Tokyo July 8 Low Hit 22°C, Resolving Polymarket at 100% | Lines.com

Tokyo recorded a minimum temperature of 22°C on July 8, 2026, resolving this Polymarket prediction market exactly on the marked outcome. The Japan Meteorological Agency confirmed the reading for the July 8 observation window, closing out one of the more granular climate markets on the platform. Traders who priced the 22°C outcome correctly walked away with a clean resolution.

The market opened at 38% implied probability for the 22°C outcome and finished at 100% by close on July 8. That 62-percentage-point run in the final 48 hours tells the real story here. The market wasn’t pricing 22°C as inevitable a week out. It got there through a rapid convergence as weather data tightened. Total volume reached $32,498, which is meaningful for a daily temperature precision market. The market is pricing uncertainty, not science.

Tokyo’s July 8 Minimum Temperature Confirmed at 22°C

The 22°C resolution sits in a historically plausible but not obvious range for Tokyo in early July. The city’s early-July average overnight low runs near 21°C to 22°C, meaning this outcome landed right at the climatological mean. That wasn’t guaranteed. Tokyo’s overnight lows in July can range from the high teens during cooler air mass intrusions to the upper 20s during peak heat dome conditions. July 8 landed in the middle of that distribution.

The resolution source confirmed the outcome cleanly with no ambiguity. In the final hours before the 12:00 JST cutoff, the market had already converged toward certainty. The final probability at close reflected the near-certain read that weather stations were already recording temperatures consistent with the 22°C bracket. That kind of late-stage convergence is characteristic of short-horizon meteorological markets when observed data starts flowing.

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How the Market Performed on a Precision Weather Outcome

The market opened this 22°C outcome at 38% implied probability (a price of $0.38) and closed at 100%. That opening price was not unreasonable given the spread of possible outcomes across a 12-bracket range spanning 16°C or below through 26°C or higher. With eleven possible resolution buckets, a flat prior would put each near 9%. The 38% opening price indicated traders already leaned toward the 22°C to 24°C range as the most likely cluster for an early-July Tokyo overnight low.

The $32,498 in total volume and $44,525 in liquidity both signal genuine trader conviction for a niche daily-temperature market. The 24-hour volume of $16,605 represents more than half the total, confirming that most conviction arrived late as forecast data tightened. Here’s what the measurements are telling us: the market was directionally right early and precisely right late.

• Resolution Outcome: 22°C confirmed for Tokyo on July 8, 2026.
• Article-Time Probability: 100% (YES price: $1.00 at time of rewrite).
• Final Price at Close: 100% ($1.00).
• Total Volume: $32,498.
• Market Assessment: Correctly priced at close. Underpriced YES at open (38% opening price for an outcome that resolved at 100%).

What a 22°C Low Means for Tokyo’s Summer Climate Picture

A 22°C overnight minimum on July 8 places Tokyo squarely within its historical early-July baseline. The city has seen its summer nights warm steadily over the past three decades as the urban heat island effect and broader regional warming trends push overnight temperatures higher. A 22°C reading in the first week of July was once above average. It now sits at or slightly below the recent mean.

For prediction market design, this resolution highlights a structural challenge in precision temperature markets. Twelve outcome buckets across a 10-degree range creates genuine price discovery difficulty early in the window. The market handled it by remaining uncertain until observational data resolved the ambiguity, which is exactly how these markets are supposed to work. The binary structure expanded to a multi-bracket format here, and the market still found its way to the correct answer. The data doesn’t care about the politics, and it doesn’t care about market structure either.

• Tokyo’s overnight lows in July are trending warmer decade over decade, compressing the probability of sub-20°C outcomes in early summer.
• Short-horizon weather markets on Polymarket tend to see their sharpest volume and price movement in the final 24 to 48 hours as forecast model outputs tighten.
• The 22°C to 24°C cluster represented the highest-probability zone for an early-July Tokyo low, and the market correctly identified that range from opening day.
• Future precision temperature markets on Tokyo summer nights should expect the sub-21°C outcomes to carry lower baseline probability as urban warming trends continue.

LINES RESOLUTION VERDICT

RESOLVED YES: 22°C CONFIRMED

The market priced this outcome correctly in direction from the start and precisely at the close, reflecting how short-horizon weather markets sharpen as observational data arrives.

What the market showed: The 22°C outcome opened at 38% implied probability and closed at 100%, with $32,498 in total volume confirming late-stage trader conviction as Tokyo’s July 8 overnight low was confirmed by meteorological observation.