5-day weather forecast Niagara Falls 03-09-2026
Weather forecast Niagara Falls tomorrow 03.09.2026: patchy rain possible, temperature from 21 °C to 27 °C.
Precipitation probability 91%. Wind up to 3.89 m/s (gusts 9.5 m/s). Air humidity 61–99%, atmospheric pressure 758–761 mm Hg, UV index up to 7.
Weather Alerts
Hide alertsyellow warning - heat - in effect
heat
A heat event continues today.
What:
Maximum temperatures of 30 to 32 degrees Celsius.
Minimum temperatures of 20 to 23 degrees Celsius.
Maximum humidex values near 40.
When:
Continuing through today, possibly lasting into Thursday for extreme southwestern Ontario.
Additional information:
The heat event may continue into Thursday for Windsor and Essex County, however, confidence is low.
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For more information:
https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/how-protect-yourself.html
https://www.canada.ca/en/health-canada/services/climate-change-health/extreme-heat/who-is-at-risk.html
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.
Take action to protect yourself and others – extreme heat can affect everyone’s health. Determine if you or others around you are at greater risk of heat illness. Check on older adults, those living alone and other at-risk people in-person or on the phone multiple times a day.
Watch for the early signs of heat exhaustion in yourself and others. Signs may include headache, nausea, dizziness, thirst, dark urine and intense fatigue. Stop your activity and drink water.
Heat stroke is a medical emergency! Call 9-1-1 or your emergency health provider if you, or someone around you, is showing signs of heat stroke which can include red and hot skin, dizziness, nausea, confusion and change in consciousness. While you wait for medical attention, try to cool the person by moving them to a cool place, removing extra clothing, applying cold water or ice packs around the body.
Drink water often and before you feel thirsty to replace fluids.
Close blinds, or shades and open windows if outside is cooler than inside.
Turn on air conditioning, use a fan, or move to a cooler area of your living space. If your living space is hot, move to a cool public space such as a cooling centre, community centre, library or shaded park.
Follow the advice of your region’s public health authority.
Plan and schedule outdoor activities during the coolest parts of the day.
Limit direct exposure to the sun and heat. Wear lightweight, light-coloured, loose-fitting clothing and a wide-brimmed hat.
Never leave people, especially children, or pets inside a parked vehicle. Check the vehicle before locking to make sure no one is left behind.
yellow advisory - fog - in effect
fog
Near-zero visibility in fog is expected.
Visibility along the shore of Lake Ontario is reduced in dense fog. The visibility should improve Wednesday morning as the fog dissipates.
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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.
Be prepared for areas of near-zero visibility and allow extra time to reach your destination.
yellow advisory - fog - in effect
fog
Near-zero visibility in fog is expected over some areas.
Visibility should improve this morning as the fog dissipates.
###
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.
Be prepared for areas of near-zero visibility and allow extra time to reach your destination.
yellow advisory - fog - in effect
fog
Near-zero visibility in fog is expected over some areas.
Visibility should improve this morning as the fog dissipates.
###
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.
Be prepared for areas of near-zero visibility and allow extra time to reach your destination.
5 days at a glance — tap a day to open it
Sunrise 06:42
Sunset 19:48
Sunset 19:48
Last Quarter50% illuminated
Moonrise 22:40 · Moonset 13:52
Moonrise 22:40 · Moonset 13:52
Chart
Table
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Moderate or heavy rain shower | 21 °C | 91% (4.76 mm/hr) | 100% | 97% | 759 mm Hg | SE 143° 3.89 (8.53) m/s | 0 |
| 01:00 |  Light rain shower | 22 °C | 74% (0.84 mm/hr) | 100% | 97% | 758 mm Hg | S 190° 3.31 (9.5) m/s | 0 |
| 02:00 |  Patchy light rain with thunder | 22 °C | 41% (0.16 mm/hr) | 76% | 98% | 758 mm Hg | SW 222° 3 (7.42) m/s | 0 |
| 03:00 |  Fog | 22 °C | 43% | 100% | 98% | 758 mm Hg | SW 222° 2.11 (4) m/s | 0 |
| 04:00 | Fog | 22 °C | 43% | 100% | 99% | 759 mm Hg | WSW 249° 1.61 (2.42) m/s | 0 |
| 05:00 | Fog | 21 °C | 43% | 100% | 99% | 759 mm Hg | WNW 297° 2 (5.22) m/s | 0 |
| 06:00 | Fog | 21 °C | 43% | 100% | 99% | 759 mm Hg | W 278° 2 (3.61) m/s | 0 |
| 07:00 |  Fog | 21 °C | 43% | 100% | 99% | 760 mm Hg | WNW 295° 2.11 (5) m/s | 0 |
| 08:00 | Fog | 21 °C | 42% | 100% | 97% | 760 mm Hg | WNW 285° 1.89 (5.03) m/s | 0.4 |
| 09:00 |  Overcast | 22 °C | 30% | 100% | 91% | 761 mm Hg | WNW 302° 2.31 (4.53) m/s | 1.2 |
| 10:00 |  Sunny | 23 °C | 11% | 17% | 83% | 761 mm Hg | W 277° 1.69 (3.22) m/s | 2.7 |
| 11:00 |  Cloudy | 24 °C | 13% | 69% | 72% | 761 mm Hg | W 263° 2.11 (3.61) m/s | 4.6 |
| 12:00 | Overcast | 26 °C | 16% | 100% | 67% | 761 mm Hg | WSW 251° 2.81 (4.42) m/s | 6.1 |
| 13:00 |  Patchy rain possible | 27 °C | 17% (0.01 mm/hr) | 100% | 64% | 760 mm Hg | WSW 255° 3.19 (4.92) m/s | 7 |
| 14:00 |  Partly cloudy | 27 °C | 8% | 56% | 62% | 760 mm Hg | WSW 256° 3 (4.81) m/s | 6.4 |
| 15:00 | Patchy rain possible | 27 °C | 13% (0.01 mm/hr) | 88% | 61% | 760 mm Hg | WSW 251° 3.11 (5.42) m/s | 5.3 |
| 16:00 | Patchy rain possible | 27 °C | 17% (0.08 mm/hr) | 55% | 65% | 759 mm Hg | SW 231° 3.5 (4.81) m/s | 3.7 |
| 17:00 | Patchy rain possible | 25 °C | 26% (0.11 mm/hr) | 84% | 75% | 760 mm Hg | SW 221° 3.81 (5.5) m/s | 1.7 |
| 18:00 | Overcast | 24 °C | 23% | 100% | 79% | 759 mm Hg | SW 220° 3.19 (5.42) m/s | 0.5 |
| 19:00 | Patchy rain possible | 23 °C | 28% (0.04 mm/hr) | 94% | 84% | 758 mm Hg | SW 219° 2.11 (4.61) m/s | 0.1 |
| 20:00 |  Patchy rain possible | 23 °C | 34% (0.05 mm/hr) | 100% | 89% | 759 mm Hg | SW 228° 2.39 (5.72) m/s | 0 |
| 21:00 |  Overcast | 23 °C | 31% | 100% | 92% | 760 mm Hg | WSW 238° 1.81 (5.03) m/s | 0 |
| 22:00 | Light rain shower | 22 °C | 77% (1.05 mm/hr) | 100% | 97% | 760 mm Hg | WSW 244° 3.11 (7.5) m/s | 0 |
| 23:00 | Light rain shower | 21 °C | 72% (0.75 mm/hr) | 100% | 98% | 759 mm Hg | SW 226° 3 (5.92) m/s | 0 |
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.