Current numerical weather prediction models indicate Toronto's overnight low for August 22 will likely fall in the 16–19°C range, with closely matched market-implied odds reflecting uncertainty in cloud cover and boundary-layer conditions. Clear skies overnight enhance radiative cooling as the surface loses longwave radiation to space, favoring the lower end near 16–17°C, while increased humidity, southeasterly winds, or lingering moisture from possible thunderstorms can reduce that cooling and support readings of 18–19°C or higher. These align closely with late-August climatological averages of 15–17°C and stable consensus from Environment Canada guidance, leaving limited room for extremes outside the central cluster.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedLowest temperature in Toronto on August 22?
Lowest temperature in Toronto on August 22?
18°C 31%
19°C or higher 29%
17°C 28%
16°C 27%
NEW
NEW
Aug 22, 2026
9°C or below
1%
10°C
1%
11°C
1%
12°C
1%
13°C
1%
14°C
19%
15°C
21%
16°C
27%
17°C
28%
18°C
31%
19°C or higher
29%
18°C 31%
19°C or higher 29%
17°C 28%
16°C 27%
NEW
NEW
Aug 22, 2026
9°C or below
$32 Vol.
1%
10°C
$22 Vol.
1%
11°C
$22 Vol.
1%
12°C
$22 Vol.
1%
13°C
$22 Vol.
1%
14°C
$39 Vol.
19%
15°C
$35 Vol.
21%
16°C
$0 Vol.
27%
17°C
$0 Vol.
28%
18°C
$0 Vol.
31%
19°C or higher
$0 Vol.
29%
This market will resolve based on the lowest 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 lowest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 22 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest 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.Current numerical weather prediction models indicate Toronto's overnight low for August 22 will likely fall in the 16–19°C range, with closely matched market-implied odds reflecting uncertainty in cloud cover and boundary-layer conditions. Clear skies overnight enhance radiative cooling as the surface loses longwave radiation to space, favoring the lower end near 16–17°C, while increased humidity, southeasterly winds, or lingering moisture from possible thunderstorms can reduce that cooling and support readings of 18–19°C or higher. These align closely with late-August climatological averages of 15–17°C and stable consensus from Environment Canada guidance, leaving limited room for extremes outside the central cluster.
This market will resolve based on the lowest 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 lowest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 22 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest 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 lowest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 22 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest 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 20, 2026, 8:29 PM ET
Volume
$193End Date
Aug 22, 2026Market Opened
Aug 20, 2026, 8:29 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...This market will resolve based on the lowest 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 lowest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 22 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest 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.Current numerical weather prediction models indicate Toronto's overnight low for August 22 will likely fall in the 16–19°C range, with closely matched market-implied odds reflecting uncertainty in cloud cover and boundary-layer conditions. Clear skies overnight enhance radiative cooling as the surface loses longwave radiation to space, favoring the lower end near 16–17°C, while increased humidity, southeasterly winds, or lingering moisture from possible thunderstorms can reduce that cooling and support readings of 18–19°C or higher. These align closely with late-August climatological averages of 15–17°C and stable consensus from Environment Canada guidance, leaving limited room for extremes outside the central cluster.
This market will resolve based on the lowest 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 lowest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 22 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest 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 lowest temperature recorded at the Toronto Pearson Intl Airport Station in degrees Celsius on 22 Aug '26.
The resolution source for this market will be information from Wunderground, specifically the lowest 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
$193End Date
Aug 22, 2026Market Opened
Aug 20, 2026, 8:29 PM ETResolution Source
https://www.wunderground.com/history/daily/ca/mississauga/CYYZResolver
0x69c47De9D...Current numerical weather prediction models indicate Toronto's overnight low for August 22 will likely fall in the 16–19°C range, with closely matched market-implied odds reflecting uncertainty in cloud cover and boundary-layer conditions. Clear skies overnight enhance radiative cooling as the surface loses longwave radiation to space, favoring the lower end near 16–17°C, while increased humidity, southeasterly winds, or lingering moisture from possible thunderstorms can reduce that cooling and support readings of 18–19°C or higher. These align closely with late-August climatological averages of 15–17°C and stable consensus from Environment Canada guidance, leaving limited room for extremes outside the central cluster.
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