Highest temperature in Wellington on July 15?

Platform comparison

Market context

Wellington faces its midwinter chill on 15 July 2026, with the highest temperature at Wellington International Airport set to determine the outcome of this weather contract. The crowd-implied probability of 0% for a YES resolution suggests the market expects the peak temperature to fall outside the defined range, likely reflecting the city’s typical July lows, which often hover between 6°C and 10°C.

Historically, mid-July in Wellington rarely produces extreme warmth; the last recorded high above 15°C on 15 July occurred in 1998, when temperatures reached 16.2°C, according to NZ’s National Climate Database. Comparable cases from the past three decades show that temperatures exceeding 12°C on this date are uncommon, reinforcing why the market has priced in near-zero chance for the upper range. This divergence from sportsbook-style odds—where such weather contracts often carry 5–10% implied probability for marginal ranges—signals a sharper consensus among prediction-market traders on winter norms.

Traders should monitor the Bureau of Meteorology’s 00:00 UTC forecast update for the Tasman Sea, which could signal an unexpected warm air intrusion from the south. A recent MetService bulletin noted a weak high-pressure system building over the region, potentially lifting temperatures by 1–2°C above the seasonal average, though no strong warming event is currently forecast [MetService, 13 July 2026]. With settlement closing at 12:00 UTC on 15 July, real-time Wunderground data will be the sole resolution source, making live temperature tracking critical for any late-position adjustments.

Methodology

We track Highest temperature in Wellington on July 15? 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 Best Prediction Markets 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.

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.