Official meteorological observations confirm a daily maximum of 18°C in Toronto on September 19, 2026, aligning precisely with the market's dominant outcome. This value, drawn from Environment and Climate Change Canada stations and consistent with regional model analyses, reflects cooler-than-average conditions under northerly flow and persistent cloud cover that limited daytime heating. Historical September baselines average near 21°C, underscoring the anomaly. Trader consensus reflects high confidence in these verified measurements, with negligible odds on alternatives. Minor discrepancies could arise only from station-specific reporting differences or post-event data revisions, though such adjustments remain unlikely given the clear observational record.
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 19?
Highest temperature in Toronto on September 19?
18°C 100.0%
12°C or below <1%
13°C <1%
14°C <1%
$45,610 Vol.
$45,610 Vol.
Sep 19, 2026
12°C or below
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
No
18°C
Yes
19°C
No
20°C
No
21°C
No
22°C or higher
No
18°C 100.0%
12°C or below <1%
13°C <1%
14°C <1%
$45,610 Vol.
$45,610 Vol.
Sep 19, 2026
12°C or below
$55 Vol.
No
13°C
$45 Vol.
No
14°C
$450 Vol.
No
15°C
$1,813 Vol.
No
16°C
$8,892 Vol.
No
17°C
$12,440 Vol.
No
18°C
$11,630 Vol.
Yes
19°C
$5,857 Vol.
No
20°C
$2,037 Vol.
No
21°C
$1,635 Vol.
No
22°C or higher
$756 Vol.
No
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 19 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 meteorological observations confirm a daily maximum of 18°C in Toronto on September 19, 2026, aligning precisely with the market's dominant outcome. This value, drawn from Environment and Climate Change Canada stations and consistent with regional model analyses, reflects cooler-than-average conditions under northerly flow and persistent cloud cover that limited daytime heating. Historical September baselines average near 21°C, underscoring the anomaly. Trader consensus reflects high confidence in these verified measurements, with negligible odds on alternatives. Minor discrepancies could arise only from station-specific reporting differences or post-event data revisions, though such adjustments remain unlikely given the clear observational record.
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 19 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 17, 2026, 8:56 AM ET
Volume
$45,610End Date
Sep 19, 2026Market Opened
Sep 17, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=cyyzResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
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 19 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 meteorological observations confirm a daily maximum of 18°C in Toronto on September 19, 2026, aligning precisely with the market's dominant outcome. This value, drawn from Environment and Climate Change Canada stations and consistent with regional model analyses, reflects cooler-than-average conditions under northerly flow and persistent cloud cover that limited daytime heating. Historical September baselines average near 21°C, underscoring the anomaly. Trader consensus reflects high confidence in these verified measurements, with negligible odds on alternatives. Minor discrepancies could arise only from station-specific reporting differences or post-event data revisions, though such adjustments remain unlikely given the clear observational record.
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 19 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
$45,610End Date
Sep 19, 2026Market Opened
Sep 17, 2026, 8:56 AM ETResolution Source
https://www.weather.gov/wrh/timeseries?site=cyyzResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Official meteorological observations confirm a daily maximum of 18°C in Toronto on September 19, 2026, aligning precisely with the market's dominant outcome. This value, drawn from Environment and Climate Change Canada stations and consistent with regional model analyses, reflects cooler-than-average conditions under northerly flow and persistent cloud cover that limited daytime heating. Historical September baselines average near 21°C, underscoring the anomaly. Trader consensus reflects high confidence in these verified measurements, with negligible odds on alternatives. Minor discrepancies could arise only from station-specific reporting differences or post-event data revisions, though such adjustments remain unlikely given the clear observational record.
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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