Highest temperature in Wellington on August 1?

Platform comparison

Market context

Wellington’s highest temperature on 1 August will be measured at Wellington Intl Airport Station and settled against Wunderground’s daily history page, so the relevant question is whether the day produces an unseasonably warm spike rather than an average August reading.[11] The crowd-implied 0% YES price is notably detached from the historical climate profile: August is one of Wellington’s cooler months, with typical highs around 11–13.6°C and average August highs near 12°C across several climate summaries.[1][2][3][4]

That low pricing looks understandable when set against the city’s record structure. Public climate datasets put Wellington’s August record highs in the mid-teens, with one source showing 15.8°C as the monthly record and others clustering August daily highs around 11–14°C.[4][6][8] In other words, the market is effectively asking for a reading that sits at or above the upper tail of the local August distribution, not merely a mild winter day, which helps explain why the contract screens as a longshot despite the fact that a 0% implied probability is usually more a pricing artefact than a literal impossibility.[4][6]

For traders, the main catalyst is the weather itself: a brief northerly flow, clear skies and strong sun can lift airport temperatures above the usual August band, while southerlies and rain keep the day near the seasonal norm.[1][9][14] The key dependency is the final Wunderground airport observation for the full calendar day, so intraday swings and late-afternoon warming matter more than the morning forecast. With no sportsbook-style line typically available for a one-off temperature range contract, the comparison point is largely analyst climatology versus market price; here, the climatology supports a low-probability outcome, but not a literal zero.

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

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 vs Polymarket. 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.

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.

Do I need to KYC for this market?

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