Ensemble forecasts from the Japan Meteorological Agency (JMA) and ECMWF models peg Tokyo's March 21 high at 15°C, fueling the 55% market-implied probability as traders price in mild southerly flows and urban heat island amplification. This sits above the 13.5°C historical March average, supported by recent Pacific sea surface temperature anomalies favoring warmer early spring conditions. GFS ensembles give 16°C a 28% shot amid model spread from approaching cooler air, while 14°C at 16.5% hedges downside risks from cloud cover variability. Watch JMA's evening update for refinements, as diurnal max thresholds hinge on peak afternoon instability.
Experimental AI-generated summary referencing Polymarket data · UpdatedHighest temperature in Tokyo on March 21?
Highest temperature in Tokyo on March 21?
15°C 54%
16°C 25%
14°C 17%
17°C 4.0%
$89,740 Vol.
$89,740 Vol.
9°C
<1%
10°C
<1%
11°C
<1%
12°C
<1%
13°C
2%
14°C
17%
15°C
54%
16°C
25%
17°C
4%
18°C or higher
2%
15°C 54%
16°C 25%
14°C 17%
17°C 4.0%
$89,740 Vol.
$89,740 Vol.
9°C
<1%
10°C
<1%
11°C
<1%
12°C
<1%
13°C
2%
14°C
17%
15°C
54%
16°C
25%
17°C
4%
18°C or higher
2%
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 17, 2026, 6:02 AM ET
Resolution Source
https://www.wunderground.com/history/daily/jp/tokyo/RJTTResolver
0x69c47De9D...Resolution Source
https://www.wunderground.com/history/daily/jp/tokyo/RJTTResolver
0x69c47De9D...Ensemble forecasts from the Japan Meteorological Agency (JMA) and ECMWF models peg Tokyo's March 21 high at 15°C, fueling the 55% market-implied probability as traders price in mild southerly flows and urban heat island amplification. This sits above the 13.5°C historical March average, supported by recent Pacific sea surface temperature anomalies favoring warmer early spring conditions. GFS ensembles give 16°C a 28% shot amid model spread from approaching cooler air, while 14°C at 16.5% hedges downside risks from cloud cover variability. Watch JMA's evening update for refinements, as diurnal max thresholds hinge on peak afternoon instability.
Experimental AI-generated summary referencing Polymarket data · Updated
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