Highest temperature in Wellington on June 30?

Platform comparison

Market context

On 30 June 2026, the real-world event at Wellington International Airport will determine the highest temperature recorded in degrees Celsius, resolving a prediction market where the crowd currently assigns zero per cent probability to the “YES” outcome. In prediction markets, a YES share pays out if the event occurs, while a NO share pays out if it does not; here, the market implies the temperature will fall outside the specified range, likely landing near the historically typical 12°C.

Historical data frames this near-zero probability as sensible: June in Wellington is cool, with daily highs averaging 13°C (53°F) and rarely exceeding 16°C (61°F)[5]. While a recent heatwave saw Kelburn reach 30.3°C on an earlier date, that was an extreme outlier, not typical for late June, and the airport station usually records lower temperatures than inland sites[3]. The current 99% leading outcome of 12°C aligns with these norms, suggesting the market correctly discounts extreme deviations[1].

Traders should monitor MetService NZ’s daily forecasts and any sudden shifts in wind patterns, as coastal Wellington is highly sensitive to southerly changes that can drop temperatures sharply[7]. No major announcements are scheduled, but the settlement depends entirely on Wunderground’s recorded maximum for the day, making real-time data verification critical. The market’s 2026-06-30T12:00:00Z deadline means the final resolution will rely on the highest temperature logged before noon, with no room for post-settlement adjustments.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Wellington on June 30? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

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

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.

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 Prediction Market 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.