Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Scam?) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Place a position → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Place a position → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Place a position → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Place a position → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Place a position → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 13°C | 100% |
| 7°C or below | 0% |
| 8°C | 0% |
| 9°C | 0% |
| 10°C | 0% |
| 11°C | 0% |
| 12°C | 0% |
| 14°C | 0% |
| 15°C | 0% |
| 16°C | 0% |
| 17°C or higher | 0% |
Market context
Polymarket is pricing this **Wellington temperature** contract at **0% YES** today, so the market is effectively treating an outcome in the listed Celsius band as a near-vanishingly small event. The contract settles off the **highest temperature in Weather Underground’s Daily Observations table** for Wellington Intl Airport Station on 8 August 2026, and the on-chain position is still just a USDC-backed conditional token on Polygon until the window closes. AccuWeather’s August forecast for Wellington, New Zealand shows daily highs of about **53°F to 60°F** and an average August high of **56°F**, which is roughly **12°C to 16°C** and broadly consistent with a low-temperature winter setup rather than an outlier heat spike.[1][8]
For context, Wellington’s August climate is usually capped by maritime conditions and frequent rain, so a very high Celsius reading would need a sharp, short-lived warm episode rather than a normal forecast day. Comparable market logic from prior Wellington temperature contracts is that the displayed “day high” is less important than the intraday observation actually logged in the station table, which can differ by a fraction of a degree and determine which bracket resolves.[13] That matters for Polymarket users because the token pays only if the recorded maximum lands inside the exact range, not if the weather merely feels warm or the summary page prints a higher figure.
The main catalysts are the live Weather Underground feed and any late-day temperature swing before the 12:00 UTC settlement cut-off, especially around local afternoon warmth and coastal wind changes. The current Wunderground station page shows Wellington conditions being updated in real time, which is the data stream that can move the contract if the observed high nudges across a bracket boundary.[7] Traders also need to watch for any forecasting updates from major forecasters such as AccuWeather, because even a modest revision in the expected high can matter when the market is already pinned near zero.[1][8]
Methodology
This page reviews Highest temperature in Wellington on August 8? 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 Scam?, 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
- 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%.
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