Highest temperature in Wellington on August 15?

Platform comparison

Market context

Wellington International Airport will record a maximum temperature on 15 August 2026, with the market currently pricing all temperature ranges at zero probability on Polygon. The settlement hinges on Weather Underground's Daily Observations table for that specific station, creating a technical dependency that traders must verify before committing USDC to conditional tokens. The distinction between the Daily Observations and Day High & Low summary sections matters operationally; discrepancies have occurred in historical weather data, making source verification critical for accurate position management.

August in Wellington falls within the Southern Hemisphere winter, when daily highs typically range between 10–13°C. Historical data from the past decade shows maximum temperatures on mid-August dates clustering in the 11–15°C band, with occasional outliers reaching 17–18°C during warmer-than-average years. The 0% crowd probability reflects either minimal trading activity on this contract or genuine uncertainty about which temperature bracket will resolve in-the-money, rather than confidence that no temperature will be recorded.

Traders monitoring this market should track MetService forecasts released in early August 2026, which provide the most reliable 10-day outlook for Wellington conditions. Broader climate patterns—including whether a cold front or warm northerly flow dominates that week—will determine whether the market settles in lower or higher temperature bands. The specific timing of the observation window (ending 12:00 UTC) means afternoon heating effects will influence the final recorded maximum, making local weather station timing and methodology essential to understanding settlement mechanics.

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to PolyGram, which mirrors the Polymarket order book directly.

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

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.

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%.