Language selection

Government of Canada / Gouvernement du Canada

Search

My Weather Profile Weather Topics  | 

Alliston, ON

Current Conditions

Mainly Sunny

Mainly Sunny

18°C64°F

Wind:
S 15 km/h
S 9 mph
More details
Temperature:
18.0°C
64.4° F
Pressure:
102.2 kPa
30.2 inches
Dew point:
17.1°C
62.8°F
Visibility:
15 km
9 miles
Humidity:
95%
Date:
10:00 AM EDT Friday 17 September 2021
Observed at:
CFB Borden
Past 24 hour ConditionsPast 24 hour Conditions
Weather Radar
Satellite
Lightning
Alerts
Jet Stream
Hourly Forecast
Historical Weather

ForecastForecast issued: 5:00 AM EDT Friday 17 September 2021

Detailed ForecastForecast issued: 5:00 AM EDT Friday 17 September 2021

Chance of showers
Today
28°C82°F
Sunny this morning and early this afternoon then a mix of sun and cloud with 30 percent chance of showers this afternoon. Fog patches dissipating this morning. Wind becoming southwest 20 km/h gusting to 40 this morning then light this afternoon. High 28. Humidex 35. UV index 6 or high.
Chance of showers
Tonight
14°C57°F
Partly cloudy with 40 percent chance of showers. Low 14.
Chance of showers
Sat, 18 Sep
22°C72°F
Partly cloudy with 40 percent chance of showers early in the morning. Otherwise sunny. Wind north 20 km/h becoming light in the morning. High 22. UV index 6 or high.
Night:  Clear. Low 8.
Sunny
Sun, 19 Sep
22°C72°F
Sunny. High 22.
Night:  Clear. Low 11.
Sunny
Mon, 20 Sep
24°C75°F
Sunny. High 24.
Night:  Cloudy periods. Low 15.
Chance of showers
Tue, 21 Sep
22°C72°F
Cloudy with 60 percent chance of showers. High 22.
Night:  Cloudy with 60 percent chance of showers. Low 16.
Chance of showers
Wed, 22 Sep
22°C72°F
Cloudy with 60 percent chance of showers. High 22.
Night:  Cloudy with 60 percent chance of showers. Low 13.
Chance of showers
Thu, 23 Sep
20°C68°F
Cloudy with 60 percent chance of showers. High 20.
Normals:
Max 19°C.66°F. Min 8°C.46°F.
Sunrise:
7:01 EDT
Sunset:
19:27 EDT

Averages and extremes

12 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2021)
  • 33.4°C92.1°F
  • 2005
Lowest temperature (2004-2021)
  • 2.1°C35.8°F
  • 2020
Greatest precipitation (2011-2021)
  • 0.5 mm0.02 inches
  • 2012
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
13 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2021)
  • 33.0°C91.4°F
  • 2005
Lowest temperature (2004-2021)
  • 0.9°C33.6°F
  • 2013
Greatest precipitation (2011-2021)
  • 7.0 mm0.28 inches
  • 2014
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
14 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2021)
  • 30.4°C86.7°F
  • 2018
Lowest temperature (2004-2021)
  • -1.9°C28.6°F
  • 2013
Greatest precipitation (2011-2021)
  • 25.5 mm1.0 inches
  • 2021
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
15 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2020)
  • 30.2°C86.4°F
  • 2015
Lowest temperature (2004-2020)
  • -0.7°C30.7°F
  • 2020
Greatest precipitation (2011-2016)
  • 2.0 mm0.08 inches
  • 2011
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
16 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2019)
  • 30.7°C87.3°F
  • 2018
Lowest temperature (2004-2019)
  • -1.0°C30.2°F
  • 2013
Greatest precipitation (2011-2020)
  • 0.5 mm0.02 inches
  • 2011
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
17 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2019)
  • 29.2°C84.6°F
  • 2017
Lowest temperature (2004-2019)
  • -2.5°C27.5°F
  • 2013
Greatest precipitation (2011-2019)
  • 1.5 mm0.06 inches
  • 2016
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
18 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2018)
  • 27.6°C81.7°F
  • 2017
Lowest temperature (2004-2018)
  • -0.9°C30.4°F
  • 2011
Greatest precipitation (2011-2018)
  • 18.0 mm0.71 inches
  • 2012
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
19 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2019)
  • 26.4°C79.5°F
  • 2005
Lowest temperature (2004-2019)
  • -2.8°C27.0°F
  • 2009
Greatest precipitation (2011-2019)
  • 6.5 mm0.26 inches
  • 2011
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
20 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2019)
  • 27.6°C81.7°F
  • 2017
Lowest temperature (2004-2019)
  • -3.0°C26.6°F
  • 2009
Greatest precipitation (2011-2019)
  • 15.0 mm0.59 inches
  • 2013
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
21 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2018)
  • 32.3°C90.1°F
  • 2018
Lowest temperature (2004-2018)
  • 1.8°C35.2°F
  • 2006
Greatest precipitation (2011-2018)
  • 26.5 mm1.04 inches
  • 2013
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a
22 September
Average high
  • n/a
Average low
  • n/a
Highest temperature (2004-2019)
  • 30.7°C87.3°F
  • 2019
Lowest temperature (2004-2019)
  • 0.5°C32.9°F
  • 2006
Greatest precipitation (2011-2019)
  • 7.5 mm0.3 inches
  • 2012
Greatest rainfall
  • n/a
Greatest snowfall
  • n/a
Most snow on the ground
  • n/a
Monthly frequency of precipitation
  • n/a

