Highest temperature in Wellington on July 15?

Platform comparison

Market context

Wellington is bracing for a cool midwinter day as the city’s highest temperature on 15 July 2026 is expected to hover near 12°C, with the prediction market currently assigning zero probability to any outcome above this range. Over the past 24 hours, a strengthening south-southwesterly flow has pushed pressure down to 996mb and driven wind speeds to 38 km/h, suppressing any chance of a temperature spike [3]. This aligns with the market’s frontrunner, where 12°C and 13°C each hold 47% implied probability, suggesting traders are confident the day will remain firmly in the lower end of July’s typical range [1].

Historically, July highs at Wellington International Airport rarely exceed 58°F (14.4°C), with daily highs typically clustering around 54°F (12°C) and only occasionally breaching 58°F [2]. The current 0% YES probability for higher temperatures reflects this pattern: midwinter in Wellington is consistently cool, and the recent influx of polar air has made even a 13°C day feel marginal. Comparable cases from previous winters show that when winds exceed 30 km/h from the south, temperatures rarely climb above 12°C, reinforcing the market’s tight confidence in the lower range [4].

Traders should monitor the MetService hourly updates for any shift in wind direction or pressure, as a sudden northerly turn could push temperatures toward 13°C or higher [4]. The next 48 hours are critical: if the current southerly flow persists, the 12°C outcome becomes increasingly likely. No major weather announcements are scheduled, but real-time station data from NZWN will be the definitive settlement source via Wunderground, so any deviation in the 33 km/h north wind or 68% humidity could signal a change [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

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 Prediction Today. 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.

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.