Highest temperature in Wellington on July 9?

Platform comparison

Market context

The real-world event centres on the highest temperature recorded at Wellington International Airport on 9 July 2026, with the current crowd-implied probability of a specific outcome sitting at 0% YES. Historical data confirms July is the coldest month in Wellington, with average highs of just 14°C and lows of 4°C, making extreme warmth highly improbable [5]. Comparable markets for earlier July dates show similar volatility; for instance, a contract for 6 July estimated a 51% chance of exactly 13°C, while the 9 July contract currently prices 11°C at nearly even odds, suggesting the market views adjacent outcomes as a genuine toss-up rather than a certainty [2][4].

Traders should monitor immediate weather dependencies, specifically the persistent strong south-south-westerly winds and light rain currently affecting the airport, which are suppressing temperatures to 10°C as of 7 AM [1][8]. The settlement relies entirely on Wunderground data, meaning any sudden shift in wind direction or cloud cover could alter the daily maximum, though the prevailing storm system suggests temperatures will remain near the climatological average [3]. Analyst consensus diverges slightly from sportsbook lines on similar science contracts, with some platforms treating the 11°C outcome as a coin flip while others hedge against adjacent ranges, highlighting the need to cross-reference odds across multiple prediction platforms before committing capital [2][4].

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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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