Yesterday's Data
Max:
24.0 °C75.2 °F
Min:
4.0 °C39.2 °F
Total Precipitation:
0.0 mm0.00 in

Follow:

  • WeatherCAN app

Follow:

No endorsement of any products or services is expressed or implied.

Follow:

  • Get it on Google Play - Link to a resource that is not part of a Government of Canada Web site. For more information, read the Important Notices in the footer of this page.
  • Download on the App Store - Link to a resource that is not part of a Government of Canada Web site. For more information, read the Important Notices in the footer of this page.

No endorsement of any products or services is expressed or implied.

Print Instructions

City Page - Print Instructions

  1. Use the collapsible arrows at the top of each section to hide or unhide the sections that you want to print.
  2. Use your browser's print action to print the displayed content on one page. Don't forget to pick your preferred paper size.

NOTE: The print layout will differ slightly from the web page display.

Weather shortcuts


How to use
  • Add to shortcuts
    • Go to the desired page on the site, open the Weather shortcuts menu and click on the "Add to shortcuts" button
    • Page name will display in the "Add this page" window, the name can be changed by highlighting the text and entering the desired name.
    • Click on the "Save" button to add the link to the list
    • Click on the "X" button to close the panel
  • Delete a link
    • Click on the "Organize shortcuts" button
    • Select the link to delete
    • Click on the "Delete" button to remove the link from the list
    • Click on the "Close" button to save the change
  • Move a link up/down the list
    • Click on the "Organize shortcuts" button
    • Click and hold the link and move to new location in the list
    • Click on the "Close" button to save the change
  • Rename a link
    • Click on the "Organize shortcuts" button
    • Select the link to rename
    • Click on the "Rename" button and change the link name
    • Click the enter or tab key
    • Click on the "Close" button to save the change
  • Keyboard navigation
    • Use the Tab key to move to a button or link
    • Use the Enter key to click on buttons or links
    • Organize shortcuts navigation
      • Use the ↑ Up key to select the link above. If none are selected, it will select the first link
      • Use the ↓ Down key to select the link below. If none are selected, it will select the last link
      • Use the Page Up key to move a selection up in the list
      • Use the Page Down key to move a selection down in the list
  • Restore default list

    Warning: Clicking on the button below will remove all your customized links.

Customized Weather shortcuts

Save your customized list as a bookmark.

Copy/paste or click on the link below then when the page displays, you can bookmark the page using the web browser. Bookmarking your customized list will allow you to access it even if the local storage on your device is erased.

What we are doing

Weather Forecasts

Weather Alerts

Weather Resources

Feedback about this web site
Date modified: