Highest temperature in Toronto on July 16?

Platform comparison

Market context

Toronto’s highest temperature on 16 July 2026 at Pearson International Airport is the real-world event this contract settles on, with the market currently pricing a YES outcome at 0% for any temperature above the lowest range. On Polymarket, traders use USDC on the Polygon network to buy conditional tokens representing each temperature bracket, locking in exposure until the settlement window closes at 12:00 UTC on 16 July 2026. The zero probability suggests the crowd expects a cool day, but historical mid-July peaks in Toronto often exceed 25°C, creating a potential mispricing if the forecast shifts.

Mid-July heatwaves in Toronto have frequently pushed Pearson’s daily maximum above 28°C, with 2024 and 2023 both recording highs of 31°C and 30°C respectively on 12–14 July [1]. The current 0% YES probability for higher ranges ignores this pattern, as even a modest warm spell would invalidate the implied certainty of a cool day. Traders should compare today’s pricing against these recent comparable cases to assess whether the market is underreacting to seasonal norms.

Key catalysts include Environment Canada’s hourly forecast updates and the 6 AM EDT surface analysis, which will determine if a high-pressure ridge builds over southern Ontario. A recent alert from The Weather Network notes that a weak frontal system approaching from the west could either suppress temperatures or, if it stalls, allow heat to accumulate by afternoon [1]. Watch the 12-hour forecast window on Wunderground for the Pearson station, as the resolution source relies solely on its recorded maximum, and any sudden shift in wind direction or cloud cover could alter the outcome before the 12:00 UTC cutoff.

Sources: 1

Methodology

We track Highest temperature in Toronto on July 16? 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

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.

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.

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.