Highest temperature in Wellington on July 6?

Platform comparison

Market context

The underlying event is the maximum temperature recorded at Wellington International Airport on 6 July 2026, with the current market implying a zero per cent chance of a specific outcome. Historical data frames this probability sharply: MetService records show Wellington’s July daily maximums typically cluster between 10°C and 14°C, with 12°C being a frequent peak [8]. While the current contract suggests no chance of a particular range, other platforms like Lines.com estimate a 51% probability that the temperature lands exactly at 13°C, presenting a stark divergence from the zero per cent implied probability here [1]. This coin-flip assessment aligns with the fact that July highs in Wellington rarely exceed 57°F (13.9°C) or fall below 48°F (8.9°C) [7].

Traders should monitor real-time weather updates from MetService New Zealand and Wunderground, the official resolution source, for any sudden shifts in cloud cover or wind patterns that could push temperatures outside the typical range. Although no specific announcement is scheduled, the dependency on atmospheric conditions means that even minor changes in the Southern Ocean’s influence could alter the outcome [2]. Recent heatwave data from NIWA shows Wellington can occasionally break records, reaching 30.3°C, though such events are rare and usually occur in summer, not July [4]. The key catalyst remains the daily high temperature reading itself, which will be the sole determinant for settlement when the window closes on 6 July 2026 at 12:00 UTC.

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