Highest temperature in Wellington on June 21?

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Market context

The underlying event is the highest temperature recorded at Wellington International Airport on 21 June 2026, measured in degrees Celsius. Current crowd-implied probability sits at 0% for a "YES" outcome, suggesting the market expects the temperature to fall outside the specific range being bet on, likely due to the season’s typical chill.

Historical data frames this probability clearly: June highs at Wellington International Airport average 54–57°F (12–14°C), rarely exceeding 62°F (17°C) or dropping below 50°F (10°C) [3]. Just days ago, MetService NZ reported Wellington had already broken its record for maximum June temperature, with over 19°C recorded [4]. This anomaly, however, does not guarantee a repeat; the settlement window ends in 2026, and June 2026 forecasts still project highs between 50–59°F (10–15°C) [6], aligning with the 0% sentiment.

Traders should monitor MetService NZ announcements for extreme weather alerts, as well as Wunderground’s real-time hourly data for the airport station, which will resolve the market [2]. Any sudden shifts in funding rates or whale flows on BTC/ETH could indirectly signal macro-driven volatility affecting climate-linked contracts, though no direct crypto-catalyst is currently material. Watch for scheduled updates from the New Zealand Meteorological Service, as their forecasts often precede temperature spikes [4]. Settlement relies exclusively on Wunderground’s recorded maximum for the day, so data integrity remains the primary dependency.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reads Highest temperature in Wellington on June 21? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed for comparison. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

FAQ

Where can I trade this market with the lowest fees?

On BTC Prediction, which mirrors the Polymarket order book at 0% fees. 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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

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.