Highest temperature in Wellington on July 9?

Platform comparison

Market context

The real-world event in question is the highest air temperature recorded at Wellington International Airport on 9 July 2026, measured in degrees Celsius and resolved via Wunderground data. While one prediction market currently implies a 0% chance for the 11°C contract, a cross-platform comparison reveals a stark divergence: Lines.com shows the same 11°C contract trading at nearly even odds, with a YES price of $0.48 and a NO price of $0.53, suggesting the market is far more open than the zero-implied probability suggests.

Historical patterns for Wellington in early July frame this volatility; average highs in the first ten days of the month typically reach 17.6°C, though seasonal outlooks from NIWA indicate temperatures are equally likely to be near or below average, with occasional cold snaps possible under persistent high pressure [4]. BBC Weather currently records a temperature of 13°C with a moderate southerly breeze and rising pressure, conditions that often suppress peak daytime highs in the region [2]. This mix of near-average expectations and cold-snap risks explains why traders see value in the 11°C line despite the zero-implied probability elsewhere.

Traders should monitor the National Weather Service time-series for Wellington International Airport, particularly the overnight rain and wind events forecast for the early hours of 9 July, which could limit the daytime temperature ceiling [3]. The settlement window closes at 12:00 UTC, meaning any late-morning cloud cover or precipitation shifts will be critical; analysts note that persistent high pressure in the South Island often brings fog and frost, directly impacting the maximum temperature recorded [4]. No major announcements are scheduled, but the dependency on clear, dry morning conditions remains the primary catalyst for the outcome.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on July 9? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 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.

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.

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.