Highest temperature in Wellington on July 25?

Platform comparison

Market context

Wellington Airport will record a single daily maximum temperature on 25 July 2026, measured in Celsius at the official meteorological station. The settlement mechanism relies on historical data retrieval from Weather Underground's daily archive, requiring manual verification of the recorded high for that specific date and location. For automated systems, this presents a straightforward data-pull scenario: the resolution hinges on a single numeric value published post-event, with no ambiguity around measurement methodology or station changes.

July sits within Wellington's winter season, when daily highs typically range between 11–13°C, though cold snaps can drive maxima below 8°C and occasional mild days may reach 15°C or higher. Historical precedent from the past five winters shows the airport station rarely exceeds 16°C in mid-winter; the 0% crowd probability suggests traders are pricing in an expectation of temperatures clustering in the 8–14°C band. Comparable markets on southern hemisphere winter temperatures have historically resolved toward the cooler end of seasonal norms, particularly when settlement windows close at midday local time, potentially excluding afternoon warmth.

Traders monitoring this market should track the Southern Oscillation Index and any La Niña or El Niño progression through early 2026, as these drive Wellington's seasonal temperature variance. The New Zealand MetService publishes monthly outlooks and long-range forecasts; significant deviations from the July 2025 baseline would signal shifting probabilities. For programmatic approaches, setting conditional orders around MetService seasonal forecasts released in May or June 2026 would allow dynamic position adjustments before the settlement window closes.

Methodology

We track Highest temperature in Wellington on July 25? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

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.