Recent forecasts from Environment Canada and long-range models point to a brief calm period around June 19 with partly sunny skies and moderating lake breezes from the cooler Great Lakes, keeping Toronto’s daily high near the seasonal 23°C average. Trader consensus clusters tightly on 22–24°C because atmospheric guidance shows weak high pressure yielding limited daytime heating, possible scattered cloud reducing insolation, and variable boundary-layer moisture. Slight model differences in steering flow or timing of any weak frontal passage could shift the peak by 1–2°C, while stronger ridging would favor the lower-probability 25–26°C outcomes. Updated model runs and official Environment Canada guidance on June 18–19 will clarify the final range.
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 June 19?
Highest temperature in Toronto on June 19?
22°C 100.0%
17°C or below <1%
18°C <1%
19°C <1%
$42,378 Vol.
$42,378 Vol.
Jun 19, 2026
17°C or below
No
18°C
No
19°C
No
20°C
No
21°C
No
22°C
Yes
23°C
No
24°C
No
25°C
No
26°C
No
27°C or higher
No
22°C 100.0%
17°C or below <1%
18°C <1%
19°C <1%
$42,378 Vol.
$42,378 Vol.
Jun 19, 2026
17°C or below
$337 Vol.
No
18°C
$216 Vol.
No
19°C
$2,594 Vol.
No
20°C
$2,469 Vol.
No
21°C
$8,454 Vol.
No
22°C
$10,265 Vol.
Yes
23°C
$6,622 Vol.
No
24°C
$5,515 Vol.
No
25°C
$3,388 Vol.
No
26°C
$1,240 Vol.
No
27°C or higher
$1,278 Vol.
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 19 Jun '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.Recent forecasts from Environment Canada and long-range models point to a brief calm period around June 19 with partly sunny skies and moderating lake breezes from the cooler Great Lakes, keeping Toronto’s daily high near the seasonal 23°C average. Trader consensus clusters tightly on 22–24°C because atmospheric guidance shows weak high pressure yielding limited daytime heating, possible scattered cloud reducing insolation, and variable boundary-layer moisture. Slight model differences in steering flow or timing of any weak frontal passage could shift the peak by 1–2°C, while stronger ridging would favor the lower-probability 25–26°C outcomes. Updated model runs and official Environment Canada guidance on June 18–19 will clarify the final range.
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 Jun '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.
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: Jun 17, 2026, 9:03 PM ET
Volume
$42,378End Date
Jun 19, 2026Market Opened
Jun 17, 2026, 9:03 PM ETResolution 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 19 Jun '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.Recent forecasts from Environment Canada and long-range models point to a brief calm period around June 19 with partly sunny skies and moderating lake breezes from the cooler Great Lakes, keeping Toronto’s daily high near the seasonal 23°C average. Trader consensus clusters tightly on 22–24°C because atmospheric guidance shows weak high pressure yielding limited daytime heating, possible scattered cloud reducing insolation, and variable boundary-layer moisture. Slight model differences in steering flow or timing of any weak frontal passage could shift the peak by 1–2°C, while stronger ridging would favor the lower-probability 25–26°C outcomes. Updated model runs and official Environment Canada guidance on June 18–19 will clarify the final range.
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 Jun '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.
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
$42,378End Date
Jun 19, 2026Market Opened
Jun 17, 2026, 9:03 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Recent forecasts from Environment Canada and long-range models point to a brief calm period around June 19 with partly sunny skies and moderating lake breezes from the cooler Great Lakes, keeping Toronto’s daily high near the seasonal 23°C average. Trader consensus clusters tightly on 22–24°C because atmospheric guidance shows weak high pressure yielding limited daytime heating, possible scattered cloud reducing insolation, and variable boundary-layer moisture. Slight model differences in steering flow or timing of any weak frontal passage could shift the peak by 1–2°C, while stronger ridging would favor the lower-probability 25–26°C outcomes. Updated model runs and official Environment Canada guidance on June 18–19 will clarify the final range.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · Updated
Beware of external links.
Beware of external links.
Frequently Asked Questions