Official station observations from Environment and Climate Change Canada confirmed a daily maximum of 24°C at Toronto Pearson on August 20, 2026, under partly cloudy conditions with light winds and no significant convective activity that would alter readings. This aligned precisely with the final model consensus and historical August climatology of 24–26°C, producing the market’s near-certain 100% implied probability for that outcome. Minor deviations in microclimate siting or rounding protocols at secondary stations could theoretically shift a borderline reading by 1°C, but verified data ruled out such variability here.
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?
24°C 100.0%
21°C or below <1%
22°C <1%
23°C <1%
$31,714 Vol.
$31,714 Vol.
21°C or below
No
22°C
No
23°C
No
24°C
Yes
25°C
No
26°C
No
27°C
No
28°C
No
29°C
No
30°C
No
31°C or higher
No
24°C 100.0%
21°C or below <1%
22°C <1%
23°C <1%
$31,714 Vol.
$31,714 Vol.
21°C or below
No
22°C
No
23°C
No
24°C
Yes
25°C
No
26°C
No
27°C
No
28°C
No
29°C
No
30°C
No
31°C or higher
No
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
Resolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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.
Resolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official station observations from Environment and Climate Change Canada confirmed a daily maximum of 24°C at Toronto Pearson on August 20, 2026, under partly cloudy conditions with light winds and no significant convective activity that would alter readings. This aligned precisely with the final model consensus and historical August climatology of 24–26°C, producing the market’s near-certain 100% implied probability for that outcome. Minor deviations in microclimate siting or rounding protocols at secondary stations could theoretically shift a borderline reading by 1°C, but verified data ruled out such variability here.
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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