Highest temperature in Wellington on August 17?

Platform comparison

Market context

On 17 August 2026, Wellington International Airport will record its highest temperature for that date. The market currently shows 0% implied probability across all temperature ranges, suggesting either insufficient liquidity or a technical issue with the contract's initial seeding. Resolution will depend on the Daily Observations table from Weather Underground rather than the Day High & Low summary, a distinction that matters when station equipment logs micro-fluctuations differently from rounded daily summaries.

Wellington's August climate sits firmly in the southern hemisphere's winter, with historical August maxima typically ranging between 11–14°C. The 17th holds no particular meteorological significance within the month, though winter weather systems can produce occasional warm spells when northerly flows push subtropical air southward. Comparable August days over the past decade have rarely exceeded 16°C at the airport station, with extremes requiring unusual atmospheric conditions—a blocking high-pressure system or warm front passage—to materialise.

Traders should monitor MetService forecasts released in the week preceding 17 August, particularly any warnings of warm northerly winds or high-pressure ridges tracking across the lower North Island. The settlement window closes at 12:00 UTC on the resolution date, meaning New Zealand's afternoon temperatures will already be recorded before final odds adjustments occur. Any significant weather pattern shift flagged by the National Institute of Water and Atmospheric Research in their seasonal outlooks could shift market pricing, though current zero probability suggests the market has not yet attracted substantive trading activity.

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

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.

UK Frequently Asked Questions

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.

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.

What are the best prediction markets for UK traders in 2026?

For UKGC-regulated markets: Betfair Exchange (sports, politics) and Smarkets (sports, politics, lower commission than Betfair). For broader global event prediction: Polymarket (deepest liquidity, 0% fee, USDC settlement). For US-regulated option: Kalshi (USD, limited UK payment options). Most serious UK traders use a combination of Betfair for regulated sports and Polymarket for broader markets.