Highest temperature in Singapore on July 1?

Platform comparison

Market context

The underlying event is the peak daytime heat expected at Singapore Changi Airport on 1 July 2026, measured in degrees Celsius during the Southwest Monsoon season. While one prediction market shows a 0% implied probability for a specific outcome, cross-platform data reveals a stark divergence: Polymarket heavily favours 32°C at 44.5% and 31°C at 31.5%, assigning a 99% collective chance to the 32°C range[1]. This contrasts with the current crowd-implied probability of 0% on the queried contract, suggesting a significant misalignment between analyst consensus on climatological norms and the specific odds offered here.

Historical patterns frame this probability, as July in Singapore typically sees daily highs around 88°F (31.1°C), rarely dropping below 85°F or exceeding 91°F[4]. Although global records show July 2024 was the warmest on record with ocean temperatures reaching "hot tub levels"[3], Singapore’s local climate remains stable, with the Meteorological Service projecting above-average temperatures but below-average rainfall through August[1]. The 40-year record of 37.0°C remains an outlier, making a 32°C peak the statistically robust expectation rather than an extreme anomaly[9].

Traders should monitor the ongoing Southwest Monsoon schedule and any sudden shifts in cloud cover, which directly influence peak temperatures. The Meteorological Service Singapore’s projection for above-average heat through August is a key dependency to watch as the settlement window approaches[1]. No specific weather announcements are currently pending, but real-time updates from Weather Underground will determine the final resolution, as the market relies on their highest recorded temperature for all times on the day[8]. The divergence between platforms indicates that the 0% line may be an error or a niche bet, given the overwhelming consensus for 32°C elsewhere[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.