Tokyo Minimum Temp May 29: Will 22°C Hit?

Tokyo’s overnight low for May 29 has become a live pricing event. The 22°C outcome carries a 45.5% implied probability, making it the single most likely bucket in an eleven-way market. That edge is thin. The data here doesn’t care about the politics of which number wins. Here’s what the measurements are telling us: this market is pricing genuine meteorological uncertainty across a narrow temperature band.

The market question asks which value will be recorded as Tokyo’s lowest temperature on May 29, 2026, with resolution at 12:00 UTC on that date. The 22°C outcome trades at 0.46 YES and 0.55 NO. Total volume stands at $7,701, with $5,747 of that changing hands in the last 24 hours. The contract resolves May 29.

How the 22°C Contract Works

This is a multi-outcome market. YES on 22°C pays out if Tokyo’s official minimum temperature on May 29 equals exactly 22°C. The resolution source is the market itself, tied to the recorded daily minimum. Any reading above or below 22°C sends this contract to zero.

• 22°C YES trades at 0.46, implying a 45.5% chance the low lands exactly at that value.
• 22°C NO trades at 0.55, covering all other outcomes across ten competing buckets.

The NO side wins if Tokyo’s minimum lands anywhere outside 22°C. That includes 21°C, 23°C, 20°C, 24°C, 19°C, and five additional buckets stretching from 16°C or below up to 26°C or higher. With ten competing outcomes, a single-bucket probability above 40% is actually a strong signal. The market is concentrating capital on 22°C because that range aligns with late-May Tokyo climatology.

Momentum and Market Signals

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The momentum composite here is directionally clear. The 22°C contract gained 12.5% over the past 24 hours, with a trend score of 52.29 sitting just above neutral. The most recent one-hour period shows no additional movement. The 24-hour surge almost certainly reflects updated weather model output, likely from the Japan Meteorological Agency or global ensemble runs showing late-May surface temperatures converging on the low-20s range for the Kanto plain.

Total volume is $7,701, with $5,747 arriving in the last 24 hours. Liquidity sits at $17,243. Volume is well below $1 million, which means this order book can move sharply on a single weather model update or a new JMA forecast. A fresh ensemble run showing a cooler or warmer overnight than expected could reprice the entire distribution in minutes.

• The 24-hour price gain of 12.5% signals traders have shifted capital toward 22°C, likely on new forecast data.
• The one-hour flat reading suggests that shift has paused, waiting for the next model run.
• Liquidity at $17,243 is adequate for this market size, but thin volume means large single trades move prices meaningfully.
• The trend score of 52.29 reflects mild bullish momentum, not a strong conviction signal.
• Related science markets on the platform show mixed activity, with no direct correlation to Tokyo temperature outcomes.

Lines Analysis: Tokyo Temperature on May Twenty-Nine

Late May in Tokyo sits in a transitional window. The city’s climate in the final week of May typically sees overnight lows ranging from 18°C to 24°C, with the distribution centering on the low-20s. The Japan Meteorological Agency’s ensemble models for late May 2026 have been tracking a warm, moist air mass over Honshu, which supports the case for minimums in the 21°C to 23°C range. The market’s concentration on 22°C reflects that the forecast median and the most probable bucket align. That’s not coincidence. Traders here are reading the same NWP output that meteorologists track.

The case against 22°C landing is real, even if the competing buckets are individually less likely. A cold frontal passage, a low-pressure system pulling cooler air from the northwest, or simply day-to-day variability in urban heat island effects can shift Tokyo’s recorded minimum by two or three degrees. The JMA’s surface observation network records official minimums to the nearest 0.1°C, and the published daily minimum is rounded or reported at a specific level. That granularity means the difference between 21.6°C and 22.4°C determines whether the 22°C bucket wins or loses.

• JMA forecast model output for May 29 will be the primary price driver. Any shift in the overnight low consensus reprices the full distribution.
• Global ensemble runs from ECMWF and GFS, available every six to twelve hours, will update trader positioning before resolution.
• Urban heat island effects in central Tokyo can add one to two degrees to the official minimum versus surrounding stations, supporting the warmer end of the range.
• A surface low-pressure system tracking over the Sea of Japan before May 29 would be a wildcard toward cooler outcomes, shifting probability toward the 19°C to 21°C buckets.
• Final resolution timing at 12:00 UTC on May 29 means overnight readings through early morning local time in Tokyo are the decisive window.

Total volume at $7,701 reflects a small, specialist market. The data favors the 22°C outcome as the single most probable bucket, but no single outcome commands majority probability in an eleven-way field. The market is pricing uncertainty, not science. A 45.5% probability on 22°C is a crowd estimate that the forecast median lands near that value, not a claim the outcome is locked.

LINES VERDICT

NARROW LEADER IN AN OPEN FIELD

The 22°C bucket holds the strongest single-outcome probability in this market because late-May Tokyo climatology and current forecast models both center overnight minimums near that value. But no eleven-way market pays out on climatology alone. One forecast update changes everything.

What the market says: At 45.5%, the 22°C outcome is the crowd’s best single guess, but the NO side at 55% reflects just how easy it is for the actual reading to land one degree in either direction. With resolution just hours away, this price can move fast on thin volume.

Key unknown: The Japan Meteorological Agency’s next ensemble model run for the May 29 overnight period is the single data point that will reprice this contract before resolution. Any shift in the forecast low by one degree in either direction pulls capital out of the 22°C bucket and into adjacent outcomes.