Highest temperature in Wellington on August 19?

Platform comparison

Market context

Wellington's maximum temperature on 19 August 2026 will be determined by the Daily Observations dataset from Weather Underground's Wellington International Airport station. The 0% crowd probability reflects the market's current state rather than any meteorological certainty; with settlement nearly two years away, temperature forecasting at this range remains speculative and dependent on seasonal patterns that won't solidify until closer to the date.

August represents Wellington's late winter period, when daily highs typically range between 10–13°C, though extremes occasionally push toward 15–16°C during warmer anomalies. Historical data from the past decade shows that mid-August temperatures in Wellington rarely exceed 14°C, with readings above 16°C occurring in fewer than 5% of years. The resolution methodology—using the Daily Observations table rather than summary highs—matters for precision, as these granular records sometimes capture intraday peaks that rounded summaries miss.

Traders monitoring this market should track Southern Hemisphere winter forecasting updates as 2026 approaches, particularly any shifts in the Southern Annular Mode or persistent high-pressure systems that could drive warmer-than-typical conditions across New Zealand. El Niño or La Niña status in mid-2026 will influence broader seasonal temperature patterns. The specific date falls within a window when Wellington occasionally experiences brief warm spells, though sustained heat remains unlikely for this period.

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.

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 Prediction Today. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.