Highest temperature in Wellington on July 23?

Platform comparison

Market context

Wellington has moved into a windy, mild winter pattern, with the latest forecast pointing to a daytime high around 14°C and strong north to north-westerly winds through Thursday. AccuWeather’s current outlook shows a high of 58°F, which is about 14°C, alongside gusts up to 36 mph and cloud cover rather than any sign of a hot spell[3][5].

That matters because the market only resolves to the **highest temperature** reached at Wellington International Airport on 23 July, not the daily average or the overnight low. The local July climate is usually cool, with one climate summary putting Wellington’s average July high at 13.7°C, so a reading in the mid-teens is already close to normal and well above the colder bins that often attract more weight in winter markets[2]. Against that backdrop, a 0% crowd-implied chance of a higher temperature band implies traders are treating an exceptional warm-up as very unlikely.

For today’s outlook, the key catalyst is whether the wind-driven warming forecast actually translates into a brief spike near the airport rather than just a few mild hours elsewhere in the city. The main things to watch are the hourly forecast updates, any change in wind strength or cloud cover, and the final Wunderground reading for Wellington Intl Airport, since this market settles on that station’s recorded daily maximum[3][5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Wellington on July 23? 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.

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 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.