Pronóstico: Highest temperature in Toronto on August 12?

Platform comparison

Market context

On 12 August 2026, Toronto's highest temperature will be measured at Pearson International Airport's weather station and recorded in Weather Underground's Daily Observations table. The market currently prices this contract at 0% YES across all temperature bands, reflecting either extreme confidence in a specific range or minimal trading activity. Settlement hinges on the precise observation logged in Wunderground's primary data source rather than the Day High & Low summary, a distinction that matters when automated systems or manual corrections diverge between the two feeds.

Toronto's August climate is relatively stable year-on-year, with historical highs typically clustering between 25–28°C. The city experienced a peak of 31.9°C on 12 August 2012 and 29.4°C on 12 August 2015, suggesting the date itself carries no systematic anomaly. Traders should note that summer heat waves in southern Ontario often correlate with high-pressure systems tracking from the American Midwest; the absence of such patterns in early August forecasts would support temperatures in the historical median range rather than extremes.

Environment and Climate Change Canada publishes extended forecasts roughly ten days ahead, with meaningful revisions typically arriving three to five days before the settlement date. Any significant weather system—Atlantic tropical activity, Arctic outflow, or persistent ridging—would become visible in operational models by early August. The USDC-denominated conditional tokens on Polygon will reflect these updates as traders adjust positions, though the 0% current probability suggests the market may lack sufficient liquidity or interest to establish meaningful price discovery at this stage.

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 Polymarket Qué Es. 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.

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.

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.