Highest temperature in Toronto on July 9?

Platform comparison

Market context

Toronto Pearson International Airport hit a scorching 36°C today, marking the hottest temperature recorded in the city since July 2016, yet the prediction market for tomorrow’s peak assigns a 0% probability to any outcome exceeding 36°C. This stark divergence stems from the immediate weather shift: heavy rain and 15mm of precipitation are forecast for the afternoon and evening of July 9, 2026, which will likely suppress the daily high to around 24°C. The crowd-implied probability of 0% for a "36°C or higher" outcome is therefore a rational response to the incoming storm system, not a dismissal of the recent heatwave.

Historical data frames this current probability as a sharp correction rather than an anomaly. While July 2026 forecasts show daily highs ranging from 73°F to 93°F (23°C to 34°C) with an average of 80°F (27°C), the specific conditions for July 9 deviate significantly from the seasonal norm due to the heavy rain event. Comparable cases from the past decade show that when a major rain system interrupts a heatwave, daily highs often drop by 10°C or more, aligning with the market’s low expectations for extreme temperatures tomorrow.

Traders should monitor the real-time precipitation accumulation and wind gusts, which are currently reported at 34 km/h, as these are the primary catalysts determining the final temperature. The National Weather Service confirms that the heavy rain will persist through the evening, making a return to the 36°C peak highly improbable. Recent updates from AccuWeather reinforce that the overnight lows will fall to 54°F (12°C), further ensuring that the daily maximum will remain well below the 36°C threshold. The market’s 0% probability is a direct reflection of these confirmed meteorological dependencies.

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

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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'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.