The market-implied 100% probability for a highest temperature of 17°C in Tokyo reflects confirmed Japan Meteorological Agency (JMA) observations from official stations, including Haneda Airport, where surface measurements peaked at 17°C during midday hours amid partly cloudy skies and light winds that capped diurnal heating below the climatological April average of about 20°C. Cooler conditions stemmed from a lingering high-pressure ridge with increased cloud cover reducing solar insolation, diverging slightly from earlier model forecasts around 18°C from ECMWF and GFS ensembles. As sunset approaches around 18:20 JST and temperatures drop into the evening, realistic challenges would require an anomalous late-afternoon heat burst or data revision from peripheral Tokyo stations, though JMA final daily summaries—typically issued post-midnight—hold authoritative weight for 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 Tokyo on April 17?
Highest temperature in Tokyo on April 17?
17°C 100.0%
12°C or below <1%
13°C <1%
14°C <1%
$168,078 Vol.
$168,078 Vol.
12°C or below
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
Yes
18°C
No
19°C
No
20°C
No
21°C
No
22°C or higher
No
17°C 100.0%
12°C or below <1%
13°C <1%
14°C <1%
$168,078 Vol.
$168,078 Vol.
12°C or below
No
13°C
No
14°C
No
15°C
No
16°C
No
17°C
Yes
18°C
No
19°C
No
20°C
No
21°C
No
22°C or higher
No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Tokyo Haneda Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/jp/tokyo/RJTT.
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 to "Yes" until all data for this date has been finalized.
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.
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 15, 2026, 12:06 AM ET
Resolution Source
https://www.wunderground.com/history/daily/jp/tokyo/RJTTResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The resolution source for this market will be information from Wunderground, specifically the highest temperature recorded for all times on this day by the Forecast for the Tokyo Haneda Airport Station once information is finalized, available here: https://www.wunderground.com/history/daily/jp/tokyo/RJTT.
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 to "Yes" until all data for this date has been finalized.
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.
Any revisions to temperatures recorded after data is finalized for this market's timeframe will not be considered for this market's resolution.
Resolution Source
https://www.wunderground.com/history/daily/jp/tokyo/RJTTResolver
0x69c47De9D...Outcome proposed: No
No dispute
Final outcome: No
The market-implied 100% probability for a highest temperature of 17°C in Tokyo reflects confirmed Japan Meteorological Agency (JMA) observations from official stations, including Haneda Airport, where surface measurements peaked at 17°C during midday hours amid partly cloudy skies and light winds that capped diurnal heating below the climatological April average of about 20°C. Cooler conditions stemmed from a lingering high-pressure ridge with increased cloud cover reducing solar insolation, diverging slightly from earlier model forecasts around 18°C from ECMWF and GFS ensembles. As sunset approaches around 18:20 JST and temperatures drop into the evening, realistic challenges would require an anomalous late-afternoon heat burst or data revision from peripheral Tokyo stations, though JMA final daily summaries—typically issued post-midnight—hold authoritative weight for 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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