Japan Meteorological Agency forecasts have locked in a maximum of 28°C for Tokyo on May 17 at the official Otemachi station, supported by a stable high-pressure ridge promoting southerly warm advection and intense afternoon solar heating beneath mostly clear skies. This synoptic setup has produced consistent model consensus across recent runs, aligning with May climatology where such ridges frequently deliver peak readings in this range. Trader consensus at 100% implied probability for exactly 28°C reflects the narrow uncertainty band once diurnal heating peaks. Only a significant late-day frontal passage or unexpected cloud cover could shift the observed high outside this value, though current observations show no such disruption.
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 May 17?
28°C 100.0%
20°C or below <1%
21°C <1%
22°C <1%
$87,258 Vol.
$87,258 Vol.
20°C or below
<1%
21°C
<1%
22°C
<1%
23°C
<1%
24°C
<1%
25°C
<1%
26°C
<1%
27°C
<1%
28°C
100%
29°C
<1%
30°C or higher
<1%
28°C 100.0%
20°C or below <1%
21°C <1%
22°C <1%
$87,258 Vol.
$87,258 Vol.
20°C or below
<1%
21°C
<1%
22°C
<1%
23°C
<1%
24°C
<1%
25°C
<1%
26°C
<1%
27°C
<1%
28°C
100%
29°C
<1%
30°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: May 15, 2026, 12:04 AM ET
Resolution Source
https://www.wunderground.com/history/daily/jp/tokyo/RJTTThe 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/RJTTJapan Meteorological Agency forecasts have locked in a maximum of 28°C for Tokyo on May 17 at the official Otemachi station, supported by a stable high-pressure ridge promoting southerly warm advection and intense afternoon solar heating beneath mostly clear skies. This synoptic setup has produced consistent model consensus across recent runs, aligning with May climatology where such ridges frequently deliver peak readings in this range. Trader consensus at 100% implied probability for exactly 28°C reflects the narrow uncertainty band once diurnal heating peaks. Only a significant late-day frontal passage or unexpected cloud cover could shift the observed high outside this value, though current observations show no such disruption.
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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