Environment Canada’s latest guidance projects a daytime high of 25–26 °C for Toronto on August 19 under increasing cloud cover, with showers and a thunderstorm risk developing in the afternoon. This consensus across official models reflects a humid airmass and southeasterly flow that limits full insolation, keeping maximum temperatures near or slightly above seasonal normals while capping upside potential. Trader positioning, with 26 °C at 43.5 % and 25 °C at 27.5 %, tracks this narrow forecast envelope and the modest chance of earlier clearing that could push readings a degree higher. Afternoon convection and any timing shifts in shower onset remain the primary variables that could alter the observed maximum before official verification.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Toronto on August 19?
Highest temperature in Toronto on August 19?
26°C 44%
25°C 27%
27°C 17%
24°C 17%
NEW
NEW
Aug 19, 2026
22°C or below
1%
23°C
3%
24°C
17%
25°C
27%
26°C
44%
27°C
17%
28°C
2%
29°C
1%
30°C
1%
31°C
<1%
32°C or higher
<1%
26°C 44%
25°C 27%
27°C 17%
24°C 17%
NEW
NEW
Aug 19, 2026
22°C or below
$16 Vol.
1%
23°C
$64 Vol.
3%
24°C
$21 Vol.
17%
25°C
$75 Vol.
27%
26°C
$137 Vol.
44%
27°C
$252 Vol.
17%
28°C
$50 Vol.
2%
29°C
$13 Vol.
1%
30°C
$90 Vol.
1%
31°C
$34 Vol.
<1%
32°C or higher
$125 Vol.
<1%
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 19 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Toronto Pearson Intl Airport Station, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.Environment Canada’s latest guidance projects a daytime high of 25–26 °C for Toronto on August 19 under increasing cloud cover, with showers and a thunderstorm risk developing in the afternoon. This consensus across official models reflects a humid airmass and southeasterly flow that limits full insolation, keeping maximum temperatures near or slightly above seasonal normals while capping upside potential. Trader positioning, with 26 °C at 43.5 % and 25 °C at 27.5 %, tracks this narrow forecast envelope and the modest chance of earlier clearing that could push readings a degree higher. Afternoon convection and any timing shifts in shower onset remain the primary variables that could alter the observed maximum before official verification.
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 19 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Toronto Pearson Intl Airport Station, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
This market will resolve to the temperature range that contains the highest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 19 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Toronto Pearson Intl Airport Station, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Market Opened: Aug 17, 2026, 9:55 PM ET
Volume
$876End Date
Aug 19, 2026Market Opened
Aug 17, 2026, 9:55 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 19 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Toronto Pearson Intl Airport Station, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.Environment Canada’s latest guidance projects a daytime high of 25–26 °C for Toronto on August 19 under increasing cloud cover, with showers and a thunderstorm risk developing in the afternoon. This consensus across official models reflects a humid airmass and southeasterly flow that limits full insolation, keeping maximum temperatures near or slightly above seasonal normals while capping upside potential. Trader positioning, with 26 °C at 43.5 % and 25 °C at 27.5 %, tracks this narrow forecast envelope and the modest chance of earlier clearing that could push readings a degree higher. Afternoon convection and any timing shifts in shower onset remain the primary variables that could alter the observed maximum before official verification.
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
This market will resolve to the temperature range that contains the highest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 19 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Toronto Pearson Intl Airport Station, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
This market will resolve to the temperature range that contains the highest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 19 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day for the Toronto Pearson Intl Airport Station, available here: https://www.wunderground.com/history/daily/ca/mississauga/CYYZ.
To toggle between Fahrenheit and Celsius, click the gear icon next to the search bar and switch the Temperature setting between °F and °C.
This market can not resolve until the first data point for the following date has been published on the resolution source.
The resolution source for this market measures temperatures to whole degrees Celsius (eg, 9°C). Thus, this is the level of precision that will be used when resolving the market.
Revisions to temperatures recorded within this market's timeframe will be considered until the first datapoint for the following date has been published, after which any alterations will not be considered.
Volume
$876End Date
Aug 19, 2026Market Opened
Aug 17, 2026, 9:55 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Environment Canada’s latest guidance projects a daytime high of 25–26 °C for Toronto on August 19 under increasing cloud cover, with showers and a thunderstorm risk developing in the afternoon. This consensus across official models reflects a humid airmass and southeasterly flow that limits full insolation, keeping maximum temperatures near or slightly above seasonal normals while capping upside potential. Trader positioning, with 26 °C at 43.5 % and 25 °C at 27.5 %, tracks this narrow forecast envelope and the modest chance of earlier clearing that could push readings a degree higher. Afternoon convection and any timing shifts in shower onset remain the primary variables that could alter the observed maximum before official verification.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
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