awful | Waterloo in January |
| February | -3° / -9° | 5 | 5 | 18 | 83 mm | Awful | Waterloo in February |
| March | 3° / -4° | 8 | 11 | 12 | 95 mm | Awful | Waterloo in March |
| April | 10° / 2° | 9 | 16 | 6 | 124 mm | Awful | Waterloo in April |
| May | 18° / 8° | 8 | 23 | 0 | 118 mm | Ok | Waterloo in May |
| June | 22° / 13° | 7 | 23 | 0 | 126 mm | Ok | Waterloo in June |
| July | 25° / 16° | 8 | 23 | 0 | 144 mm | Good | Waterloo in July |
| August | 25° / 15° | 6 | 25 | 0 | 118 mm | Perfect | Waterloo in August |
| September | 21° / 12° | 5 | 25 | 0 | 89 mm | Good | Waterloo in September |
| October | 14° / 6° | 7 | 22 | 1 | 120 mm | Ok | Waterloo in October |
| November | 6° / 0° | 7 | 14 | 9 | 81 mm | Awful | Waterloo in November |
| December | 0° / -4° | 6 | 7 | 17 | 85 mm | Awful | Waterloo in December |