Highest temperature in Wellington on July 21?

Platform comparison

Market context

Wellington is experiencing a brisk, cloud-heavy July day with temperatures hovering near 12°C, reinforcing the market’s 0% probability that any higher range will be hit. Current readings from the Wellington International Airport show 12.2°C with strong northerly winds gusting to 43km/h, creating a cooling effect that suppresses peak warmth [5]. This aligns with the crowd’s certainty that the day’s maximum will not exceed 12°C, as the frontrunner outcome in the market is precisely that figure at 100% probability [2].

Historically, mid-July highs in Wellington rarely breach 14°C, with most days clustering between 10°C and 13°C under similar wind and cloud conditions. The 2026 past weather data for Wellington shows a consistent pattern of cool, dry days with dew points around 45°F and humidity near 82%, limiting solar heating potential [3]. Given today’s pressure is rising at 996mb and winds remain strong from the south-southwest, the atmospheric setup strongly disfavors any temperature spike above the current 12°C threshold [4].

Traders should monitor the MetService and AccuWeather updates for any sudden wind shifts or cloud clearance that could alter the thermal profile before the 12:00Z settlement window [5][7]. A key dependency is the persistence of the northerly breeze; if it weakens significantly by midday, a marginal rise above 12°C could occur, though current forecasts suggest high winds will continue through Thursday [7]. No major weather announcements are scheduled, but real-time station data from Wunderground will be the definitive resolution source, so any deviation from the 12°C trend in the next hour would be the primary catalyst to watch [2].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on July 21? 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

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 Prediction Today. 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.

Do I need to KYC for this market?

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

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.