Official forecasts from Environment Canada for September 23 point to mainly sunny conditions with a daytime high of 17°C and light to moderate easterly winds under a stable high-pressure ridge, supporting trader consensus around 18–19°C as the most likely daily maximum. Recent model runs show minimal shifts in this guidance over the past 48 hours, with consistent temperatures reflecting typical late-September climatology for the region and limited warm advection. The modest implied probability for 20°C or higher reflects the low likelihood of significant deviations from these patterns, while lower outcomes remain discounted absent any unexpected frontal changes. Updated Environment Canada briefings and hourly observations tomorrow morning will provide the key data for final market resolution.
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?
19°C 59%
18°C 36%
20°C 6%
17°C 2.8%
NEW
NEW
Sep 23, 2026
12°C or below
<1%
13°C
<1%
14°C
<1%
15°C
<1%
16°C
1%
17°C
3%
18°C
36%
19°C
59%
20°C
6%
21°C
<1%
22°C or higher
<1%
19°C 59%
18°C 36%
20°C 6%
17°C 2.8%
NEW
NEW
Sep 23, 2026
12°C or below
$37 Vol.
<1%
13°C
$105 Vol.
<1%
14°C
$119 Vol.
<1%
15°C
$443 Vol.
<1%
16°C
$908 Vol.
1%
17°C
$789 Vol.
3%
18°C
$3,958 Vol.
36%
19°C
$1,969 Vol.
59%
20°C
$832 Vol.
6%
21°C
$313 Vol.
<1%
22°C or higher
$265 Vol.
<1%
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.Official forecasts from Environment Canada for September 23 point to mainly sunny conditions with a daytime high of 17°C and light to moderate easterly winds under a stable high-pressure ridge, supporting trader consensus around 18–19°C as the most likely daily maximum. Recent model runs show minimal shifts in this guidance over the past 48 hours, with consistent temperatures reflecting typical late-September climatology for the region and limited warm advection. The modest implied probability for 20°C or higher reflects the low likelihood of significant deviations from these patterns, while lower outcomes remain discounted absent any unexpected frontal changes. Updated Environment Canada briefings and hourly observations tomorrow morning will provide the key data for final market resolution.
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
$9,736End 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.Official forecasts from Environment Canada for September 23 point to mainly sunny conditions with a daytime high of 17°C and light to moderate easterly winds under a stable high-pressure ridge, supporting trader consensus around 18–19°C as the most likely daily maximum. Recent model runs show minimal shifts in this guidance over the past 48 hours, with consistent temperatures reflecting typical late-September climatology for the region and limited warm advection. The modest implied probability for 20°C or higher reflects the low likelihood of significant deviations from these patterns, while lower outcomes remain discounted absent any unexpected frontal changes. Updated Environment Canada briefings and hourly observations tomorrow morning will provide the key data for final market resolution.
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
$9,736End Date
Sep 23, 2026Market Opened
Sep 21, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=cyyzResolver
0x69c47De9D...Official forecasts from Environment Canada for September 23 point to mainly sunny conditions with a daytime high of 17°C and light to moderate easterly winds under a stable high-pressure ridge, supporting trader consensus around 18–19°C as the most likely daily maximum. Recent model runs show minimal shifts in this guidance over the past 48 hours, with consistent temperatures reflecting typical late-September climatology for the region and limited warm advection. The modest implied probability for 20°C or higher reflects the low likelihood of significant deviations from these patterns, while lower outcomes remain discounted absent any unexpected frontal changes. Updated Environment Canada briefings and hourly observations tomorrow morning will provide the key data for final market resolution.
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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