Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Polymarket Review UK) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Trade this market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Trade this market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Trade this market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Trade this market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Trade this market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 15°C | 100% |
| 7°C or below | 0% |
| 8°C | 0% |
| 9°C | 0% |
| 10°C | 0% |
| 11°C | 0% |
| 12°C | 0% |
| 13°C | 0% |
| 14°C | 0% |
| 16°C | 0% |
| 17°C or higher | 0% |
Market context
The event is the highest recorded **air temperature at Wellington International Airport** on 10 August 2026, with settlement tied to the **Daily Observations** table on Weather Underground rather than the summary “Day High & Low” panel. For a programme-like workflow, the cleanest approach is to poll the history page near and after the settlement window, extract the day’s maximum from the table, and map that value into the market’s Celsius bucket; the relevant uncertainty is not the day’s trend, but whether the final table entry is revised before the window closes.
Wellington’s August climate is normally cool and fairly compressed, with average highs around **12°C** and typical daily highs around **54°F/12°C** rather than summer-like extremes.[1][4][12] Weather Underground’s historical August pages for Wellington show recent daily highs mostly in the low-to-mid 50s °F, with one early-August 2026 day reaching **61°F** (about **16°C**), which is a useful reminder that a single mild burst can push the day into a higher bucket even when the monthly norm is subdued.[7] Against that backdrop, a **0%** crowd-implied YES looks like a stale or mispriced signal rather than a strong weather view; the more relevant question for a trader is whether the observed day ends up near the lower-teens Celsius band that Wellington produces most often in August.
The practical catalysts are the local weather sequence through the day, especially any front, wind shift, or brief sunbreak that can lift the airport maximum by a degree or two. Wellington is known for changeable conditions and wind, so a model driven by hourly updates should watch the airport observation stream and not rely on generic city forecasts; AccuWeather’s August 2026 outlook, for example, clusters daily highs around **50° to 60°F**, which keeps the centre of mass in the low-to-mid teens Celsius.[17] For automated monitoring, the main dependencies are Weather Underground’s update cadence, the airport station identifier, and the exact bucket boundaries in the contract, since a one-degree difference can change the settled range.
Methodology
Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.
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
- 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.
- 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%.
Trade Highest temperature in Wellington on August 10? on Polymarket Review UK
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