Highest temperature in Wellington on August 5?

Platform comparison

Market context

Polymarket is currently pricing the Wellington airport temperature contract at **0% YES**, even though the market settles on the day’s *highest* reading at Wellington Intl Airport Station and pays out through conditional tokens on Polygon in USDC. The key question is not whether it is cold in Wellington, but whether the airport’s top hourly or sub-hourly observation on 5 August 2026 lands in the specific Celsius band that defines YES.

For context, Wellington’s August climate is typically cool and fairly stable, with long-run summaries putting average daytime highs around **12°C** and overnight lows several degrees lower[12][14][18]. Forecast-style sources for 5 August are clustered around the low teens at best, with some showing peaks near **9–13°C** and others slightly warmer at **11–13°C**; that range matters because a small deviation can move the final observation into a different band[2][5][6][7]. A 0% market often reflects either a very unlikely threshold or a band the crowd thinks the final print will miss, but it can still reprice sharply if the day’s actual high shifts by only one or two degrees.

A trader should watch the live Wellington Intl Airport observations on Wunderground, because settlement uses that source rather than a city-wide forecast[1]. The most relevant catalysts are the day’s wind and cloud pattern, plus any front that lifts the afternoon high; current forecasts mention breezy conditions, variable cloud, and temperatures clustered well below summer levels[3][4][5]. On Polymarket, the practical mechanics are straightforward: the position is held in USDC, trades on Polygon, and resolves only when the recorded airport high is known.

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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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.

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.

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 PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.