Singapore Hit 31°C on June 25, Market Resolved YES | Lines.com

Singapore’s Meteorological Service recorded a daily maximum of 31°C on June 25, 2026, resolving this Polymarket temperature market in full. The outcome landed in the 31°C bracket, the single most contested bucket in a field that stretched from 25°C or below all the way to 35°C or higher. Here’s what the measurements are telling us: the city-state’s wet-season thermometer landed exactly where the low end of tropical probability mass had been pointing.

Traders opened this market pricing the 31°C outcome at just 27%, a genuine coin flip against the wider distribution. By June 25 the price had surged to 100%, a 55.5-point move in 24 hours. The total volume of $63,217 confirms real conviction came in late, not early. The market was pricing uncertainty, not science, right up until the MSS reading landed.

How Singapore Reached 31°C on June 25

Singapore sits in a monsoon-influenced equatorial climate where June daily highs typically cluster between 29°C and 32°C. The Meteorological Service Singapore records its official daily maximum from a network of island-wide stations, and the June 25 reading came in at 31°C. That figure triggered full resolution of the 31°C outcome bracket and sent the price to 1.00.

The final hours of trading told the clearest story. The 31°C bracket opened on June 24 with a 26% upward move, then gained another 10% overnight before adding a final 25.2% surge on June 25 itself. Traders who had held the 31°C position from the market’s opening price of 0.27 earned full resolution at 1.00. Those who came in during the late spike paid a steep premium for confirmation they could have read in the morning forecast.

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How the Market Priced This Outcome

The implied probability at market open sat at 27%, reflecting the genuine difficulty of pinpointing a single 1°C bucket out of 11 possible outcomes. That starting price was not wrong. Distributing probability mass across a wide temperature range is the rational response when the resolution window is weeks away. The data doesn’t care about the politics of market structure, and here the structure was genuinely hard.

The $63,217 in total volume, with $48,239 arriving in the final 24 hours, confirms that most money moved on confirmation rather than conviction. Liquidity of $75,236 supported clean price discovery once the MSS reading became apparent. The late-market compression from 0.27 to 1.00 in roughly 48 hours reflects a weather market dynamic: information arrives in a rush as the resolution date closes in.

Market Performance Summary

• Resolution Outcome: 31°C (YES confirmed)
• Article-Time Probability: 100% (fully resolved)
• Final Price at Close: 1.00
• Total Volume: $63,217
• Market Assessment: Underpriced YES. The 31°C bracket opened at 0.27 despite sitting near the center of Singapore’s June temperature distribution.

What This Outcome Means for Singapore’s Climate Signals

A 31°C daily maximum in Singapore during late June falls within the historical norm for the southwest monsoon season. The MSS long-term average for June daily highs hovers near 31°C, meaning the market resolved at the climatological mean, not at an anomaly. That context matters for anyone using these temperature markets as a proxy for heat stress or urban heat island monitoring.

For prediction markets, this resolution highlights a structural quirk in single-day weather markets. A 27% open price for the climatologically central outcome suggests traders were spreading probability mass too evenly across the full distribution. In a market with 11 buckets, uniform distribution would assign each roughly 9%. The 31°C bracket attracted 27% at open, which was above uniform but still underweighted for the modal outcome of Singapore’s June climate record.

Forward Signals

• Singapore’s MSS data for July through September will show whether the 31°C June 25 reading tracks with a broader warm or cool monsoon pattern for the 2026 southwest monsoon season.
• Polymarket’s Singapore temperature series for June 26 and beyond will test whether the late-June distribution shifts toward 32°C as the monsoon trough evolves.
• The concentration of $48,239 in 24-hour volume suggests late-entry traders dominate these weather markets, which creates early-window pricing inefficiencies that systematic traders can exploit.
• Urban heat island research in Singapore has tracked a long-run warming trend of roughly 0.25°C per decade, meaning the 31°C threshold may become structurally more likely in future June markets.

LINES RESOLUTION VERDICT

CORRECTLY PRICED IN DIRECTION, UNDERPRICED IN MAGNITUDE

The 31°C outcome resolved YES on June 25, 2026, landing at the climatological center of Singapore’s June temperature distribution and confirming that early traders spread probability too thin across the full 11-bucket range.

What the market showed: The 31°C bracket opened at 27% implied probability and closed at 100%, a 73-point gap that reflects late information arrival rather than early analytical failure. The data doesn’t care about the politics of when traders decide to commit.