Highest temperature in Wellington on August 3?

Platform comparison

Market context

Wellington International Airport’s highest temperature on 3 August will be a low winter number, and the market is effectively a read on whether the day tops out in a very narrow band rather than on any meaningful heat event. Long-run August norms for Wellington are cool, with average highs around 12°C and frequent rain days, while the airport is already reporting single-digit to low-teens temperatures in current conditions and forecasts for today remain around 9–10°C. [2][3][10]

For a power-user, the cleanest way to approach this is to treat the market as a data-pull problem: query the Wunderground daily history page for NZWN, capture the day’s maximum temperature after the settlement window, and map that single value to the market’s temperature bracket. Because the contract settles on the highest recorded temperature at the airport station, not a citywide average or a forecast, the relevant historical framing is the distribution of Wellington winter maxima, which is typically compressed and weather-system driven. On that basis, a crowd-implied 0% for YES is consistent with a market that is heavily anchored to cold-season climatology rather than to volatility. [16][2][3]

The main catalysts are synoptic rather than scheduled: a northerly burst, a brief sunny spell, or a front crossing can shift the daily maximum by several degrees, but there is no obvious event calendar dependency in the market terms themselves. Traders using bots or conditional orders would usually watch short-range forecast updates from local and global forecasters, then re-check the airport observation feed as the day progresses, because the settlement depends on the final recorded maximum rather than the midday forecast. [10][9][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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.

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.

Do I need to KYC for this market?

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