Highest temperature in Wellington on August 11?

Platform comparison

Market context

Polymarket is pricing this Wellington airport temperature contract at **0% YES** today, which means the market is effectively assigning no chance that the highest reading recorded in the settlement window lands in the listed Celsius band. Because the contract settles against the **Daily Observations** table on Weather Underground for Wellington Intl Airport Station, the relevant print is the highest observed temperature on 11 August 2026, not the broader day-high summary. The payout is handled in the usual Polymarket structure: USDC on Polygon, with conditional tokens resolving into the temperature range that matches the final observation.

For context, Wellington’s August climate is cool and tightly clustered. Long-run datasets put the month’s average maximum near **12–13°C**, with daily highs usually in the low teens and rare excursions much above the mid-teens; one climatology shows an August mean maximum of **12.9°C** and another source gives an average high of **13.6°C**. Weather Underground’s recent Wellington history already shows August highs mostly in the low-to-mid teens Fahrenheit equivalent, with early-August readings such as **52°F, 54°F and 61°F** on successive days, which reinforces how narrow the distribution tends to be.[16][2][8]

The main catalysts are operational rather than political: the timing and exact values of the station observations, any late updates to the Daily Observations table, and whether Weather Underground posts a clean final high for the airport site before the settlement cutoff. Traders should also watch forecast revisions from local forecasters such as NIWA and AccuWeather, since a brief warm spell can move a daily high into a higher bracket even in a typically cool month. In practice, the market will only care about the airport station’s observed maximum within the settlement window, so a small intra-day temperature spike matters more than the broader Wellington forecast.[19][18][3]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Wellington on August 11? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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 Kalshi 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.

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%.