Highest temperature in Wellington on August 3?

Platform comparison

Market context

Polymarket is pricing the Wellington airport’s **highest temperature on 3 August 2026** at **0% YES**, which on a conditional-token market means the crowd is effectively assigning no value to the temperature landing in the YES range. The contract settles against the **Wellington Intl Airport Station** reading on Wunderground, with collateral in **USDC** on **Polygon**, so traders are really speculating on a single-day airport observation rather than Wellington’s broader city weather.

For context, August in Wellington is normally cool and changeable rather than warm: independent climate pages put average August highs around **12–13.6°C**, with typical lows near **4–9°C** and frequent rain or wind.[1][2][9] Historical summaries also show the month’s extreme highs are not especially elevated, with one weather archive citing an August record of **61°F (about 16°C)** and another giving a recent August maximum of **22.3°C** nationwide, well above Wellington’s norm.[7][4] That makes a forecast in the mid-teens Celsius plausible on a better-than-average day, but the market’s zero price suggests traders are treating a higher-than-expected spike as very unlikely.

The key catalysts are the live airport observations themselves: a brief northerly flow, sunshine breaking through cloud, or a post-front clear-out can lift the day’s maximum, while onshore winds and rain keep it pinned lower. Traders should watch the Wellington airport hourly feed on Wunderground, any MetService or NIWA outlooks for the lower North Island, and the timing of frontal passages or ridge-building through the day. Because the settlement window ends at **12:00 UTC**, the contract is sensitive to the local afternoon peak in Wellington, so any late-day warming still counts if it is recorded before expiry.

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

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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?

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