Current forecasts from Environment Canada project a high near 25°C in Toronto on August 20 under sunny to partly cloudy skies with a 40% chance of showers and light southwesterly winds shifting westerly. This aligns with the market’s leading outcomes at 25–26°C, where trader consensus reflects short-range model agreement on modest daytime heating without strong warm advection or prolonged clear skies. Recent cooling after July’s regional heat wave has established near-normal August baselines around 24–25°C, while any afternoon convection or increased cloud cover could cap the maximum below 27°C. Updated model runs and official briefings ahead of the 24-hour window will likely refine these implied probabilities as surface observations and steering patterns evolve.
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 20?
Highest temperature in Toronto on August 20?
26°C 49%
25°C 37%
27°C 10%
24°C 6%
NEW
NEW
Aug 20, 2026
21°C or below
<1%
22°C
<1%
23°C
1%
24°C
6%
25°C
37%
26°C
49%
27°C
10%
28°C
3%
29°C
<1%
30°C
<1%
31°C or higher
<1%
26°C 49%
25°C 37%
27°C 10%
24°C 6%
NEW
NEW
Aug 20, 2026
21°C or below
$150 Vol.
<1%
22°C
$66 Vol.
<1%
23°C
$65 Vol.
1%
24°C
$159 Vol.
6%
25°C
$101 Vol.
37%
26°C
$570 Vol.
49%
27°C
$192 Vol.
10%
28°C
$70 Vol.
3%
29°C
$64 Vol.
<1%
30°C
$79 Vol.
<1%
31°C or higher
$25 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 20 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.Current forecasts from Environment Canada project a high near 25°C in Toronto on August 20 under sunny to partly cloudy skies with a 40% chance of showers and light southwesterly winds shifting westerly. This aligns with the market’s leading outcomes at 25–26°C, where trader consensus reflects short-range model agreement on modest daytime heating without strong warm advection or prolonged clear skies. Recent cooling after July’s regional heat wave has established near-normal August baselines around 24–25°C, while any afternoon convection or increased cloud cover could cap the maximum below 27°C. Updated model runs and official briefings ahead of the 24-hour window will likely refine these implied probabilities as surface observations and steering patterns evolve.
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 20 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 20 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 18, 2026, 9:55 PM ET
Volume
$1,540End Date
Aug 20, 2026Market Opened
Aug 18, 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 20 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.Current forecasts from Environment Canada project a high near 25°C in Toronto on August 20 under sunny to partly cloudy skies with a 40% chance of showers and light southwesterly winds shifting westerly. This aligns with the market’s leading outcomes at 25–26°C, where trader consensus reflects short-range model agreement on modest daytime heating without strong warm advection or prolonged clear skies. Recent cooling after July’s regional heat wave has established near-normal August baselines around 24–25°C, while any afternoon convection or increased cloud cover could cap the maximum below 27°C. Updated model runs and official briefings ahead of the 24-hour window will likely refine these implied probabilities as surface observations and steering patterns evolve.
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 20 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 20 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
$1,540End Date
Aug 20, 2026Market Opened
Aug 18, 2026, 9:55 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Current forecasts from Environment Canada project a high near 25°C in Toronto on August 20 under sunny to partly cloudy skies with a 40% chance of showers and light southwesterly winds shifting westerly. This aligns with the market’s leading outcomes at 25–26°C, where trader consensus reflects short-range model agreement on modest daytime heating without strong warm advection or prolonged clear skies. Recent cooling after July’s regional heat wave has established near-normal August baselines around 24–25°C, while any afternoon convection or increased cloud cover could cap the maximum below 27°C. Updated model runs and official briefings ahead of the 24-hour window will likely refine these implied probabilities as surface observations and steering patterns evolve.
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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