Highest temperature in Wellington on August 16?

Platform comparison

Market context

On 16 August 2026, Wellington International Airport will record a maximum temperature in Celsius, with traders on Polymarket currently pricing all temperature ranges at zero probability across the board. This flat pricing reflects the market's nascent state rather than conviction about the event itself; the contract settles based on the Daily Observations table from Weather Underground, a distinction that matters because discrepancies between that granular dataset and the summary "Day High & Low" section will resolve in favour of the more detailed record.

Wellington's August climate sits firmly in the Southern Hemisphere winter, with historical August highs averaging around 12–13°C at the airport station. The 0% crowd probability across all ranges suggests either minimal trading activity or a technical issue with market initialisation rather than genuine uncertainty about whether temperatures will occur. Comparable winter days in Wellington rarely exceed 15°C, and sub-5°C highs are uncommon but not unprecedented; the range structure of this market will determine which specific band captures the eventual settlement value.

Traders monitoring this contract should track MetService forecasts released in the week preceding 16 August, as New Zealand's national weather service provides the most reliable guidance for Wellington conditions. Any unusual anticyclonic systems or cold fronts moving across the lower North Island could shift outcomes materially. The settlement window closes at 12:00 UTC on the day itself, giving traders a narrow window to react once the airport's official observation is recorded and published to Weather Underground's Daily Observations table.

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

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

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.

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.

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%.