Singapore Hit 32°C on June 28, 2026 | Lines.com

Singapore recorded a daily maximum of 32 degrees Celsius at Changi Airport Station on June 28, 2026, resolving this Polymarket temperature market in favor of the 32°C bracket. The outcome matched the meteorological backdrop: Singapore’s Meteorological Service had flagged daily highs of 32 to 34°C across most days in the second half of June. The measurement, drawn from Wunderground’s Changi Airport data, confirmed what the market’s final price had already telegraphed.

Traders priced this market at 37% for most of its life. That changed sharply on the day of resolution. A 46.4% surge in implied probability on June 28 pushed the final price to 99.9% YES, reflecting real-time temperature data flowing into trader positions. The market opened at 37 cents and closed at one dollar. Total volume reached $52,502, a meaningful signal that traders treated this bracket as genuinely contested before the data arrived.

Singapore’s Changi Station Confirmed the 32°C Reading

Changi Airport Station logged 32°C as the day’s peak on June 28, 2026. The resolution source, Wunderground’s daily maximum for the Singapore Changi Airport station, provided the authoritative measurement. Singapore’s equatorial position and the active Southwest Monsoon pattern both shaped conditions that day. Afternoon cloud cover from convective activity and evaporative cooling from thundery showers kept the peak from climbing higher, consistent with the pattern that had prevailed across the second half of the month.

The final price at close sat at 99.9% YES, essentially a certainty signal. The convergence happened fast: prices jumped 10% on June 27, then surged another 34% in the early hours of June 28, and added a further 10.4% before settlement. Traders were not guessing at the close. They were reading the same station data that would confirm resolution.

Sponsored Partner

How the Market Performed on This Temperature Call

The 32°C bracket opened this market at 37% implied probability. That means the market initially treated this outcome as less likely than not. By resolution, the price had reached 99.9%. The market started misaligned with the eventual outcome and corrected only when same-day temperature readings arrived. This is classic late-information repricing, not a market that correctly priced the outcome from the start. The early 37% price undervalued the 32°C bracket significantly given Singapore’s June climatology.

Total volume of $52,502 is moderate for a science market on a single-day measurement. Liquidity of $107,486 exceeded volume, suggesting the order book had depth that supported a cleaner price signal once information arrived. The $40,716 in 24-hour volume represents roughly 77% of all trading happening on the day of resolution itself. Traders concentrated activity when uncertainty collapsed, not before.

MARKET PERFORMANCE SUMMARY

• Resolution Outcome: 32°C bracket confirmed at Changi Airport Station on June 28, 2026.
• Article-Time Probability: 99.9% YES at the rewrite date of July 16, 2026.
• Final Price at Close: 99.9% YES (fully resolved at close).
• Total Volume: $52,502 across the market’s life, with $40,716 trading on June 28 alone.
• Market Assessment: Underpriced YES. The 32°C bracket opened at 37% and should have commanded a higher probability given Singapore’s climatological baseline for late June.

What the 32°C Resolution Means for Temperature Market Design

Singapore’s Changi Airport Station averaged daily highs in the 32 to 34°C range across the second half of June 2026. The 32°C bracket landing at the lower end of that range reflects how afternoon thundery showers under the Southwest Monsoon moderated peak surface temperatures on June 28. Traders who understood Singapore’s convective cycle, where cloud development suppresses extreme afternoon heating, had a climatological case for this bracket from the start. The market’s opening price did not reflect that case.

The binary-bracket structure of this market created a specific challenge. With eleven possible outcome bands from 25°C-and-below up to 35°C-and-above, probability was spread thin early. That thinning meant the correct bracket sat underpriced until day-of data arrived. The resolution window ending at noon Singapore time further compressed the information advantage: traders with access to morning station readings had a structural edge over those pricing on climatological expectations alone.

FORWARD SIGNALS

• Singapore’s Meteorological Service reports the second half of June 2026 saw daily maxima of 32 to 34°C on most days, placing June 28 at the cooler end of that documented range.
• Changi Airport Station remains the authoritative data point for future Singapore temperature markets on Polymarket; Wunderground’s daily maximum is the resolution source, not daily averages or other stations.
• Southwest Monsoon conditions persist through September, meaning afternoon convective activity will continue to cap peak daily temperatures and influence similar markets for July and August 2026.
• The 46.4% single-day price swing shows that same-day meteorological data, not pre-event climatological modeling, drives price discovery in short-window temperature markets of this type.

LINES RESOLUTION VERDICT

UNDERPRICED YES

The 32°C bracket was the right answer from the start, but the market only priced it correctly once Changi Station data arrived on June 28. Here’s what the measurements are telling us: climatology had this bracket well within range, and traders who waited for real-time data captured the full move.

What the market showed: The 32°C bracket opened at 37% implied probability and closed at 99.9% YES. The market underpriced the most climatologically consistent outcome and corrected only when same-day temperature data collapsed uncertainty in a single trading session.