Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Who Will Win) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Live odds → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Live odds → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Live odds → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Live odds → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Live odds → |
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
Wellington’s airport is priced as a **cold-weather, low-ceiling** outcome rather than a summer-style spike, with the market implying **0% YES** for a higher temperature band and the live forecast sitting around **12°C to 14°C** for the day. That makes the favourite the lower brackets, with the main question being whether the station merely tops out in the low teens or briefly tags a slightly warmer reading before cloud and wind shut the lid on the afternoon. Forecasts from AccuWeather, WeatherWatch and other services point to cloudy conditions, a breezy northerly flow and some rain, all of which lean against a late-day temperature surge.[2][3][6]
Historically, Wellington in August is a fairly tight range city: long-run climate references put average highs near **12°C to 13°C**, with daily highs often clustering in the mid-teens Fahrenheit-equivalent and only limited upside beyond that. WeatherSpark describes August highs around **54°F** and rarely above **59°F**, while AccuWeather’s month view shows forecast highs mostly between **53°F and 60°F**. For handicap purposes, that supports the consensus on the under side and suggests any value on the contrarian over would need a genuine forecasting miss, not just a small afternoon lift.[1][10][16]
The key catalyst is the **Wunderground Daily Observations** feed for Wellington Intl Airport, because that is the settlement source and it overrides the summary high/low panel if the two diverge. Traders should watch the timing of the first warm-up after sunrise, any brief clearing, and whether rain arrives early enough to cap the day’s maximum; AccuWeather and Wunderground both show rain and cloud pressure on the temperature profile, which matters more than the headline daily high. In a market already at **0% YES**, the only realistic value spot is a tiny contrarian position on a station observation landing above forecast if the north wind mixes warmer air through the late morning.[2][11][15]
Methodology
We track Highest temperature in Wellington on August 8? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.
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
- 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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