Highest temperature in Wellington on August 11?

Platform comparison

Market context

Wellington International Airport will record a daily maximum temperature on 11 August 2026, with settlement determined by the highest reading in Weather Underground's Daily Observations table rather than the Day High & Low summary. The market resolves to a temperature range bracket in degrees Celsius, with the current crowd probability at zero, indicating either extreme confidence in a specific range or minimal trading activity at present.

Wellington's August climate sits in the southern hemisphere's winter, with historical August maxima typically ranging between 11–14 °C at the airport station. The 0% probability on the YES option suggests traders have already committed capital to alternative temperature brackets, or the market lacks sufficient liquidity to reflect genuine uncertainty. Comparable August days over the past decade show little volatility in daily highs; extreme outliers above 18 °C or below 8 °C are rare but not unprecedented during unusual weather patterns.

Traders should monitor the Southern Oscillation Index and sea surface temperature anomalies in the Tasman Sea during late July and early August, as these drive short-term pressure systems affecting Wellington's weather. MetService forecasts released in the week prior to 11 August will provide the most actionable signal; any indication of an unusual warm front or cold snap could shift market positioning. Settlement occurs at 12:00 UTC on the resolution date, allowing traders to react to overnight and early-morning observations before the window closes.

Methodology

Methodologically this overview focuses on on-chain pricing: Polymarket's live mid comes from the Polygon conditional-token order book and settles automatically in USDC. The other three venues — Kalshi, Betfair, Manifold — sit alongside as off-chain reference points so you can see how the contract translates across regulatory and settlement regimes.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

What are crypto prediction markets?

Crypto prediction markets are on-chain smart contracts where you buy YES or NO shares on a future crypto event (e.g. "BTC above $100k by year-end"). The market price between 0¢ and 100¢ is the implied probability.

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

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%.