Highest temperature in Toronto on July 15?

Platform comparison

Market context

Toronto Pearson International Airport is set to record its peak temperature for 15 July 2026, with the market currently pricing a 100% probability that the event will resolve to a specific Celsius range. On Polymarket, this contract trades on the Polygon network using USDC, where conditional tokens reflect the crowd’s absolute certainty in a particular outcome despite the settlement window closing just hours away at 12:00:00Z. The frontrunner outcome is 31°C at 32% implied probability, closely followed by 32°C at 28%, suggesting the crowd is split on the exact degree despite the binary YES confidence in the market’s existence [1].

Historically, mid-July highs at Toronto Pearson often cluster between 30°C and 34°C, with recent days showing current readings near 34°C, which aligns with the upper end of the market’s leading ranges [2]. This thermal pattern frames the 100% YES probability as a reflection of the event’s inevitability rather than a specific temperature prediction, as the market resolves to the range containing the actual peak, not a single value. Traders should note that past July 15 readings frequently fall within the 31–33°C band, making the current 32% and 28% splits on 31°C and 32°C statistically plausible given seasonal norms.

The primary catalyst to monitor is the final Wunderground hourly update for CYYZ, which serves as the official resolution source and will lock in the highest recorded temperature for the day [1]. No external announcements or schedules influence this outcome, as the market depends solely on the automated data feed from the airport station. With settlement imminent, liquidity may shift rapidly as traders adjust positions based on the live temperature curve, but the underlying mechanic remains fixed: the contract resolves strictly to the range containing the day’s peak Celsius reading as published by Wunderground.

Sources: 1 · 2

Methodology

This page reviews Highest temperature in Toronto on July 15? 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 PolyGram, which mirrors the Polymarket order book at 0% fees.

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 PolyGram. 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.

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