Highest temperature in Wellington on July 27?

Platform comparison

Market context

Polymarket currently has this contract pricing a **0%** chance of landing in the YES bucket, which means the market is effectively treating the day’s top Wellington Airport temperature as already outside every payable band in the order book. On-chain, that pricing sits on Polygon and settles in USDC through conditional tokens, so the trading question is not the weather itself but whether the final Wunderground reading for Wellington Intl Airport Station on 27 July ends up inside the specific Celsius range that resolves the market.[1]

For context, Wellington’s July temperatures are usually cool by day and colder at night, which is why the market’s live pricing can stay heavily skewed towards lower bands. Typical July averages around Wellington are about 12.7°C in the daytime and 8°C at night, with frequent rain and breezy conditions, while forecast-style pages still point to highs around 12°C rather than anything unusually warm.[2][3] That makes a high-end outcome materially less common than the colder brackets, but the contract is about the *maximum* temperature recorded at the airport station, not the daily average.[1][2]

A trader watching this market should focus on whether any updated Wellington forecasts, local sunshine breaks, or late-morning warming could push the airport station above the most crowded low-temperature ranges before the 12:00 UTC settlement window closes. The practical dependency is the Wunderground daily-history page for Wellington Intl Airport Station, because that is the resolution source and the final maximum reading there decides the contract, regardless of what broader city forecasts or general climate norms suggest.[1]

Sources: 1 · 2 · 3

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

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.

FAQ

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 Kalshi 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.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.