Hourly observations from Tokyo's Haneda Airport station—the official resolution source via Weather Underground—confirm the highest temperature on April 1, 2026, peaked at 17°C (63°F) amid mostly cloudy skies, light rain, and minimal solar heating. This aligns precisely with the Japan Meteorological Agency's early morning forecast update citing 17°C, driven by cool air masses and typical early spring steering patterns over the Kanto region, where April climatological normals hover around 16–18°C. Trader consensus at 100% reflects finalized observational data, with post-day revisions ignored per market rules; only an improbable data correction before freeze could challenge this positioning, though model consensus (GFS, ECMWF) had converged on similar values pre-event.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Tokyo on April 1?
Highest temperature in Tokyo on April 1?
17°C 100.0%
18°C <1%
19°C or higher <1%
$247,406 Vol.
$247,406 Vol.
17°C
100%
18°C
<1%
19°C or higher
<1%
17°C 100.0%
18°C <1%
19°C or higher <1%
$247,406 Vol.
$247,406 Vol.
17°C
100%
18°C
<1%
19°C or higher
<1%
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: Mar 29, 2026, 2:43 PM ET
Resolution Source
https://www.wunderground.com/history/daily/jp/tokyo/RJTTResolver
0x69c47De9D...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...Hourly observations from Tokyo's Haneda Airport station—the official resolution source via Weather Underground—confirm the highest temperature on April 1, 2026, peaked at 17°C (63°F) amid mostly cloudy skies, light rain, and minimal solar heating. This aligns precisely with the Japan Meteorological Agency's early morning forecast update citing 17°C, driven by cool air masses and typical early spring steering patterns over the Kanto region, where April climatological normals hover around 16–18°C. Trader consensus at 100% reflects finalized observational data, with post-day revisions ignored per market rules; only an improbable data correction before freeze could challenge this positioning, though model consensus (GFS, ECMWF) had converged on similar values pre-event.
Experimental AI-generated summary referencing Polymarket data · Updated
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