Highest temperature in Wellington on August 11?

Platform comparison

Market context

Wellington’s airport temperature on 11 August is usually a low-variance winter reading, with August normals clustered around a mean maximum of about 12.9°C and a daily range that often leaves the midday peak in the low teens rather than far above it.[6][19] That matters for this contract because the settlement is tied to the **highest temperature in the Daily Observations table** at Wellington Intl Airport Station, so a power user would focus on the intraday max rather than the headline “day high” summary. Weather Underground’s history pages show the hourly-style observation table alongside a separate high/low summary, which is exactly the kind of setup where programmatic monitoring should query the row-level observations and not rely on the summary field alone.[15][18]

The current 0% yes price is notably below the climatological centre of gravity. Comparable August data point to a very ordinary outcome around 12°C, with neighbouring 11°C and 13°C bins often plausible when the weather is settled or slightly milder than average.[1][6] For a trader using bots or conditional orders, the practical edge is in watching whether the airport site posts a late-afternoon uplift, because Wellington’s maritime regime can hold temperatures flat for much of the day, then briefly nudge higher if cloud breaks or northerly flow strengthens. The market only needs the top printed observation by the settlement cut-off, so a script checking the Weather Underground history page before the window closes is the relevant workflow.[15][18]

The main catalysts are the synoptic setup over New Zealand and any short-term forecast updates from the MetService or similar national forecasts, because those shape whether the airport gets a mild, sunny burst or remains locked in winter cloud and drizzle.[6] In practical terms, a trader should monitor the day’s forecast range, the timing of any front passage, and whether the airport observations are updating cleanly; if there is a discrepancy between the summary and the observations table, the market rules make the table decisive.[15][18]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Wellington on August 11? 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 Polymarket Review UK, which mirrors the Polymarket order book at 0% fees.

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 Review 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%.