Highest temperature in Wellington on August 9?

Platform comparison

Market context

Wellington’s temperature on 9 August will be settled from the **highest reading in Weather Underground’s Daily Observations** for Wellington Intl Airport Station, so the key variable is the intraday peak rather than the summary high/low badge. In practice, that means a trader tracking this programmatically should poll the station’s observation feed through the day, store the maximum Celsius value seen, and map it to the market’s payout band before the 12:00 UTC settlement cut-off.

The current **0% YES** crowd price implies the market is treating a qualifying reading as extremely unlikely, but comparable August forecasts for Wellington point to cool, unstable conditions rather than heat. Weather sources for Wellington, New Zealand show daytime maxima around the low teens Celsius, with forecasts of roughly 12–13°C, rain or drizzle, and breezy to windy conditions; BBC and Met Office-style outlooks also describe cloud, rain and temperatures around 13–15°C, which is consistent with a low chance of reaching higher bands. [2][5][11][16]

For a power-user, the main catalysts are not press events but forecast updates and observation timing. The useful dependencies are the next model refresh, any shift in wind or rain timing, and the first live station readings after local morning, because a brief spike can matter more than the day’s average. A recent Wellington forecast from AccuWeather still shows only a modest high near 57–59°F, with morning rain and drizzle easing later, which supports a banded approach: watch whether the station ever touches the upper end of the current forecast envelope, then auto-hedge or place conditional orders if the observed maximum crosses into the next range. [3][5][6][13]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on August 9? 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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 Polymarket Bot UK. 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%.