Highest temperature in Toronto on July 9?

Platform comparison

Market context

The real-world event centres on the peak temperature recorded at Toronto Pearson International Airport on 9 July 2026, with the market currently pricing a 29°C outcome at 100% probability, while the crowd-implied chance for any other range sits at 0% [1]. Historical data for this location in July shows daily highs averaging around 79°F (26°C), rarely dipping below 70°F or exceeding 89°F (32°C), with the highest average peak occurring on 20 July [3]. The forecast for July 2026 specifically indicates daily highs between 73°F and 93°F (23°C to 34°C), aligning closely with the 29°C frontrunner [2]. A notable recent outlier occurred when Toronto hit 36°C, the hottest in nearly a decade, but such extremes are statistically infrequent compared to the current consensus [6].

A programmatically minded trader should monitor real-time dependencies from Wunderground, the designated resolution source, which logs the highest temperature for all times on the day [1]. Key catalysts include the heavy rain and showers forecast for the afternoon and evening of 9 July, which could suppress peak temperatures below the 29°C threshold [5]. Traders must also watch for broader heat wave patterns; recent reports note a significant heat event across the US with heat indices approaching 110°F, which could influence regional weather if the system spreads east [7]. The National Weather Service recorded temperatures of 75°F at 10:00 am on 9 July, providing a baseline for early-day conditions that a bot would use to model the day’s maximum [8]. Any deviation from the 29°C consensus would likely stem from these precipitation events or unexpected shifts in the wider heat wave trajectory [9].

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

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 Polymarket Bot 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.

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