Highest temperature in Wellington on July 7?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at Wellington International Airport in New Zealand on 7 July 2026, measured in degrees Celsius. With the current crowd-implied probability for any specific outcome sitting at 0%, the market treats the event as effectively impossible to hit a predefined threshold, likely reflecting the region’s typical midwinter climate. Historical data shows Wellington’s July daily highs rarely exceed 57°F (14°C), rarely falling below 48°F (9°C), with a long-term average hovering near 13°C [7]. Even during extreme heatwaves, such as when Kelburn reached 30.3°C in recent years, such spikes are exceptional anomalies rather than seasonal norms [8]. The national record for New Zealand remains 42.4°C, recorded in February 1973, underscoring that July heat is structurally improbable [9].

For traders monitoring this Polymarket contract, the key catalysts are not weather announcements but on-chain mechanics: USDC liquidity depth, Polygon network congestion, and conditional token settlement timing. Since the resolution source is Wunderground’s daily maximum for Wellington Intl Airport, any data gap or delay could trigger a no-trade outcome, reinforcing the 0% probability. Recent reports from NIWA highlight that Wellington’s heat records are tied to specific atmospheric conditions, not calendar dates, meaning July 7 is statistically unlikely to breach higher thresholds [8]. Traders should watch for updates on Wunderground’s data availability and any changes to the settlement window ending 2026-07-07T12:00:00Z, as these dependencies directly impact contract validity. The market’s pricing reflects not just meteorological reality but the technical fragility of on-chain resolution.

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Methodology

This page reviews Highest temperature in Wellington on July 7? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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