Official Environment Canada forecasts for Toronto on August 17 call for a high of 26°C under a mix of sun and cloud with a 40% chance of showers, establishing the primary driver behind the closely matched market-implied odds favoring 26°C at 41% over 27°C at 36.5%. Mid-August conditions feature typical seasonal moderation with light southerly flow, where variable cloud cover or scattered showers could limit afternoon heating and keep the maximum at or below the forecast value. Ensemble model spreads highlight genuine uncertainty in peak temperature tied to precipitation timing and boundary-layer moisture, consistent with historical variability around 25–27°C highs. Latest guidance and any updated runs from Environment and Climate Change Canada will refine resolution before final observations.
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 17?
Highest temperature in Toronto on August 17?
26°C 41%
27°C 37%
28°C 13%
25°C 8%
NEW
NEW
Aug 17, 2026
21°C or below
<1%
22°C
1%
23°C
1%
24°C
2%
25°C
8%
26°C
41%
27°C
37%
28°C
13%
29°C
4%
30°C
1%
31°C or higher
<1%
26°C 41%
27°C 37%
28°C 13%
25°C 8%
NEW
NEW
Aug 17, 2026
21°C or below
$101 Vol.
<1%
22°C
$159 Vol.
1%
23°C
$31 Vol.
1%
24°C
$50 Vol.
2%
25°C
$48 Vol.
8%
26°C
$143 Vol.
41%
27°C
$108 Vol.
37%
28°C
$49 Vol.
13%
29°C
$25 Vol.
4%
30°C
$50 Vol.
1%
31°C or higher
$111 Vol.
<1%
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
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 17 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.Official Environment Canada forecasts for Toronto on August 17 call for a high of 26°C under a mix of sun and cloud with a 40% chance of showers, establishing the primary driver behind the closely matched market-implied odds favoring 26°C at 41% over 27°C at 36.5%. Mid-August conditions feature typical seasonal moderation with light southerly flow, where variable cloud cover or scattered showers could limit afternoon heating and keep the maximum at or below the forecast value. Ensemble model spreads highlight genuine uncertainty in peak temperature tied to precipitation timing and boundary-layer moisture, consistent with historical variability around 25–27°C highs. Latest guidance and any updated runs from Environment and Climate Change Canada will refine resolution before final observations.
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
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 17 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.
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 17 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 15, 2026, 9:55 PM ET
Volume
$873End Date
Aug 17, 2026Market Opened
Aug 15, 2026, 9:55 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
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 17 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.Official Environment Canada forecasts for Toronto on August 17 call for a high of 26°C under a mix of sun and cloud with a 40% chance of showers, establishing the primary driver behind the closely matched market-implied odds favoring 26°C at 41% over 27°C at 36.5%. Mid-August conditions feature typical seasonal moderation with light southerly flow, where variable cloud cover or scattered showers could limit afternoon heating and keep the maximum at or below the forecast value. Ensemble model spreads highlight genuine uncertainty in peak temperature tied to precipitation timing and boundary-layer moisture, consistent with historical variability around 25–27°C highs. Latest guidance and any updated runs from Environment and Climate Change Canada will refine resolution before final observations.
This market will resolve based on the highest temperature recorded in the 'Daily Observations' table on Weather Underground, not the figure displayed in the 'Day High & Low' summary section; in the event of any discrepancy between the two, the Daily Observations table shall be the primary resolution source not the Day High & Low section.
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 17 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.
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 17 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.
Volume
$873End Date
Aug 17, 2026Market Opened
Aug 15, 2026, 9:55 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Official Environment Canada forecasts for Toronto on August 17 call for a high of 26°C under a mix of sun and cloud with a 40% chance of showers, establishing the primary driver behind the closely matched market-implied odds favoring 26°C at 41% over 27°C at 36.5%. Mid-August conditions feature typical seasonal moderation with light southerly flow, where variable cloud cover or scattered showers could limit afternoon heating and keep the maximum at or below the forecast value. Ensemble model spreads highlight genuine uncertainty in peak temperature tied to precipitation timing and boundary-layer moisture, consistent with historical variability around 25–27°C highs. Latest guidance and any updated runs from Environment and Climate Change Canada will refine resolution before final observations.
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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