Highest temperature in Wellington on June 30?

Platform comparison

Market context

The real-world event in question is the highest temperature recorded at Wellington International Airport in New Zealand on 30 June 2026, measured in degrees Celsius. While the current crowd-implied probability for a specific outcome on one platform sits at 0%, a stark divergence exists across the prediction market ecosystem. On Polymarket, traders have assigned a 68% probability to a maximum of 12°C, with 13°C as the next likely outcome at 23%[1]. This contrasts significantly with the zero-implied probability on the other contract, suggesting a meaningful disconnect in how different platforms interpret the same weather contract, rather than a consensus on the event being impossible.

Historical data frames this probability against typical June conditions where daily highs in Wellington, New Zealand, decrease from 56°F to 53°F, rarely exceeding 61°F[5]. However, recent records show Wellington has already beaten its maximum June temperature, with over 19°C recorded in early June, and the Kelburn station reaching an all-time maximum of 30.3°C during a recent heatwave[3][6]. These precedents indicate that while 12°C is statistically probable based on averages, the potential for higher temperatures remains a tangible risk that the 0% probability on one platform fails to capture, unlike the more nuanced pricing on Polymarket.

Traders should monitor the MetService NZ weather bulletins and the upcoming Wunderground daily history release for the Wellington Intl Airport Station, which serves as the official resolution source[1]. Any sudden shifts in southerly wind patterns or cloud cover could alter the temperature trajectory, as seen in the 2013 record southerly gust of 37.1 m/s which coincided with specific temperature extremes[7]. The key dependency is the final daily reading on 30 June, and analysts must watch for real-time updates from MetService NZ, which has already flagged record-breaking conditions for the region[6]. The settlement window closes at 12:00 UTC on 30 June 2026, making the final hours of data critical for validating the 12°C frontrunner on Polymarket against the zero-implied view elsewhere.

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 Best Prediction Markets 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

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 Best Prediction Markets UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.