Highest temperature in Wellington on August 17?

Platform comparison

Market context

Wellington International Airport's daily maximum temperature on 17 August 2026 will be recorded via Weather Underground's Daily Observations table, with settlement in USDC against the specific temperature range that captures the highest reading in degrees Celsius. The market currently shows 0% implied probability, suggesting traders expect the actual high to fall outside the upper boundary of the highest available range bracket.

August is Wellington's late winter month, with historical daily maxima typically ranging between 11–13 °C at the airport station. The 0% crowd reading indicates confidence that the day's peak will remain well below whatever ceiling the uppermost range represents. Comparable August days at Wellington Intl show consistent clustering in the 10–14 °C band; extreme outliers above 16 °C are exceptionally rare in winter, occurring perhaps once per decade. The settlement window closes at 12:00 UTC on 17 August, giving traders a hard deadline aligned with standard meteorological observation cycles.

Traders should monitor the Southern Oscillation Index and sea surface temperature anomalies across the Tasman Sea in the weeks preceding the event, as these drive Wellington's winter weather patterns. MetService forecasts released in early August will provide the most actionable signal; any prediction of unseasonably warm conditions would shift the probability away from the current consensus. Real-time atmospheric pressure and wind direction data from NIWA will clarify whether a warm front is approaching the region, though such events remain statistically uncommon during this period.

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

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.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.