Highest temperature in Wellington on July 20?

Platform comparison

Market context

Wellington’s highest temperature on 20 July 2026 will be recorded at the Wellington International Airport Station, with the market resolving to the Celsius range containing that peak. The crowd currently assigns a 0% implied probability to the YES outcome, signalling near-universal consensus that the temperature will fall outside the specified range. Historically, mid-July in Wellington sees average highs between 10°C and 14°C, with extreme outliers rarely exceeding 18°C even during warm spells. Comparable cases from the past decade show that temperatures above 20°C on this date are exceptionally rare, supporting the market’s bearish stance.

Traders should monitor real-time weather feeds from Wunderground as the settlement window closes at 12:00 UTC on 20 July, watching for any unforecasted warm air intrusions from the Tasman Sea. While no major announcements are scheduled, sudden shifts in wind direction or pressure systems could act as catalysts, though such events are statistically improbable in this season. A contrarian angle exists only if a rare marine heatwave coincides with clear skies, but current models and historical data suggest this is not a value spot. The consensus appears well-founded, leaving little room for upside deviation.

Methodology

We track Highest temperature in Wellington on July 20? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.