5-day weather forecast Niagara Falls 04-09-2026

Weather forecast Niagara Falls Friday, September 4 04.09.2026: sunny, temperature from 18 °C to 25 °C.

Precipitation probability 76%. Wind up to 2.69 m/s (gusts 4.92 m/s). Air humidity 51–98%, atmospheric pressure 758–761 mm Hg, UV index up to 6.7.

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 06:43
Sunset 19:46
Last Quarter39% illuminated
Moonrise 23:29 · Moonset 15:03
Chart
Table

Forecast from 18 °C to 25 °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)212121201918181818192123242425252524232221212121
Precipitation (mm/hr)0.940000000000000000000000.010.01

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 (%)10094000100142165666100100971001006274745100100100
Rain chance (%)76371412122812171381141313121212811148242627

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)21.52.111.691.311.891.110.891.390.890.811.52.112.692.611.811.812.392.612.612.191.891.390.89
Wind gust (m/s)3.923.924.923.311.393.811.110.923.311.441.191.922.893.813.312.422.312.813.034.114.223.691.611.14
Wind direction (°)W 270°NW 309°NNW 344°N 3°NNW 338°NW 323°NW 320°NNW 342°NNW 340°N 351°N 354°W 280°WNW 286°W 274°WSW 245°W 271°WNW 286°W 266°WSW 244°SW 227°SW 224°SW 222°SSW 211°WSW 249°

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 (%)989692888788888886776862575452515357627177808384

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)759759759759759760760760761761760761761761760759758759759759759759759759

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 Index000000000.41.22.74.566.75.34.73.11.70.70.20000

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)6.67.78.48.88.68.2887.85.85.65.86.48.210.412.514.415.415.316.318.520.720.318.6
PM10 (µg/m³)6.77.88.58.98.78.2887.85.85.65.96.48.310.412.714.615.515.516.418.720.920.518.7
Ozone (O₃) (µg/m³)534539384042434346525968789010010811511711310495857567
NO₂ (µg/m³)2023.425.324.221.719.618.918.618.11715.614.312.911.610.710.210.211.515.220.22426.127.126.1
SO₂ (µg/m³)3.94.34.64.54.24.14.24.34.75.46.26.97.47.78.18.699.298.58.187.97.4
CO (µg/m³)205215227227230238257280295295286272253230209189173172204252278261221188

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.