Highest temperature in Wellington on June 21?

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Market context

Polymarket is pricing this Wellington Airport temperature contract at **0% YES** right now, which means the market is effectively saying there is no chance the airport’s highest recorded temperature on 21 June will land in the contract’s YES range. The event resolves from the highest temperature logged at Wellington Intl Airport Station in Celsius on the day, with settlement based on Wunderground history data rather than local headlines or citywide readings.

For context, Wellington is normally a cool June market: long-run June averages at Wellington International Airport sit around the mid-teens Celsius for daily highs, with average highs near 54–57°F and frequent cloud cover[3][5]. The live setup at the airport is not especially warm either, with BBC Weather showing 15°C, 24 mph south-south-westerly winds and a Sunday forecast of thundery showers[1]. A recent MetService post also noted Wellington had already beaten its maximum June temperature on record earlier in the month, which is a reminder that one outlier warm spell can matter even in winter[4].

For a Polymarket user, the practical watchpoints are the airport’s intraday observations on Wunderground and any short-lived warm surge before the settlement window closes, not the broader city forecast. Since these contracts are held and settled on-chain with USDC on Polygon via conditional tokens, the key question is whether the final airport maximum is likely to stay in the colder band despite any brief clearing or wind shifts. NOAA’s current NZWN feed showed mostly cloudy conditions with a south-south-westerly breeze at 0130 UTC, which fits a low-warmth baseline rather than a breakout heat setup[6].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on June 21? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Is this market available outside the US?

Kalshi UK is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Kalshi UK triggers a quick verification flow that finishes in 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.