Highest temperature in Wellington on August 8?

Platform comparison

Market context

Polymarket has this contract pinned at **0% YES** today, so the market is treating a 8 August Wellington high in the relevant Celsius band as effectively absent from the tape. The contract settles in USDC on Polygon through conditional tokens, and the key point for users is that the outcome will be read from Weather Underground’s **Daily Observations** table for Wellington Intl Airport, not the headline day-high summary.

For context, Wellington’s August climate is usually cool rather than extreme. Long-run August averages cluster around about **12°C** for highs and **9°C** for lows, with WeatherSpark describing daily highs as typically around 54°F and rarely above 59°F, while other climatology pages put the monthly average high near 12–13.6°C.[9][10][17][19][2] That means the contract is mostly about whether a normal late-winter day reaches the upper end of the usual range. The recent price of zero suggests traders are either discounting the chance of a qualifying reading or waiting for the final Weather Underground observation to remove ambiguity.

The practical catalysts are the live observation cycle and any late-day temperature spike before Weather Underground’s daily table closes out for the settlement window. Wellington weather this month is often shaped by changeable winds and rain rather than heat, so a brief sunny interval can matter more than the day’s average conditions.[10][12] The main dependency for holders is the exact station record on Weather Underground; if the Daily Observations table and the summary panel disagree, the table controls resolution, so traders should watch for the highest listed Celsius value at Wellington Intl Airport rather than the broader site headline.[16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on August 8? 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

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

UK Frequently Asked Questions

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.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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%.