Highest temperature in Toronto on July 9?

Platform comparison

Market context

On 9 July 2026, Toronto Pearson International Airport recorded a peak temperature of 24°C under heavy rain, a stark contrast to the crowd-implied 0% probability for any outcome above 29°C. Historical data frames this as an underdog scenario: while July averages hover near 26°C (79°F), extreme heat events like the 35.8°C record set in 2026 are rare outliers. The consensus firmly backs the 29°C range at 100%, treating cooler, wetter days as the norm, yet the recent 36°C spike suggests value may lie in contrarian bets on higher ranges if humidity patterns shift unexpectedly.

Traders should monitor the National Weather Service’s hourly updates for CYYZ and Environment Canada’s heat warnings, particularly given the heavy rain forecast for the afternoon and evening of 9 July. A recent report from Climate Impact Company notes that the week ending 9 July is projected to be the hottest in the US over the past decade, with heat indices approaching 110°F, hinting that regional humidity could elevate Toronto’s temperatures beyond the current 24°C reading. The key dependency is whether the rain clears to allow solar heating, as persistent cloud cover will likely keep temperatures near the 24°C floor, reinforcing the 29°C frontrunner status.

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

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.

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.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Who Will Win 2026 trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.