Hong Kong Observatory's official measurements confirm the highest air temperature of 28°C at its headquarters on April 20, 2026, under mainly fine skies with moderate northeasterly winds, aligning with trader consensus at 100% implied probability for this outcome and driving all other brackets to near-zero. This positioning reflects precise, standardized meteorological observations from thermometers in a Stevenson screen, consistent with April climatological norms where daily highs average 26–28°C amid rising regional heat trends evidenced by record-warm Aprils in 2024 and 2025. Pre-event forecasts from HKO projected maxima around 29°C, with minimal shower risk. Realistic challenges, though improbable post-24-hour validation window, include a data audit revealing a higher reading at a remote station or rare instrument recalibration, but strong scientific consensus supports resolution to 28°C.
Experimental AI-generated summary referencing Polymarket data. This is not trading advice and plays no role in how this market resolves. · UpdatedHighest temperature in Hong Kong on April 20?
Highest temperature in Hong Kong on April 20?
28°C 100.0%
21°C or below <1%
22°C <1%
23°C <1%
$187,714 Vol.
$187,714 Vol.
Apr 20, 2026
21°C or below
No
22°C
No
23°C
No
24°C
No
25°C
No
26°C
No
27°C
No
28°C
Yes
29°C
No
30°C
No
31°C or higher
No
28°C 100.0%
21°C or below <1%
22°C <1%
23°C <1%
$187,714 Vol.
$187,714 Vol.
Apr 20, 2026
21°C or below
$7,027 Vol.
No
22°C
$4,036 Vol.
No
23°C
$3,282 Vol.
No
24°C
$3,192 Vol.
No
25°C
$6,104 Vol.
No
26°C
$21,738 Vol.
No
27°C
$27,258 Vol.
No
28°C
$53,038 Vol.
Yes
29°C
$25,431 Vol.
No
30°C
$23,488 Vol.
No
31°C or higher
$13,119 Vol.
No
This market will resolve to the temperature range that contains the highest temperature recorded by the Hong Kong Observatory in degrees Celsius on 20 Apr '26.
The resolution source for this market will be information from the Hong Kong Observatory, specifically the "Absolute Daily Max (deg. C)" the specified date once information is finalized in the relevant "Daily Extract", available here: https://www.weather.gov.hk/en/cis/climat.htm
This market can not resolve to "Yes" until data for this date has been finalized.
The resolution source for this market measures temperatures in Celsius to one decimal place (eg, 9.1°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.Hong Kong Observatory's official measurements confirm the highest air temperature of 28°C at its headquarters on April 20, 2026, under mainly fine skies with moderate northeasterly winds, aligning with trader consensus at 100% implied probability for this outcome and driving all other brackets to near-zero. This positioning reflects precise, standardized meteorological observations from thermometers in a Stevenson screen, consistent with April climatological norms where daily highs average 26–28°C amid rising regional heat trends evidenced by record-warm Aprils in 2024 and 2025. Pre-event forecasts from HKO projected maxima around 29°C, with minimal shower risk. Realistic challenges, though improbable post-24-hour validation window, include a data audit revealing a higher reading at a remote station or rare instrument recalibration, but strong scientific consensus supports resolution to 28°C.
This market will resolve to the temperature range that contains the highest temperature recorded by the Hong Kong Observatory in degrees Celsius on 20 Apr '26.
The resolution source for this market will be information from the Hong Kong Observatory, specifically the "Absolute Daily Max (deg. C)" the specified date once information is finalized in the relevant "Daily Extract", available here: https://www.weather.gov.hk/en/cis/climat.htm
This market can not resolve to "Yes" until data for this date has been finalized.
The resolution source for this market measures temperatures in Celsius to one decimal place (eg, 9.1°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
The resolution source for this market will be information from the Hong Kong Observatory, specifically the "Absolute Daily Max (deg. C)" the specified date once information is finalized in the relevant "Daily Extract", available here: https://www.weather.gov.hk/en/cis/climat.htm
This market can not resolve to "Yes" until data for this date has been finalized.
The resolution source for this market measures temperatures in Celsius to one decimal place (eg, 9.1°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Market Opened: Apr 18, 2026, 12:52 AM ET
Volume
$187,714End Date
Apr 20, 2026Market Opened
Apr 18, 2026, 12:52 AM ETResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
This market will resolve to the temperature range that contains the highest temperature recorded by the Hong Kong Observatory in degrees Celsius on 20 Apr '26.
The resolution source for this market will be information from the Hong Kong Observatory, specifically the "Absolute Daily Max (deg. C)" the specified date once information is finalized in the relevant "Daily Extract", available here: https://www.weather.gov.hk/en/cis/climat.htm
This market can not resolve to "Yes" until data for this date has been finalized.
The resolution source for this market measures temperatures in Celsius to one decimal place (eg, 9.1°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.Hong Kong Observatory's official measurements confirm the highest air temperature of 28°C at its headquarters on April 20, 2026, under mainly fine skies with moderate northeasterly winds, aligning with trader consensus at 100% implied probability for this outcome and driving all other brackets to near-zero. This positioning reflects precise, standardized meteorological observations from thermometers in a Stevenson screen, consistent with April climatological norms where daily highs average 26–28°C amid rising regional heat trends evidenced by record-warm Aprils in 2024 and 2025. Pre-event forecasts from HKO projected maxima around 29°C, with minimal shower risk. Realistic challenges, though improbable post-24-hour validation window, include a data audit revealing a higher reading at a remote station or rare instrument recalibration, but strong scientific consensus supports resolution to 28°C.
This market will resolve to the temperature range that contains the highest temperature recorded by the Hong Kong Observatory in degrees Celsius on 20 Apr '26.
The resolution source for this market will be information from the Hong Kong Observatory, specifically the "Absolute Daily Max (deg. C)" the specified date once information is finalized in the relevant "Daily Extract", available here: https://www.weather.gov.hk/en/cis/climat.htm
This market can not resolve to "Yes" until data for this date has been finalized.
The resolution source for this market measures temperatures in Celsius to one decimal place (eg, 9.1°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
The resolution source for this market will be information from the Hong Kong Observatory, specifically the "Absolute Daily Max (deg. C)" the specified date once information is finalized in the relevant "Daily Extract", available here: https://www.weather.gov.hk/en/cis/climat.htm
This market can not resolve to "Yes" until data for this date has been finalized.
The resolution source for this market measures temperatures in Celsius to one decimal place (eg, 9.1°C). Thus, this is the level of precision that will be used when resolving the market.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Volume
$187,714End Date
Apr 20, 2026Market Opened
Apr 18, 2026, 12:52 AM ETResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
Hong Kong Observatory's official measurements confirm the highest air temperature of 28°C at its headquarters on April 20, 2026, under mainly fine skies with moderate northeasterly winds, aligning with trader consensus at 100% implied probability for this outcome and driving all other brackets to near-zero. This positioning reflects precise, standardized meteorological observations from thermometers in a Stevenson screen, consistent with April climatological norms where daily highs average 26–28°C amid rising regional heat trends evidenced by record-warm Aprils in 2024 and 2025. Pre-event forecasts from HKO projected maxima around 29°C, with minimal shower risk. Realistic challenges, though improbable post-24-hour validation window, include a data audit revealing a higher reading at a remote station or rare instrument recalibration, but strong scientific consensus supports resolution to 28°C.
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