Highest temperature in Wellington on August 12?

Platform comparison

Market context

Wellington International Airport will record its highest temperature on 12 August 2026, with the market currently pricing all temperature ranges at zero probability on Polymarket. This contract settles against the Daily Observations table from Weather Underground rather than summary figures, a distinction that matters when intraday peaks diverge from official highs. The settlement window closes at 12:00 UTC on the day itself, creating a fixed deadline for resolution across USDC-denominated conditional tokens on Polygon.

August sits within Wellington's winter season, when mean daily highs typically range between 11–13°C. Historical data from the past decade shows that extreme heat during southern hemisphere winter is exceptionally rare; temperatures above 20°C on any August day at the airport occur in fewer than 5% of years. The 0% crowd probability reflects this seasonal reality rather than any technical barrier to resolution. Comparable winter days in Wellington rarely exceed 15°C, and the meteorological setup required for an unusual warm spell in mid-winter remains statistically improbable.

Traders monitoring this contract should track MetService forecasts released in the week preceding 12 August, particularly any unusual anticyclonic systems that might push warm air southward from the North Island. The New Zealand National Institute of Water and Atmospheric Research (NIWA) seasonal outlooks, updated monthly, provide broader context for whether August 2026 is tracking warmer than the 30-year normal. Wind patterns from the north or northeast would be the primary catalyst for any material temperature deviation, though such conditions remain unlikely during this period.

Methodology

This page reviews Highest temperature in Wellington on August 12? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Kalshi UK, which mirrors the Polymarket order book at 0% fees.

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.

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%.