Highest temperature in Wellington on June 30?

Platform comparison

Market context

The real-world event is the highest temperature recorded at Wellington International Airport on 30 June 2026, measured in degrees Celsius. Current crowd-implied probability sits at 0% for any outcome above the baseline, with the market overwhelmingly favouring the 12°C range as the frontrunner at 100% probability[1]. This consensus treats the day as a typical late-June winter day, yet historical data reveals a contrarian angle: Wellington has already experienced an exceptionally warm start to winter, with temperatures running approximately +3°C above normal across the city[7]. Furthermore, the MetService confirmed that Wellington recently beat its maximum June temperature on record, surpassing 19°C earlier in the month[9], suggesting the 0% probability for higher ranges may be mispricing the value of this anomalous warmth.

Traders should watch for immediate meteorological dependencies, specifically the forecast of gales and heavy rain expected today, which could suppress temperatures significantly[8]. However, the catalyst for a contrarian bet lies in the lingering heatwave pattern; if the overcast conditions clear or the wind shifts, the residual warmth from the record-breaking start to winter could push temperatures higher than the consensus 12°C. The value spot likely sits in the 13°C to 16°C ranges, which currently hold negligible probability but are supported by the recent record of 19°C[9]. While the 6°C or below outcome is priced at 0%[1], the historical average high for June decreases from 57°F to 54°F, indicating that a drop below 10°C is plausible but the record-breaking warmth makes a higher spike the more intriguing underdog play[6]. The market’s rigid fixation on 12°C ignores the volatility introduced by this unseasonal heat, creating a potential mispricing for traders willing to bet against the crowd.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Who Will Win, which mirrors the Polymarket order book directly.

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 Who Will Win. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

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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 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.