Highest temperature in Wellington on May 26?

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Market context

Wellington's maximum temperature on 26 May 2026 will be measured at the International Airport weather station and resolved against historical records from Wunderground. The settlement window closes at 12:00 UTC that day, giving traders a defined endpoint for price discovery. Current crowd positioning shows zero probability assigned to any temperature bracket, suggesting either early-stage liquidity or genuine uncertainty about which range will resolve in-the-money.

May in Wellington falls within late autumn, when daily highs typically range between 12–16°C. Historical data from the airport station shows May temperatures rarely exceed 18°C and frequently dip below 10°C on cooler days. The 0% crowd probability across all brackets indicates either thin initial trading or that participants are awaiting clearer seasonal forecasts before committing capital. Comparable May days at Wellington Airport over the past decade provide the baseline: most settle in the 13–15°C band, with outlier warm days reaching 17–18°C and cold snaps dropping to single digits.

Traders should monitor the Southern Hemisphere autumn weather patterns in early May, particularly any anomalous anticyclonic systems that could push temperatures above the seasonal mean. The New Zealand MetService typically issues extended forecasts 10–14 days ahead; these updates will be material to position adjustments. Settlement depends entirely on Wunderground's historical data feed for NZWN station, which records observations throughout the day—the highest reading, regardless of time, determines resolution. Any technical delays in data publication beyond the 12:00 UTC window could affect final settlement timing.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — are listed with their platform attributes, because they operate off-chain and a 1:1 comparison of contract mechanics isn't possible.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Where can I trade this market with the lowest fees?

On BTC Prediction, 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?

BTC Prediction 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 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?

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

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.