Highest temperature in Wellington on August 12?

Platform comparison

Market context

Wellington's maximum temperature on 12 August 2026 will be recorded at the airport weather station and resolved against the Daily Observations table on Weather Underground. The crowd currently assigns zero probability to any outcome, suggesting either extreme confidence in a particular temperature range or insufficient liquidity to establish meaningful pricing across the full distribution.

August sits within Wellington's winter season, when daily highs typically range between 10–13°C, though the city's exposed location and variable weather patterns can produce outliers. Historical data from recent Augusts shows occasional days reaching 15–16°C during anticyclonic systems, whilst cold southerly outbreaks occasionally suppress maxima below 8°C. The 0% implied probability across all ranges reflects the market's nascent state rather than genuine certainty about conditions two years forward. Seasonal climatology suggests mid-range temperatures (11–13°C) carry the highest frequency, yet the resolution mechanism's specificity—requiring exact Daily Observations data rather than summary figures—introduces operational risk that may deter early traders unfamiliar with Weather Underground's station protocols.

Traders should monitor Wellington's longer-range weather patterns as August 2026 approaches, particularly the phase of the Southern Annular Mode and sea surface temperature anomalies in the Tasman Sea, which influence winter pressure systems affecting the region. MetService's seasonal outlooks, released quarterly, will provide guidance on whether the austral winter leans towards warmer or cooler conditions. The market's current flatness presents opportunity for those confident in specific temperature clustering, though the two-year settlement window means conviction trades face extended capital lock-up.

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 Who Will Win, 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

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.

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%.