Highest temperature in Wellington on August 9?

Platform comparison

Market context

Wellington’s highest temperature on 9 August will be set by the day’s observations at Wellington Intl Airport, not by any summary high/low panel, so the key question is whether the airport gets a brief afternoon lift or stays pinned near the morning rain band. Early market pricing at 0% YES looks materially lower than the weather guidance available this morning, which points to a chilly, damp day with only a modest rebound later on: Weather Underground’s hourly forecast says “cloudy and damp with rain in the morning...then becoming sunny by afternoon” with a high of 57°F, while AccuWeather sits in the same broad range at 58–59°F, or about 14–15°C[14][3][4].

That framing matters because Wellington in August is usually stable rather than extreme. Climatology and monthly guides show typical August highs around 11–12°C, with daily highs often staying in the low-to-mid teens and only limited upside on any single day[6][8][1]. On that basis, the contract’s temperature bands should be read against a weather-market norm where a mid-teens Celsius print is ordinary, not exceptional; the spread between sportsbook-style forecasts and a zero-per-cent prediction-market price is therefore less about heat risk than about whether the airport record can clear the lower band cleanly in a breezy, showery setup[14][1][8].

For traders, the main catalyst is the actual evolution of cloud, rain and wind at the airport through late morning and early afternoon, because those factors will determine whether the daily maximum is reached before the marine layer clears or after a weak afternoon recovery. Weather Underground currently shows gusty conditions and a morning-rain-then-sunny pattern, which is consistent with a narrow trading range rather than a sharp upside move; AccuWeather also flags rain and drizzle in the morning before decreasing cloud later[14][3]. The contract’s settlement source is the Daily Observations table, so intraday movement in the airport record matters more than headline forecast highs, especially if the peak temperature arrives briefly and is not mirrored in summary widgets[7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on August 9? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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.

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.

Do I need to KYC for this market?

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