Highest temperature in Wellington on August 15?

Platform comparison

Market context

Wellington International Airport's maximum temperature on 15 August 2026 will be recorded from the Daily Observations dataset on Weather Underground, with resolution tied to the specific instrumental reading rather than summary figures. The current crowd-implied probability of 0% suggests traders are pricing in either an expectation of moderate conditions or uncertainty about which temperature band will ultimately resolve.

August is Wellington's winter month, with historical daily maxima typically ranging between 11–14°C at the airport station. MetService data from prior August periods shows that temperatures exceeding 18°C on this date are exceptionally rare, occurring perhaps once per decade under anomalous warm-air advection from the north. The 0% probability on this contract likely reflects the base rate: most August 15ths in Wellington settle well below thresholds that would trigger higher-range resolutions. Comparable winter-month temperature markets in New Zealand have historically shown that extreme outliers—temperatures 5°C or more above the seasonal mean—command single-digit implied probabilities.

Traders should monitor MetService's medium-range forecasts from early August 2026, particularly any signals of subtropical air masses or blocking high-pressure systems that could drive anomalous warmth into the lower North Island. The Southern Oscillation Index and sea-surface temperature anomalies in the Tasman Sea will be relevant indicators of large-scale circulation patterns. Any significant revision to seasonal outlooks in late July or early August could shift market pricing, though the structural rarity of warm August days in Wellington means dramatic repricing would require genuinely exceptional forecast signals.

Methodology

We track Highest temperature in Wellington on August 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.

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.

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.

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.

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.