Tokyo July 6 Low Temperature: 21°C Leads at 99.5% | Lines.com

The Polymarket prediction market on Tokyo’s lowest temperature for July 6, 2026 has converged almost entirely on 21°C, with traders pricing that outcome at a 99.5% implied probability. The market closes at 12:00 UTC on July 6, 2026. Eleven alternative outcomes span a range from 16°C or below all the way to 26°C or higher. None of them attract meaningful liquidity at this stage.

Traders moved with unusual conviction here. The 24-hour price change of +50.5% and the one-hour jump of +33.5% both signal a rapid, concentrated shift toward the 21°C outcome. Total volume reached $27,955, with $19,630 of that arriving in the final 24 hours alone. When nearly three-quarters of total volume lands in a single day, the market is not drifting to consensus. It is sprinting there. The data doesn’t care about the politics, and in a weather market, it doesn’t care about opinion either.

What the 21°C Outcome Means for Tokyo on July 6

Tokyo’s July overnight low temperatures historically cluster between 21°C and 25°C based on long-run climate records. A reading of 21°C would sit at the cooler end of that range for the month. Early July, before the peak of the humid season takes hold, can still deliver slightly cooler nights when synoptic pressure patterns push drier air over the Kanto Plain. That meteorological context makes 21°C a plausible, if slightly below-average, outcome for the date.

The market did not open at 99.5%. The price at open was near 40%, reflecting genuine early uncertainty distributed across the temperature range. The concentrated late-session buying collapsed that spread and pushed the 21°C outcome to near-certainty in under 48 hours. That kind of movement strongly suggests traders with access to high-resolution short-range model output, likely 24- to 36-hour ensemble forecasts, drove the final price compression. This is what informed participation looks like in a granular weather market.

Here’s what the measurements are telling us: a 21°C overnight low in Tokyo on July 6 would not be a record or an anomaly. It would be a cooler-than-typical July night, consistent with a pattern where cloud cover or post-frontal airflow limits the urban heat island effect that usually keeps Tokyo’s overnight temperatures elevated. The gap between 21°C and the more typical 23°C to 25°C range is meaningful, but within the normal variance of early-July weather.

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How the Market Is Performing Before Close

An implied probability of 99.5% heading into close is about as decisive as prediction markets get. The article-time probability matches the final-session price, and the direction of movement offers no ambiguity. Traders are not hedging. The 0.5% allocated to all other outcomes combined represents residual noise, not genuine disagreement about the temperature range.

Total volume of $27,955 is modest by major-event standards, but the $64,708 in liquidity is more than double the traded volume. That ratio indicates deep order-book support relative to the money actually changing hands. Price discovery here is credible. A thin market hitting 99.5% could reflect a single large position or manipulation. A liquid market hitting 99.5% reflects genuine convergence. This market is the latter. The market is pricing uncertainty, not science, and right now traders have essentially eliminated the uncertainty.

• Article-time probability for 21°C stands at 99.5%, implied by a $1.00 Yes price against a $0.01 No price.
• Total volume of $27,955 confirms real capital commitment rather than a thinly traded ghost market.
• Liquidity of $64,708 provides structural depth more than two times the traded volume, making the price signal reliable.
• The 24-hour volume of $19,630 shows late-stage conviction, not early positioning spread across weeks.

What This Outcome Signals Going Forward

A confirmed 21°C low on July 6 would sit at the statistical lower edge of typical early-July overnight temperatures in Tokyo. Climate records show Tokyo’s July lows have trended upward over the past two decades, with the long-run average sitting closer to 23°C to 25°C by mid-month. A 21°C reading would not be a statistical outlier for early July, but it would represent a cooler-than-average night relative to the trajectory of recent years in a city that is one of the most documented urban heat island environments on Earth.

For prediction market purposes, Tokyo daily temperature markets are a sharp illustration of how meteorological data compresses uncertainty fast. The market is pricing uncertainty, not science. When numerical weather prediction models lock in a specific overnight low with high confidence 24 to 48 hours before the measurement window closes, traders who use those models will push any affected outcome toward the extremes rapidly. The movement from 40% to 99.5% in under two days is a case study in that dynamic. Future participants in similar markets need to understand that the tradeable window is narrow, and late entry means paying near-resolved prices for exposure that offers little upside.

The correlation structure of this market also offers a signal worth noting. The strong positive correlation with the Highest Temperature in Hong Kong on July 7 market suggests traders are reading a regional synoptic pattern, not just a single-city forecast. When multiple temperature markets across East Asian cities move in alignment, the underlying driver is typically a broad atmospheric circulation feature rather than localized conditions. That regional coherence strengthens the case for the 21°C outcome reflecting real meteorological signal, not noise.

• Tokyo’s July overnight lows have trended warmer over the past two decades, making a 21°C reading a slightly below-average outcome that fits an early-July rather than peak-summer profile.
• Short-range weather model ensemble output likely drove the late-session price compression from 40% to 99.5%, compressing the effective trading window to under 48 hours.
• The strong positive correlation with Hong Kong temperature markets indicates a regional synoptic pattern is influencing multiple city-level temperature outcomes simultaneously.
• Future Tokyo temperature market participants should account for fast late-session convergence when models align, and price in the narrowing of the trading window accordingly.

LINES RESOLUTION VERDICT

MARKET PENDING RESOLUTION

The 21°C outcome holds a 99.5% implied probability heading into the July 6 close. Here’s what the measurements are telling us: traders with access to short-range forecast data have reached near-unanimity, the liquidity depth validates that signal, and the late-session volume surge leaves no ambiguity about directional conviction.

What the market shows: Implied probability opened near 40% and hit 99.5% after a 50.5% surge in the final 24 hours. A $64,708 liquidity pool supports the price. This is not a thin market at an extreme. It is a liquid market where forecast data and trader consensus have aligned.