Highest temperature in Wellington on August 15?

Platform comparison

Market context

Wellington's maximum temperature on 15 August 2026 will be measured at the airport station and resolved against Weather Underground's Daily Observations table. The crowd currently assigns zero probability to any outcome occurring, suggesting either extreme confidence in a specific temperature band or minimal trading activity. August sits within Wellington's winter season, when daytime highs typically range between 10–13 °C, though the city's exposed location and variable weather patterns can produce outliers in either direction.

Historical August data from Wellington Airport shows that temperatures rarely exceed 15 °C during the month, with sub-zero readings possible on clear nights. The 0% implied probability across all ranges indicates the market may lack sufficient liquidity or trader participation to establish meaningful odds. This creates potential value for contrarian positions, particularly if traders believe the resolution criteria—specifically the Daily Observations table rather than summary figures—could produce unexpected results due to measurement timing or station-specific recording practices.

Traders should monitor MetService forecasts released in the days before 15 August, as Wellington's weather can shift rapidly with frontal systems moving across the Cook Strait. Recent winters have shown variable patterns, with some August days reaching 16–17 °C during anticyclonic conditions, whilst others have remained below 8 °C. The settlement window closes at midday UTC on the resolution date, meaning traders have limited time to adjust positions once actual conditions become apparent. The absence of current market depth suggests early positioning could establish significant leverage if conditions deviate from typical winter norms.

Methodology

We track Highest temperature in Wellington on August 15? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Who Will Win. 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%.