Tokyo July 9 High Temp: Can 29°C Hit at 31.5%?

Tokyo’s weather on July 9 is already a tradeable question, and the market has landed on a clear lean. The 29°C outcome sits at 31.5% implied probability, making it the single most-traded temperature band in this multi-outcome contract. But with eleven possible buckets from 23°C-or-below all the way to 33°C-or-higher, 31.5% for any single outcome is actually a strong signal of trader conviction.

The market question asks: what will the highest temperature in Tokyo be on July 9? The 29°C outcome carries a YES price of 0.32 and a NO price of 0.69. The contract resolves on July 9, 2026 at 12:00 UTC. Total volume stands at $8,757, with 24-hour volume of $8,767, meaning nearly all activity is concentrated in the most recent trading window.

How the Tokyo July 9 Temperature Contract Works

This contract resolves YES if Tokyo’s official daily high temperature on July 9, 2026 reaches exactly 29°C and no higher. Resolution follows official meteorological observation. A reading of 28°C or below, or 30°C or above, closes this specific contract at zero.

• YES (29°C): priced at 0.32, implying a 31.5% probability that Tokyo’s July 9 high lands at exactly this level.
• NO: priced at 0.69, implying a 68.5% probability that the daily high falls on any other temperature band.

The NO outcome pays out across a wide range of possibilities. Tokyo’s July 9 high must land outside the 29°C band entirely. The Japan Meteorological Agency records daily high temperatures at the Tokyo Observatory in Chiyoda. If that reading comes in at 28°C, 30°C, or any other value, this contract closes worthless for YES holders. The spread across eleven competing outcomes means NO carries structural strength in any multi-band temperature market.

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Momentum and Market Signals for Tokyo’s July Nine High

The momentum composite here is a one-day story. The 1-hour price change of +1.5% combined with a trend score of 39.25 points to fresh buying interest in the 29°C band, almost certainly driven by updated forecast models or ensemble weather data released in the past 24 hours. The 24-hour price change data is unavailable, but the full-day volume of $8,767 against a 30-day context shows this contract lit up almost entirely today.

Liquidity at $71,944 is healthy relative to total volume of $8,757. That ratio means the order book can absorb meaningful new positions without severe price distortion. However, total volume below $10,000 means this market remains thin. A single large trade could reprice the 29°C outcome by several percentage points before resolution.

• The 1-hour move of +1.5% in the 29°C outcome suggests fresh forecast data is pointing toward that temperature band, not just noise.
• Trend score of 39.25 sits below the neutral midpoint, meaning the market’s overall momentum is cautious, not euphoric.
• Total volume of $8,757 is thin. Price can shift sharply on any new meteorological data before the July 9 close.
• Liquidity of $71,944 provides a reasonable buffer, but this is not a deep market by Polymarket standards.
• Trader sentiment reads as strongly bearish on 29°C specifically, with 68.5% of implied probability sitting across all other outcomes.

Lines Analysis: Tokyo Temperature on July Nine

Early July is Tokyo’s rainy season transition period, when the city often sits between the tail of the Baiu front and the onset of full summer heat. The Japan Meteorological Agency’s historical data for early July shows Tokyo’s average daily high near 29 to 31°C in a normal year. The 29°C outcome is climatologically plausible. The fresh buying in the past hour suggests current ensemble models are converging on that band.

The barrier for the NO outcome is straightforward: any deviation from exactly 29°C sends this contract to zero. Tokyo’s July highs are volatile on a day-to-day basis. A cloud cover shift, a residual Baiu front, or an early Pacific high pushing northward can move the daily maximum by 2 to 3°C in either direction. The JMA forecast for July 9 is the single most important input, and it has not yet fully resolved into a stable prediction.

• JMA’s 48-hour and 72-hour forecast updates are the primary price drivers. Any shift toward 30°C or above represses the 29°C YES price immediately.
• Ensemble model agreement, particularly from the European Centre for Medium-Range Weather Forecasts, will sharpen the probability as July 9 approaches.
• Baiu front position relative to the Kanto Plain determines whether Tokyo sees a humid, suppressed-temperature day or a hot, clear-sky afternoon.
• Urban heat island effects at the Chiyoda observation point tend to push daily highs slightly above regional averages, favoring the upper end of the forecast range.
• Any typhoon or strong low-pressure system in the western Pacific could dramatically shift temperatures and reprice all bands simultaneously.

Total volume of $8,757 reflects a market that activated quickly and recently. The data currently favors the 29°C band as the single most likely outcome in a fragmented field, but the 68.5% NO weight reflects the basic math of multi-band temperature markets: spreading probability across eleven bins means no single outcome dominates. The JMA forecast, not trader sentiment, will settle this.

LINES VERDICT

LEADING OUTCOME, NARROW WINDOW

The 29°C band holds the highest single-outcome probability in a fragmented eleven-way market, and the past hour’s buying suggests forecast models are converging in its direction. That’s the signal. But the window between 28°C and 30°C is narrow, and Tokyo’s early-July variability is real.

What the market says: The 31.5% implied probability on 29°C makes it the favorite outcome, but in a multi-band market that is a plurality, not a majority. Price can move sharply before the July 9 resolution as new JMA forecasts publish.

Key unknown: The Japan Meteorological Agency’s 24-hour forecast update on July 8 is the single data point that will reprice every temperature band in this contract before resolution.