Highest temperature in Wellington on August 6?

Platform comparison

Market context

Wellington is starting the day near its usual August pattern: cool, windy, and only modestly warmed by midday. The latest short-range guidance points to temperatures around 10–13°C, with cloud and a fresh southerly or northerly flow keeping the air mass stable rather than heat-building, which is consistent with the airport station’s typical winter climate. [8][9][15][16]

That makes the market’s current 0% yes price understandable, because Wellington airport’s August temperatures are normally well below any hot-day thresholds and the forecast range is clustered tightly in the low teens. Comparable August climatology for Wellington points to average highs around 11–12°C and lows near 8–9°C, so the main historical comparison is not to summer spikes but to whether a brief clear-sky window can lift the day above forecast norms. [3][6][7]

For traders, the key catalysts are any change in the wind forecast, cloud cover, or rain timing before the settlement window closes, since stronger winds and marine air usually cap the daytime maximum at the airport. The resolution depends on the highest temperature recorded at Wellington Intl Airport Station on Wunderground, so intra-day updates matter more than broad regional forecasts; if skies clear or winds ease, the ceiling can rise a few degrees, but the current setup still favours a cold, narrow range. [8][13][15][18]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Prediction Today. 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%.