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

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ModerateSep 2, 04:06 AMSep 2, 08:06 PMTranslate with Google
yellow 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. ### 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.
ModerateSep 1, 08:29 PMSep 2, 12:29 PMTranslate with Google
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. ### 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.
ModerateSep 2, 04:07 AMSep 2, 12:01 PMTranslate with Google
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.
ModerateSep 2, 06:45 AMSep 2, 12:01 PMTranslate with Google
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.
Sunrise 06:42
Sunset 19:48
Last Quarter50% illuminated
Moonrise 22:40 · Moonset 13:52
Chart
Table

Forecast from 21 °C to 27 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)212222222221212121222324262727272725242323232221
Precipitation (mm/hr)4.760.840.1600000000000.0100.010.080.1100.040.0501.050.75

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)1001007610010010010010010010017691001005688558410094100100100100
Rain chance (%)91744143434343434230111316178131726232834317772

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)3.893.3132.111.61222.111.892.311.692.112.813.1933.113.53.813.192.112.391.813.113
Wind gust (m/s)8.539.57.4242.425.223.6155.034.533.223.614.424.924.815.424.815.55.424.615.725.037.55.92
Wind direction (°)SE 143°S 190°SW 222°SW 222°WSW 249°WNW 297°W 278°WNW 295°WNW 285°WNW 302°W 277°W 263°WSW 251°WSW 255°WSW 256°WSW 251°SW 231°SW 221°SW 220°SW 219°SW 228°WSW 238°WSW 244°SW 226°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)979798989999999997918372676462616575798489929798

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)759758758758759759759760760761761761761760760760759760759758759760760759

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index000000000.41.22.74.66.176.45.33.71.70.50.10000

Air quality & pollen

Air quality
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
PM2.5 (µg/m³)77.37.68.59.310.21111.21110.19.49.39.210.110.411.211.811.29.78.36.55.65.45.5
PM10 (µg/m³)7.17.47.78.69.410.311.111.411.110.29.59.59.310.210.511.311.911.49.88.56.75.85.55.6
Ozone (O₃) (µg/m³)9592878173665850495976911041151231281291251139682736761
NO₂ (µg/m³)11.711.812.112.613.314.115.416.917.215.512.6107.75.74.64.96.18.111.315.21818.317.417.5
SO₂ (µg/m³)2.933.23.53.73.93.83.63.53.53.63.63.22.72.42.42.72.933.23.33.33.43.5
CO (µg/m³)172159148139133132140153163163160170204252298330359405505621662557376241

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.