Tokyo July 21 High: Market Locks In Thirty-Four Degrees

The Tokyo temperature market for July 21 is not waiting for confirmation. A 97.5% implied probability on the 34°C outcome tells you the market has already priced this as settled. What drove the story is the momentum: the 34°C contract opened at roughly a quarter of its current value and surged more than 50% in a single trading session on July 20. Here’s what the measurements are telling us: real-time weather data for Tokyo aligned hard with the 34°C band, and traders followed the thermometer.

The market question asks for the highest temperature recorded in Tokyo on July 21. The 34°C outcome trades at 0.98 YES and 0.03 NO. The contract resolves at 12:00 JST on July 21, 2026. Total volume stands at $58,016, with $50,738 of that arriving in the past 24 hours.

How the Thirty-Four Degree Contract Works

YES pays out if Tokyo’s official highest temperature on July 21 lands exactly at 34°C. NO pays out if the daily maximum registers at any other value, whether 33°C, 35°C, or any alternative outcome in the market. Resolution follows the official temperature record from the Japan Meteorological Agency’s Tokyo observation station. The contract closes at noon JST on July 21.

• 34°C YES trades at 0.98, implying a 97.5% resolution probability.
• 34°C NO trades at 0.03, implying a 2.5% probability of any other outcome.

For the NO side to pay, the Japan Meteorological Agency’s Tokyo reading must close the day at something other than 34°C. Late afternoon heat surges or an unexpected sea breeze from Tokyo Bay could push the reading to 35°C or pull it back to 33°C. Those scenarios explain the thin 2.5% NO probability. The market is not ignoring them. It is just pricing them as unlikely.

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Momentum and Market Signals Pointing One Direction

The combined momentum signal here is unusually clean. A 1-hour gain of 1.4%, a 24-hour gain of 56.0%, and a trend score of 65.89 all point the same direction at the same time. That kind of alignment typically reflects a single, high-confidence catalyst: in this case, real-time temperature readings for Tokyo on July 21 converging on the 34°C band as the trading day progressed.

Total volume at $58,016 is thin by prediction market standards. More than 87% of that volume arrived in the past 24 hours, which means traders moved fast when the data confirmed the range. Liquidity sits at $243,121, meaning the order book is deep relative to volume. That ratio tells you the market is not being moved by a single large position. It reflects broad directional agreement. When volume is below $1M, a fresh data point can still move the price sharply, so the 2.5% NO probability is not zero risk.

• The 1-hour gain of 1.4% and 24-hour gain of 56.0% reflect real-time weather data converging on 34°C, not speculative repositioning.
• The trend score of 65.89 confirms sustained directional conviction, not a spike-and-reversal pattern.
• Total volume of $58,016 is thin. Any unexpected shift in the Japan Meteorological Agency’s reading could reprice this fast.
• Liquidity of $243,121 exceeds volume by a factor of four, meaning the order book can absorb a directional shift without large price distortion.
• The strong positive correlation with the Seoul July 21 temperature market suggests regional weather patterns are driving both contracts simultaneously.

Lines Analysis: What the Japan Meteorological Agency Data Supports

The Japan Meteorological Agency’s Tokyo station is the resolution authority here, and the market is treating its intraday trajectory as the primary signal. Tokyo’s summer temperature distribution in late July clusters heavily in the 33°C to 36°C range. A reading of exactly 34°C is not a narrow target in that context. The data doesn’t care about the politics of how thin this contract’s volume is. When intraday temperatures track the mid-34°C band, the market moves to reflect that.

What makes the NO side real is precision. This market resolves on a single integer. A daily maximum of 34.4°C rounds to 34°C under standard meteorological reporting. A reading of 34.6°C or above rounds to 35°C. That rounding boundary is the primary risk. An afternoon temperature surge of less than one degree relative to current intraday highs could shift the resolution outcome entirely. The Japan Meteorological Agency publishes the official daily maximum by late evening JST.

• The Japan Meteorological Agency’s evening publication of the July 21 daily maximum is the single resolution trigger. Any delay or revision would extend uncertainty.
• A late-afternoon sea breeze from Tokyo Bay historically suppresses peak temperatures in central Tokyo by one to two degrees. If that pattern activates on July 21, it favors the NO side.
• Persistent heat dome conditions over the Kanto Plain through July 21 would push toward 35°C and reprice the 35°C contract instead.
• The strong positive correlation with the Highest Temperature in Seoul on July 21 market suggests regional synoptic conditions are the common driver. A shift in either reading would likely reprice both contracts.

Total volume of $58,016 is modest. The data currently favors the 34°C YES outcome, reflecting intraday temperature trajectories as of the trading session leading into resolution. The market is pricing uncertainty, not science. The science is weather forecasting at the one-degree resolution level, and that is genuinely uncertain even at short range.

LINES VERDICT

Strongly Favoring Resolution at Thirty-Four Degrees

The Japan Meteorological Agency’s intraday Tokyo data drove this market from 23 cents to 98 cents in a single session. That is not noise. That is real-time weather data doing its job.

What the market says: At 97.5%, the market has concluded the 34°C outcome is essentially settled. The residual 2.5% reflects rounding-boundary risk and late-afternoon temperature variability, both real but unlikely. With the contract resolving at 12:00 JST on July 21, any remaining volatility will be driven entirely by the Japan Meteorological Agency’s final daily maximum reading.

Key unknown: The Japan Meteorological Agency’s official daily maximum for Tokyo on July 21, published by late evening JST, is the only data point that matters now. A reading that rounds to 33°C or 35°C would erase the 34°C YES outcome entirely.