Highest temperature in Wellington on July 23?

Platform comparison

Market context

Wellington’s hot-weather upside today is defined by the maximum temperature recorded at Wellington International Airport, with the settlement source reading taken from the day’s Wunderground history page. With the market currently implying **0% YES**, the crowd is effectively saying the observed high will land outside the relevant range, which is consistent with a very specific temperature outcome structure rather than a broad “warmer than usual” view.[1]

For calibration, this kind of airport-based temperature market is usually read against the local seasonal norm and the intraday progression of the forecast rather than against headline city weather. Wellington in July is typically winter-cool, and airport highs tend to cluster in a narrow band, so a programmatic trader would usually weight short-horizon model updates, observed morning temperature, cloud cover, wind direction, and any late-day frontal timing more heavily than a single daily forecast number. The current pricing also suggests the market is already tightly anchored to one dominant bin, so small forecast shifts are more relevant than large directional moves.[1]

The main catalysts are the same inputs that can move the day’s maximum late in the session: updated MetService or bureau forecasts, arrival timing of rain bands or wind shifts, and whether the airport actually gets a brief afternoon lift before the cutoff in the settlement window. For a rules-based setup, the practical workflow is to poll the live weather feed, compare the latest airport forecast with the Wunderground history page, and only act if the expected high crosses a range boundary rather than simply changes by a fraction of a degree.[1]

Sources: 1

Methodology

We track Highest temperature in Wellington on July 23? 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.