Trader consensus on Polymarket reflects short-range forecast models from the Japan Meteorological Agency and global ensembles projecting Tokyo's highest temperature on April 20 near 22°C, driven by persistent high-pressure ridging ushering mild southerly airflows amid a warmer-than-normal spring 2026 pattern influenced by neutral ENSO conditions. The tight clustering of 21°C (24%), 22°C (34%), and 23°C (27%) stems from model spread over cloud cover variability, sea breeze moderation, and urban heat island amplification at the official Tokyo observatory—factors that could cap peaks at 21°C with overcast timing or push to 23°C under clearer skies. Recent daily highs around 20-23°C validate the mild regime, with JMA updates expected April 19 to sharpen guidance before 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 20?
Highest temperature in Tokyo on April 20?
22°C 35%
23°C 27%
21°C 25%
24°C or higher 11%
$11,216 Vol.
$11,216 Vol.
14°C or below
<1%
15°C
<1%
16°C
<1%
17°C
<1%
18°C
<1%
19°C
2%
20°C
8%
21°C
25%
22°C
35%
23°C
27%
24°C or higher
11%
22°C 35%
23°C 27%
21°C 25%
24°C or higher 11%
$11,216 Vol.
$11,216 Vol.
14°C or below
<1%
15°C
<1%
16°C
<1%
17°C
<1%
18°C
<1%
19°C
2%
20°C
8%
21°C
25%
22°C
35%
23°C
27%
24°C or higher
11%
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 18, 2026, 12:21 AM 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...Trader consensus on Polymarket reflects short-range forecast models from the Japan Meteorological Agency and global ensembles projecting Tokyo's highest temperature on April 20 near 22°C, driven by persistent high-pressure ridging ushering mild southerly airflows amid a warmer-than-normal spring 2026 pattern influenced by neutral ENSO conditions. The tight clustering of 21°C (24%), 22°C (34%), and 23°C (27%) stems from model spread over cloud cover variability, sea breeze moderation, and urban heat island amplification at the official Tokyo observatory—factors that could cap peaks at 21°C with overcast timing or push to 23°C under clearer skies. Recent daily highs around 20-23°C validate the mild regime, with JMA updates expected April 19 to sharpen guidance before 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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