Highest temperature in Wellington on August 4?

Platform comparison

Market context

Polymarket is pricing this Wellington temperature contract at **0% YES** today, which means the market is effectively saying there is no live expectation that the day’s highest reading at Wellington Intl Airport Station will land in the contract’s YES bucket. Because settlement is tied to the *maximum* temperature recorded on 4 August 2026 at NZWN, the key practical question for traders is not the general forecast but whether the official high slips into the specified Celsius range before the settlement window closes, with outcomes resolved from the Wunderground history page and paid in USDC via Polygon conditional tokens.

The background case for reading that price is Wellington’s winter climatology: August is typically cool, with average highs around **11–12°C** and lows around **8–9°C**, and multiple forecast services have been pointing to a range near that band for early August rather than any pronounced warmth. Recent daily forecasts for Wellington have shown highs around **9–13°C** and frequent cloud, rain, and wind, which supports the idea that extreme upside in the day’s maximum is structurally limited. In historical terms, the contract only needs one brief spike to clear a threshold, but Wellington’s coastal winter profile usually keeps the distribution tightly clustered.

What matters now is the short list of catalysts that can move the implied probability: updated airport observations through the morning and early afternoon UTC, any change in local wind direction or sunshine that allows a sharper midday peak, and the exact Wunderground airport reading used at resolution. Traders on Polymarket should watch the live NZWN observation feed and compare it with nearby forecast updates from services such as BBC Weather, Met Office, and local providers; if the day stays near the current 8–12°C guidance, the market is likely to remain pinned close to zero.

Sources: 1 · 2 · 3 · 4 · 5

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 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.