Highest temperature in Wellington on July 7?

Platform comparison

Market context

On 7 July 2026, Wellington International Airport will record its highest daytime temperature in degrees Celsius, a real-world event that determines the outcome of a prediction market currently implying zero probability for the "YES" outcome. This near-certain dismissal suggests the market expects the temperature to fall outside a specific narrow range, likely anchored around 14°C, which aligns with the crowd’s pricing on Lines.com where the "exactly 14°C" option trades at $0.50[3].

Historically, July in Wellington is cool, with daily highs averaging around 54°F (12.2°C), rarely exceeding 58°F (14.4°C) or dropping below 49°F (9.4°C)[7]. The warmest day in early July typically reaches 17.8°C, but this is an outlier; most days hover near average or below, with NIWA forecasting temperatures equally likely to be near or below average for May–July 2026, and occasional cold snaps possible under persistent high pressure[1]. Given this pattern, a 0% implied probability for a specific high temperature is consistent with the climate’s variability and the low likelihood of hitting an exact degree.

Traders should monitor real-time weather updates from BBC Weather and the National Weather Service, which currently report light rain, a moderate southerly breeze, and a temperature of 13°C at 8 AM on 7 July[2][6]. Any shift in wind direction or cloud cover could influence the peak temperature, but the prevailing cool, damp conditions support the market’s scepticism. The settlement window ends at 12:00 UTC on 7 July, so the final reading will depend on the afternoon’s thermal trajectory, which remains uncertain but historically constrained[1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on July 7? 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

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

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.

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.

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?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Best Prediction Markets UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.