Highest temperature in Wellington on July 20?

Platform comparison

Market context

The market tracks the peak temperature recorded at Wellington International Airport on 20 July 2026, a date that falls in the heart of the Southern Hemisphere’s winter. Current live data from BBC Weather shows the airport is experiencing 15°C with strong south-south-westerly winds and 72% humidity, conditions typical for mid-winter in the region [1]. The crowd-implied probability of 0% for a “YES” outcome on any high-temperature threshold suggests the market has already locked in a specific, low range as the definitive result.

Historical winter peaks in Wellington rarely exceed 18°C, with most days clustering between 8°C and 14°C. The current frontrunner on Polymarket is 12°C at 100% probability, indicating the crowd has converged on a value well within the normal winter band [2]. This near-certainty aligns with the absence of any heatwave forecasts or anomalous atmospheric patterns for the day, making extreme deviations from 12°C statistically negligible.

For a programmatic trader, the key dependency is the Wunderground daily history feed for NZWN, which serves as the sole resolution source. Since settlement ends at 12:00 UTC on 20 July 2026—just one hour from now—there are no pending catalysts or announcements to monitor. The market’s 100% assignment to 12°C means any bot executing conditional orders should treat this as a settled outcome rather than a live trade, focusing instead on verifying the final Wunderground entry against the predicted value.

Sources: 1 · 2

Methodology

We track Highest temperature in Wellington on July 20? 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 Polymarket Bot UK. 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.

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.