Hourly Forecast - Newmarket (York)
2 WEATHER ALERTS
RAINFALL WARNING
Rain, heavy at times is expected. The ground, already near saturation, has little ability to absorb further rainfall. What: Rain, at times heavy. Total rainfall amounts of 20 to 40 mm. Locally higher amounts are possible if thunderstorms repeatedly impact the same area. When: Wednesday afternoon through Thursday morning. Additional information: Rain advances northeastward Wednesday afternoon into Wednesday evening. With thunderstorms expected, rainfall amounts may exceed 50 mm over some areas. Rain will end from west to east Thursday morning. For information concerning flooding, please consult your local Conservation Authority or Ontario Ministry of Natural Resources office. Visit Ontario.ca/floods for the latest details. Localized flooding in low-lying areas is possible. Heavy downpours can cause flash floods and water pooling on roads. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.
- Newmarket - Georgina - Northern York Region
Regional ATOMFREEZING RAIN WARNING
Freezing rain expected Wednesday. What: Freezing rain with ice accretion of 4 to 8 mm on some surfaces. When: Wednesday morning through Wednesday evening. Additional information: This freezing rain event will not be nearly as significant as the ice storm from this past weekend. Freezing rain begins east of Lake Huron Wednesday morning before reaching central Ontario later Wednesday afternoon. Precipitation may begin as snow and ice pellets, especially over central Ontario. Easterly winds gusting 50 to 60 km/h may exacerbate any tree damage. As temperatures rise above the freezing mark, freezing rain will transition to rain over southwestern Ontario Wednesday afternoon and across central Ontario Wednesday evening. For locations over the Dundalk Highlands and Niagara Escarpment, freezing rain may linger into early Wednesday evening. Surfaces such as highways, roads, walkways and parking lots may become icy and slippery. Ice build-up may cause tree branches to break. Take extra care when walking or driving in affected areas. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to ONstorm@ec.gc.ca or post reports on X using #ONStorm.
- Newmarket - Georgina - Northern York Region
Regional ATOM| Date/Time (EDT) | Temp. (°C) | Weather Conditions | Likelihood of precip (%) | UV index | Wind (km/h) | Wind Chill |
|---|---|---|---|---|---|---|
| 1 April 2025 | ||||||
| 20:00 | 0 |  Clear | 0 | * | VR 5 | * |
| 21:00 | -1 |  A few clouds | 0 | * | VR 5 | -2 |
| 22:00 | -1 | A few clouds | 0 | * | VR 5 | -3 |
| 23:00 | -2 | A few clouds | 0 | * | VR 5 | -4 |
| 2 April 2025 | ||||||
| 00:00 | -3 | A few clouds | 0 | * | VR 5 | -5 |
| 01:00 | -3 | A few clouds | 0 | * | VR 5 | -5 |
| 02:00 | -4 | A few clouds | 0 | * | SE 20 | -10 |
| 03:00 | -4 | A few clouds | 0 | * | SE 20 | -10 |
| 04:00 | -4 | A few clouds | 0 | * | SE 20 | -10 |
| 05:00 | -4 | A few clouds | 0 | * | E 20 gusts 40 | -10 |
| 06:00 | -4 |  Partly cloudy | 0 | * | E 20 gusts 40 | -10 |
| 07:00 | -4 |  A mix of sun and cloud | 0 | * | E 20 gusts 40 | -10 |
| 08:00 | -4 |  Mainly cloudy | 0 | 1 | E 30 gusts 50 | -12 |
| 09:00 | -3 | Mainly cloudy | 20 | 2 | E 30 gusts 50 | -10 |
| 10:00 | -2 |  Cloudy | 20 | 2 | E 30 gusts 50 | -9 |
| 11:00 | -1 | Cloudy | 20 | 3 | E 30 gusts 50 | -8 |
| 12:00 | -1 |  Snow mixed with ice pellets | 100 | 1 | E 30 gusts 50 | -8 |
| 13:00 | -1 | Snow mixed with ice pellets | 100 | 1 | E 30 gusts 50 | -8 |
| 14:00 | -1 |  Freezing rain mixed with ice pellets | 100 | 1 | E 30 gusts 50 | -8 |
| 15:00 | 0 | Freezing rain mixed with ice pellets | 100 | 1 | SE 30 gusts 50 | * |
| 16:00 | 0 | Freezing rain mixed with rain | 100 | * | SE 30 gusts 50 | * |
| 17:00 | 1 | Freezing rain mixed with rain | 100 | * | SE 30 gusts 50 | * |
| 18:00 | 1 | Freezing rain mixed with rain | 100 | * | SE 30 gusts 50 | * |
| 19:00 | 1 | Freezing rain mixed with rain | 100 | * | SE 30 gusts 50 | * |
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