Highest temperature in Wellington on July 28?

Platform comparison

Market context

Wellington's maximum temperature on 28 July 2026 will be recorded at the airport weather station and resolved against Wunderground historical data. The current market pricing reflects zero probability across all temperature bands, a positioning that typically emerges when traders await seasonal baseline data or when liquidity remains thin ahead of the settlement window. July sits firmly within Wellington's winter season, when daily highs typically range between 11–13°C, though the specific outcome depends on atmospheric conditions weeks in advance.

Historical July records for Wellington show considerable variability despite the season's general coldness. The airport station has recorded July maxima ranging from single digits to the mid-teens Celsius, with occasional warm northerly flows pushing temperatures into the high teens. Comparable winter days in the Southern Hemisphere's temperate zones demonstrate that even mid-winter forecasts remain uncertain beyond ten days, making early probability assignment difficult. The 0% crowd pricing likely reflects genuine uncertainty rather than confidence in any particular outcome band.

Traders monitoring this contract should track Southern Oscillation Index (SOI) trends and Niño 3.4 sea surface temperature anomalies, which influence New Zealand's winter weather patterns months ahead. MetService and NIWA issue seasonal outlooks typically in June that could shift market expectations. The settlement window closes at midday UTC on 28 July, requiring traders to account for any timezone conversion between local Wellington time and the resolution timestamp. Wind patterns from the Tasman Sea and Antarctic pressure systems will be the primary drivers of actual conditions on the day.

Methodology

This page reviews Highest temperature in Wellington on July 28? 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 PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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