Highest temperature in Wellington on June 30?

Platform comparison

Market context

The underlying event is the daily peak temperature recorded at Wellington International Airport on 30 June 2026, measured in degrees Celsius and resolved via Wunderground data. This specific date falls in mid-winter, a period where Wellington’s highs typically cluster between 11°C and 14°C, with 12°C and 13°C being the most frequent outcomes historically[3]. Current market data shows a stark divergence: while the crowd-implied probability for a “YES” outcome sits at 0%, Polymarket traders are overwhelmingly pricing 12°C at 99% confidence, with 13°C at just 1%[1]. This suggests the market is not betting on an extreme heatwave but rather on the statistical median for this season, contrasting with analyst consensus that often flags winter variability as a key risk factor.

Traders should monitor real-time weather bulletins from NIWA, particularly any announcements regarding unseasonal warmth or cold fronts approaching the Tasman Sea, as these directly influence peak temperatures. Recent reports indicate Wellington has experienced an exceptionally warm start to winter, with temperatures running approximately 3°C above normal, though the highest recorded temperature this season was 22.8°C in Hastings, not Wellington[2]. The primary catalyst remains the daily synoptic forecast for the Wellington region, which dictates cloud cover and wind patterns; clear skies and light winds could push temperatures toward the upper end of the typical range, while overcast conditions with strong southerlies would keep them near 11°C. No major scheduled events or policy announcements are expected to alter local weather patterns, making atmospheric dynamics the sole dependency for settlement.

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

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.

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.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.