Highest temperature in Wellington on May 26?

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Market context

Wellington's highest temperature on 26 May 2026 will be recorded at the airport weather station and settled against Wunderground historical data. The market currently prices all temperature ranges at 0% probability on Polymarket, suggesting either extreme illiquidity or a technical issue with the conditional token structure on Polygon. This settlement window closes at midday UTC on the day itself, giving traders a narrow window to adjust positions once morning observations begin filtering through.

May in Wellington sits at the tail end of autumn, with daily highs typically ranging between 13–16°C. Historical data from the past five years shows the airport station rarely records temperatures above 18°C during late May, though anomalous warm days do occur roughly once per decade when northerly flows push subtropical air southward. The 0% crowd probability likely reflects the market's nascent state rather than genuine conviction that all temperature bands are impossible; similar weather markets on Polymarket often show distorted prices until sufficient liquidity accumulates.

Traders should monitor the Southern Oscillation Index and sea surface temperature anomalies in the Tasman Sea during May, as these drive the likelihood of warm northerly outbreaks. MetService New Zealand publishes its monthly outlook in early May, which will clarify whether any unusual patterns are forecast. The USDC settlement mechanism means resolution depends entirely on Wunderground's historical archive being accessible and accurate on 26 May; any data gaps or corrections after the settlement window closes would create disputes.

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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

Where can I trade this market with the lowest fees?

On Kalshi UK, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in minutes.