Recent official guidance from Environment Canada forecasts a September 23 high of 19°C in Toronto under a mix of sun and cloud with easterly winds near 20 km/h, driven by building high pressure and limited moisture. Ensemble model consensus clusters afternoon maxima between 17–19°C, with 18°C and 19°C outcomes nearly tied in trader pricing due to small uncertainties in cloud timing, boundary-layer mixing, and peak insolation. These conditions sit slightly below the 1991–2020 average high of 20.2°C, reflecting cooler northeasterly flow rather than any significant frontal system. Updated model runs and Environment Canada briefings over the next 12–18 hours will likely resolve the narrow gap between the leading probabilities.
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 September 23?
Highest temperature in Toronto on September 23?
18°C 50%
19°C 42%
17°C 8%
16°C 6%
NEW
NEW
Sep 23, 2026
12°C or below
3%
13°C
<1%
14°C
3%
15°C
5%
16°C
6%
17°C
8%
18°C
50%
19°C
42%
20°C
5%
21°C
3%
22°C or higher
4%
18°C 50%
19°C 42%
17°C 8%
16°C 6%
NEW
NEW
Sep 23, 2026
12°C or below
$10 Vol.
3%
13°C
$105 Vol.
<1%
14°C
$19 Vol.
3%
15°C
$11 Vol.
5%
16°C
$43 Vol.
6%
17°C
$63 Vol.
8%
18°C
$255 Vol.
50%
19°C
$334 Vol.
42%
20°C
$35 Vol.
5%
21°C
$78 Vol.
3%
22°C or higher
$23 Vol.
4%
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Toronto Pearson Intl Airport Station in degrees Celsius on 23 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=cyyz
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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 official guidance from Environment Canada forecasts a September 23 high of 19°C in Toronto under a mix of sun and cloud with easterly winds near 20 km/h, driven by building high pressure and limited moisture. Ensemble model consensus clusters afternoon maxima between 17–19°C, with 18°C and 19°C outcomes nearly tied in trader pricing due to small uncertainties in cloud timing, boundary-layer mixing, and peak insolation. These conditions sit slightly below the 1991–2020 average high of 20.2°C, reflecting cooler northeasterly flow rather than any significant frontal system. Updated model runs and Environment Canada briefings over the next 12–18 hours will likely resolve the narrow gap between the leading probabilities.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Toronto Pearson Intl Airport Station in degrees Celsius on 23 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=cyyz
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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 NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=cyyz
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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: Sep 21, 2026, 8:56 AM ET
Volume
$977End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=cyyzResolver
0x69c47De9D...This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Toronto Pearson Intl Airport Station in degrees Celsius on 23 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=cyyz
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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 official guidance from Environment Canada forecasts a September 23 high of 19°C in Toronto under a mix of sun and cloud with easterly winds near 20 km/h, driven by building high pressure and limited moisture. Ensemble model consensus clusters afternoon maxima between 17–19°C, with 18°C and 19°C outcomes nearly tied in trader pricing due to small uncertainties in cloud timing, boundary-layer mixing, and peak insolation. These conditions sit slightly below the 1991–2020 average high of 20.2°C, reflecting cooler northeasterly flow rather than any significant frontal system. Updated model runs and Environment Canada briefings over the next 12–18 hours will likely resolve the narrow gap between the leading probabilities.
This market will resolve to the temperature range that contains the highest temperature recorded by NOAA at the Toronto Pearson Intl Airport Station in degrees Celsius on 23 Sep '26.
The resolution source for this market will be information from NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=cyyz
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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 NOAA, specifically the highest reading under the "Temp" column for all times on this day, available here: https://www.weather.gov/wrh/timeseries?site=cyyz
If NOAA data for the observation date is unavailable by 11:59 PM ET on the day following the observation date, the Weather Underground Daily Observations table will be used as the resolution source.
In the event that there is no data for the observation date by 11:59 PM ET on the day following the observation date, this market will resolve to the lowest bracket.
To toggle between Fahrenheit and Celsius, click the "Switch to Metric Units" button until the relevant table displays °C.
This market will resolve once the first data point for the following date has been published on the resolution source, or by 11:59 PM ET on the day following the observation date, whichever comes first.
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
$977End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=cyyzResolver
0x69c47De9D...Recent official guidance from Environment Canada forecasts a September 23 high of 19°C in Toronto under a mix of sun and cloud with easterly winds near 20 km/h, driven by building high pressure and limited moisture. Ensemble model consensus clusters afternoon maxima between 17–19°C, with 18°C and 19°C outcomes nearly tied in trader pricing due to small uncertainties in cloud timing, boundary-layer mixing, and peak insolation. These conditions sit slightly below the 1991–2020 average high of 20.2°C, reflecting cooler northeasterly flow rather than any significant frontal system. Updated model runs and Environment Canada briefings over the next 12–18 hours will likely resolve the narrow gap between the leading probabilities.
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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