Highest temperature in Wellington on July 8?

Platform comparison

Market context

On 8 July 2026, Wellington International Airport will record its peak daily temperature in degrees Celsius, a figure that hinges on whether a northerly surge or persistent onshore flow dominates the day. The crowd-implied probability for any outcome above the current consensus sits at 0% YES, reflecting a market that has effectively priced in a narrow, cool band as the only realistic scenario. This zero per cent stance suggests traders view higher temperatures as virtually impossible, yet the underlying volatility in wind patterns and front timing could still create value for contrarian spots if the northerly component strengthens unexpectedly.

Historical July data frames this probability tightly: daily highs at Wellington Airport average around 54°F (12.2°C), rarely dipping below 49°F (9.4°C) or exceeding 58°F (14.4°C), with the lowest average high occurring on 12 July [4]. A recent foehn wind event off the Rimutaka Range briefly spiked temperatures on 7 July, proving that minor model differences in front timing can tip the peak between 11–13°C [5]. The market currently assigns nearly equal odds to 12°C (47%) and 13°C (40%), indicating that clearer skies or a temporary northerly could favour the upper end of this narrow range, while stronger onshore flow would cap readings near 11°C [1].

Traders should monitor real-time wind shifts and pressure trends, as the current south-south-westerly flow at 24 mph and rising pressure at 996mb suggest continued rain and cool conditions [2]. Any announcement of a northerly wind backing or a temporary lapse in onshore showers could act as a catalyst for a higher peak, though the prevailing forecast of strong winds and rain for Thursday 9 July implies limited immediate upside [2]. The resolution source, Wunderground, will capture the highest temperature across all times on the day, meaning even a brief northerly pulse could shift the outcome if it occurs before the main onshore reinforcement [1].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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

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 Who Will Win 2026. 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.

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 Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.