Highest temperature in Toronto on July 15?

Platform comparison

Market context

Toronto Pearson International Airport is set to record its peak daily temperature for 15 July 2026, with the market currently pricing a specific outcome at 100% certainty despite real trading data showing significant dispersion. Historical mid-July heatwaves in the Greater Toronto Area typically push maximums between 30°C and 34°C, with 31°C emerging as the statistical favourite in active markets at 32% probability, while 32°C sits as the immediate underdog at 28% [1]. The consensus appears to have overcorrected toward a single range, creating a value spot for contrarians willing to bet on the 32°C or 33°C brackets where the implied probability is currently depressed relative to the climatological mean for this period.

Traders must monitor the incoming heat advisory schedules from Environment and Climate Change Canada, as the intensity of the current ridge system directly dictates whether temperatures breach the 31°C threshold. Recent reports indicate that while a heat wave is present, its operational impact on Pearson Airport has been minimal, with 96% of flights departing within a 24-hour window on time, suggesting stable atmospheric conditions that may not yet reflect the full thermal potential of the day [2]. The primary catalyst remains the official Wunderground daily record for the CYYZ station, which will settle the market; any deviation from the 31°C consensus hinges on whether the afternoon peak exceeds the current modelled average, making the 32°C outcome a logical hedge against a stronger-than-expected heat pulse.

Sources: 1 · 2

Methodology

We track Highest temperature in Toronto on July 15? 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

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Who Will Win 2026. 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.

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.