Highest temperature in Wellington on June 30?

Platform comparison

Market context

On 30 June 2026, the Wellington International Airport Station will record its highest temperature in degrees Celsius, a real-world event that currently sees the market pricing a 12°C outcome at 99% probability, with 13°C trailing at just 1% [1]. This extreme consensus implies a near-zero chance of the temperature exceeding the 12°C threshold, effectively rendering the "YES" outcome for higher ranges as a 0% probability event in the current Polymarket contract [1].

Historical data frames this tight pricing against Wellington’s typical June climate, where daily highs average between 53°F and 56°F (12°C to 13°C), rarely exceeding 61°F (16°C) [5]. While recent records show Wellington (Kelburn) hitting 30.3°C during a heatwave, such extremes are outliers rather than norms for late June, and the airport station typically records slightly lower figures than the city centre [4]. The current market view aligns with the statistical probability that a standard winter day will not breach the 12°C mark significantly, making the 12°C outcome the overwhelming frontrunner [1].

Traders should monitor the MetService NZ weather bulletins for any unexpected southerly shifts or heatwave announcements, as these are the primary catalysts for temperature deviations [7]. Although a record-breaking 19°C was recorded on 1 June, the seasonal trend shows temperatures decreasing by 3°F as June progresses, reducing the likelihood of a late-month spike [5]. The settlement depends entirely on Wunderground data for the airport station, so any discrepancy between city-centre and airport readings could invalidate speculative bets on higher ranges, reinforcing the current on-chain consensus [1].

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

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 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 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 Kalshi UK 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.