Highest temperature in Toronto on June 25?

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Market context

The real-world event is the daily high temperature recorded at Toronto Pearson International Airport on 25 June 2026, measured in degrees Celsius and resolved via Wunderground. Today, the airport is experiencing thundery showers with a current temperature of 23°C and a forecast high of 25°C, while rain probability sits at 70% with 5–10mm expected. This unsettled, cool start to the day contrasts sharply with the 0% crowd-implied probability for any temperature above the lowest range, suggesting traders may be underestimating the potential for a rapid heat spike later in the afternoon.

Historically, mid-June in Toronto has seen extreme heat breaks, including a record 35.8°C at Pearson in a recent heat warning event, and June 25 specifically holds the record for the highest low temperature (22.9°C) since 1938, indicating the day’s capacity for warmth even under cloudy skies [3][9]. The current 0% probability ignores these comparable extremes and the statistical tendency for June 25 to be unusually warm, framing the market as potentially mispriced if the afternoon clears and heats up.

Traders should monitor the 3pm–6pm local window for clearing skies and rising temperatures, as thundery showers often precede rapid warming if humidity drops. Key catalysts include Environment Canada’s heat advisories and any sudden shifts in wind direction from the west, which historically correlate with temperature spikes at Pearson [3]. No official line-up or injury news applies here, but the weather dependency is absolute: if the showers cease before 4pm, temperatures could breach 30°C, invalidating the current 0% stance.

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). The odds column is filled only where we have clean data — that avoids the made-up numbers that get a network demoted when search engines cross-check against the source venue.

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?

On Champions League Prediction, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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 it cost to trade on Champions League Prediction?

Zero. Champions League Prediction routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

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.