Highest temperature in Wellington on July 23?

Platform comparison

Market context

At Wellington Airport, the day’s **maximum temperature** is the settleable event, with the official reading taken from the Wunderground history page for NZWN and converted into the market’s Celsius range at the end of the window. The crowd price at **0% YES** implies the market is treating a qualifying high as very unlikely, which is the kind of setup a programmatic trader would usually sanity-check against the live forecast trend, the remaining daylight hours, and the exact range boundaries rather than the headline number alone.

For context, Wellington’s summer-autumn shoulder season is often driven by rapid wind shifts, cloud cover, and marine air, so the hourly maximum can be materially different from nearby inland locations. In a rules-based workflow, the key comparison is not today versus a broad seasonal average, but the forecast peak for Wellington Airport specifically versus the market’s bracket structure: a one-degree miss can flip the outcome if the distribution is concentrated near a threshold. With no search results provided here, I cannot ground the historical comparison in a recent sourced climatology, but the practical read is that this market is highly sensitive to the exact afternoon peak, not the morning trend.

A trader watching catalysts would focus on MetService forecast updates, the timing of any sea-breeze change, and whether cloud or wind suppresses the warmest hour before the settlement cutoff. For bots, the useful inputs are the forecast hourly maximum, the station-specific observation feed, and any late revisions to the expected high; conditional orders can be keyed to forecast updates if the predicted peak moves across a range boundary.

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.

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 Fees. 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 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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Kalshi Fees trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.