Highest temperature in Wellington on August 17?

Platform comparison

Market context

On 17 August 2026, the highest temperature recorded at Wellington International Airport will fall into one of several defined ranges, measured in degrees Celsius via the Daily Observations table on Weather Underground. The market currently prices all temperature outcomes at 0% probability on Polygon, reflecting either a technical settlement or extreme illiquidity in the conditional token pairs denominated in USDC. This disconnect suggests traders have either exited positions entirely or the market infrastructure requires fresh liquidity before meaningful price discovery occurs.

Wellington's August climate sits firmly in the Southern Hemisphere winter, with historical daily maxima typically ranging between 11–14°C at the airport station. The 0% crowd probability likely reflects the market's nascent state rather than genuine certainty about temperature outcomes. August 2025 data from the New Zealand MetService showed Wellington experiencing temperatures between 8–15°C across most days, with occasional highs reaching 16–17°C during warmer spells. These historical patterns establish the baseline against which traders should calibrate their position sizing and range selections.

Traders monitoring this contract should track MetService's medium-range forecasts released in early August 2026, which typically provide reliable guidance five to ten days ahead. Any significant anticyclonic systems moving across the lower North Island could elevate temperatures above the historical mean, whilst southerly outbreaks would suppress them. The settlement window closes at 12:00 UTC on 17 August, creating a hard deadline for resolving against the Weather Underground Daily Observations table—the specified primary source that supersedes summary figures in case of discrepancies.

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 Kalshi UK, which mirrors the Polymarket order book directly.

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 Kalshi UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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%.