Highest temperature in Toronto on July 16?

Platform comparison

Market context

On 16 July 2026, the real-world event determining this market’s outcome is the highest temperature recorded at Toronto Pearson International Airport, measured in degrees Celsius. In prediction markets, a YES share pays out if the temperature falls within the specific range the trader selected, while a NO share wins if it falls outside that range. The current crowd-implied probability of 0% for YES suggests traders believe the selected range is virtually impossible, likely because it targets an extreme outlier compared to typical mid-July highs.

Historical data frames this near-zero probability as rational. Last year, on 16 July 2025, Toronto faced an extreme heat warning with temperatures soaring high enough to trigger public health advisories for symptoms like nausea and fatigue[1]. However, even during that record-breaking heatwave, temperatures did not reach the extreme thresholds implied by the current YES range, which appears to target values far beyond the city’s documented peaks. Environment Canada has previously noted that while extreme heat breaks records, such events remain rare and usually stay within a predictable upper bound for the region[2].

Traders should monitor daily Environment Canada forecasts and local air quality alerts as the settlement window approaches, as these often signal impending heat spikes. While no specific announcement for 2026 exists yet, the dependency on real-time weather data means the market will react instantly to any official heat warnings issued for the Greater Toronto Area. The resolution relies strictly on Wunderground’s recorded maximum for Toronto Pearson, so any discrepancy between local reports and the station’s official reading could alter the outcome, making the official data source the primary catalyst to watch.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in Toronto on July 16? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Prediction Market UK, which mirrors the Polymarket order book at 0% fees.

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 Market UK. 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 Prediction Market UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.