Highest temperature in Wellington on June 30?

Platform comparison

Market context

The real-world event concerns the highest temperature recorded at Wellington International Airport on 30 June 2026, measured in degrees Celsius and resolved via Wunderground data. With the crowd-implied probability for a specific temperature range sitting at 0% YES, the market currently reflects extreme scepticism that any notable heat anomaly will occur, likely due to the typical winter conditions in New Zealand.

Historical data frames this probability sharply: June at Wellington International Airport sees average daily highs drop from 57°F to 54°F (roughly 14°C to 12°C), with overcast skies dominating 42% of the time[3]. While MetService recently noted Wellington beat its record June maximum with over 19°C recorded earlier in the month[5], such spikes are rare outliers against the prevailing 11°C to 14°C baseline seen in recent 24-hour summaries[4]. Programmatically, a trader would script a conditional order to short any range above 16°C, as the statistical weight heavily favours temperatures below 15°C.

Traders must monitor the MetService NZ forecast updates and the National Weather Service time-series for sudden shifts in wind direction or pressure, which could trigger unseasonal warmth[2]. The primary catalyst is the South South Westerly wind currently blowing at 24 mph, which typically suppresses temperatures, though a shift to northerly flow could elevate highs[1]. No major announcements are scheduled, but the dependency on Wunderground’s daily resolution means any data gap or latency could delay settlement, requiring automated bots to verify source integrity before executing trades.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on June 30? 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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

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'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 Polymarket App UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.