5-day weather forecast Niagara Falls 17-08-2026
Weather forecast Niagara Falls Monday, August 17 17.08.2026: patchy rain possible, temperature from 19 °C to 25 °C.
Precipitation probability 41%. Wind up to 5.19 m/s (gusts 6.83 m/s). Air humidity 42–93%, atmospheric pressure 758–761 mm Hg, UV index up to 6.
Weather Alerts
Hide alertsyellow watch - severe thunderstorm - in effect
thunderstorm
Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain.
What:
Wind gusts near 100 km/h.
Toonie sized hail.
Heavy rain in excess of 40 mm.
When:
This afternoon into this evening.
Additional Information:
The highest rainfall amounts are expected for areas that receive multiple thunderstorms.
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Local utility outages are possible. Fast-moving and rapidly rising water can sweep vehicles away and damage infrastructure.
Severe thunderstorm watches are issued when conditions are favourable for the development of thunderstorms capable of producing damaging hail, wind or rain.
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 social media using #ONStorm.
For more information: https://www.ontario.ca/page/be-prepared-emergency.
When thunder roars, go indoors! Lightning kills and injures Canadians every year. Secure loose objects.
Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.
squall watch in effect
squall
Conditions are favourable for the development of squalls with wind gusts up to 45 knots, frequent lightning and hail.
Thunderstorms are expected to track east over the lakes this afternoon and evening.
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Please continue to monitor alerts and forecasts issued by Environment Canada. For more information monitor Canadian Coast Guard radio or Weatheradio stations.
Mariners are advised to prepare for potential squalls. Vulnerable vessels are most at risk and should seek safe harbour if underway.
5 days at a glance — tap a day to open it
Sunrise 06:24
Sunset 20:16
Sunset 20:16
Waxing Crescent27% illuminated
Moonrise 12:10 · Moonset 22:22
Moonrise 12:10 · Moonset 22:22
Chart
TableMon, Aug 17, 2026
Forecast from 19 °C to 25 °C and precipitation
Cloud cover and precipitation probability
Wind speed and direction
Air humidity
Atmospheric pressure
Ultraviolet index
Mon, Aug 17, 2026
Niagara Falls on the map
Data Sources & Methodology
Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.