Amsterdam Hit 29°C on June 25, Resolving Market at 100% | Lines.com

Amsterdam reached a high of 29 degrees Celsius on June 25, 2026, resolving the Polymarket temperature market at full confidence. The outcome confirmed what traders had priced at 100% by the time the market closed at noon on June 25. This was the right call, landing squarely on the 29°C bracket in a market that offered eleven distinct temperature outcomes.

The market opened at 31 cents implied probability and closed at 100%, swinging 71.5 percentage points in the final 24 hours. That single-day surge tells the real story. Traders saw real-time conditions developing and piled in fast. Total volume reached $113,488, with $86,570 of that arriving in the final 24-hour window. The data doesn’t care about the politics — and on June 25, the thermometer delivered a clean answer.

Amsterdam Recorded 29°C on June 25, Confirming Market Resolution

The highest temperature recorded in Amsterdam on June 25, 2026 was 29°C. That result resolved the Polymarket bracket market, which required traders to select from temperature bands ranging from 28°C or below all the way up to 38°C or higher. The 29°C outcome sat at the lower end of what would turn out to be an exceptional heat stretch in the Netherlands. The following day, June 26, would push Amsterdam to a new all-time June record, making June 25 the warm runway into that peak.

The final probability at close stood at 100%, meaning the market had fully converged before the official resolution window closed at noon. The 24-hour volume surge to $86,570 showed traders were not waiting for uncertainty to resolve naturally. They moved decisively on observed conditions.

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How the Market Performed on a Granular Temperature Call

The implied probability at article time sits at 100%, reflecting a fully resolved market. The more instructive figure is the opening price: 31 cents. That means the market opened pricing a roughly 69% chance that Amsterdam would land somewhere other than 29°C on June 25. With eleven available outcomes, that skepticism was structurally rational. Picking a single 1-degree band in an 11-way market is inherently uncertain. Here’s what the measurements are telling us: the market was genuinely uncertain early, correctly uncertain given the format, and then snapped to certainty as conditions became observable.

Total volume of $113,488 with $81,039 in liquidity signals strong price discovery for a weather micro-market. The 24-hour volume of $86,570 — more than 76% of total volume — confirms this was a late-converging market. Traders did not have meaningful informational edge weeks out. They had edge only when the day arrived and real-time temperature data started flowing.

Market Performance Summary

• Resolution Outcome: 29°C confirmed on June 25, 2026
• Implied Probability at Article Time: 100% (fully resolved)
• Price at Market Open: 31 cents (approximately 31% implied probability)
• Final Price at Close: 100%
• Total Volume: $113,488
• Market Assessment: Underpriced YES early, correctly priced as real-time data emerged

What the Amsterdam Heat Outcome Means Going Forward

June 25 at 29°C was not the end of the story. Amsterdam went on to set a June heat record on June 26, meaning the June 25 market captured only the build phase of that event. For prediction market design in weather categories, this matters. A single-day bracket market resolves cleanly, but it misses the arc of a multi-day heat event. Future temperature markets anchored to a single date may continue underpricing the higher brackets early, precisely because traders lack confidence in specific-day peaks within a heat sequence.

The market is pricing uncertainty, not science. On June 25, the science was unambiguous by midday — 29°C was the reading. The uncertainty was always about which day within a developing heat event would land where. That is a harder forecasting problem than it looks, and the late-breaking volume confirms traders treated it exactly that way.

Forward Signals

• Amsterdam’s June 26 peak at 36°C now stands as the all-time June record for the city, placing June 25’s 29°C in context as a precursor to an exceptional heat event.
• Single-day temperature bracket markets in European cities tend to attract late volume, with most conviction arriving only when same-day or next-day data becomes available.
• The 11-outcome bracket structure kept early implied probabilities low for any individual band, creating systematic underpricing of the eventual winner across most temperature scenarios.
• Prediction market designers pricing future Amsterdam summer temperature events should account for the city’s increasing variability, given the June 26 record established in 2026.

LINES RESOLUTION VERDICT

RESOLVED YES: 29°C CONFIRMED

The market was underpriced early and correct at close — a late-converging structure that rewarded traders who read same-day conditions rather than long-range forecasts.

What the market showed: The 29°C bracket opened at roughly 31% implied probability across an 11-way market, snapped to 100% on June 25 as real-time temperatures became observable, and closed fully resolved. The $86,570 in final-day volume confirms this was a same-day information trade, not a long-range forecast trade.

This analysis reflects the confirmed resolution of this market as of June 25, 2026. Prediction market probabilities reflect collective trader conviction, not guaranteed outcomes. Lines.com does not accept bets or provide financial or gambling advice.