Highest temperature in Wellington on July 28?

Platform comparison

Market context

Polymarket prices this contract at **0% YES**, so the market is effectively saying there is no meaningful chance that Wellington’s airport reaches the relevant temperature band on 28 July. On Polymarket, that means traders are posting USDC against conditional tokens on Polygon around a very specific settlement rule: the highest temperature recorded at Wellington Intl Airport Station, as reported by Wunderground, not a citywide average or a forecast headline.

That zero-implied price sits against a winter climatology that is usually cool rather than warm. Independent forecast and climate pages put Wellington’s July daytime highs around **11-12°C**, with current outlooks showing highs near **12°C** and a cool night around **5°C**, alongside frequent wind and rain risk.[1][3][4] BBC Weather currently shows Wellington at **10°C** with steady pressure, which is consistent with a late-July setup that makes a sharp warm spike less likely.[2]

For a trader, the main watchpoints are the airport station’s actual noon-to-afternoon warmth, not the broad city forecast, because a brief sunnier or drier spell can lift the day’s maximum even in a cool pattern. The key dependencies are the daily synoptic setup over Cook Strait, cloud cover, wind direction, and whether rain bands clear earlier than expected; on a market like this, the final print from Wunderground matters more than any single forecast model.

Sources: 1 · 2 · 3 · 4

Methodology

We track Highest temperature in Wellington on July 28? 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.

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 PolyGram. 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.

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 reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.