Sault Ste. Marie is facing an unsettled stretch of weather into Sunday and beyond as a cloudy, humid airmass brings periods of rain, a risk of thunderstorms and gusty winds.
Current conditions and immediate expectations
As of early Sunday morning the official observation showed a temperature of 20.7°C, with a dewpoint near 17.3°C and humidity around 81%. Barometric pressure was measured at 101.2 kPa and visibility extended to roughly 32 km. Winds were light from the southeast at about 4 km/h.
The forecast calls for cloudy skies and a 40 percent chance of showers early this morning, with showers likely to continue into the day before diminishing this afternoon. Meteorologists have flagged a risk of thunderstorms in association with the precipitation. Total rainfall amounts through the day are expected in the 15 to 25 mm range where showers are more persistent.
Wind, humidex and visibility impacts
Winds will shift to the northwest near noon and strengthen to about 20 km/h with gusts up to 40 km/h. Those gusts can reduce visibility in heavier downpours and create tricky conditions for small craft on local waterways, and for high-profile vehicles on exposed roadways.
The combination of warm air and elevated humidity will produce a daytime humidex value near 31, making it feel noticeably muggy. The UV index is expected to be moderate (about 3) for those who find opportunities for brief sun between the cloud bands.
What to expect tonight and into the week
Tonight will remain cloudy with a continued 40 percent chance of showers through the evening. Fog patches are likely to develop overnight as winds ease late, with a low near 14°C. Monday should be mainly cloudy with fog dissipating in the morning and clearing into the afternoon; the high is forecast near 23°C.
Looking further ahead, the pattern stays unsettled:
- Tuesday: Cloudy with about a 60 percent chance of showers and a high near 22°C.
- Wednesday: A mix of sun and cloud with a lesser chance of showers and a high near 22°C.
- Thursday–Saturday: Temperatures around the low 20s Celsius with periodic cloud and occasional shower chances.
| Time frame | Condition | Temp (°C) |
|---|---|---|
| Today (Sunday) | Cloudy, showers, thunder risk | High 23 |
| Tonight | Cloudy, fog developing | Low 14 |
| Monday | Mainly cloudy, clearing | High 23 |
Practical tips and hazards to watch
The most immediate concerns are localized heavy downpours producing the forecast 15–25 mm of rain, gusty northwest winds up to 40 km/h, and patchy fog overnight into Monday morning. Those conditions can cause:
- reduced visibility on roads and at airports;
- slick surfaces and brief urban flooding where drainage is poor;
- hazardous driving for high-sided vehicles during wind gusts.
Residents and visitors should plan for wet pockets and the possibility of thunder through the day. Keep an umbrella or rain jacket handy, allow extra travel time if driving, and monitor local updates from Environment Canada for any changes or advisories.
Normal climatological values for this time of year in the area are a low near 11°C and a high near 23°C; the upcoming temperatures will be close to seasonal norms but feel warmer because of the humidity.
Forecast details are based on Environment Canada data; conditions can change quickly in unstable airmasses, so check for updates if you have outdoor plans.
