Pronóstico: Highest temperature in Toronto on June 25?

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Market context

The underlying real-world event is the highest temperature recorded at Toronto Pearson International Airport on 25 June 2026, measured in degrees Celsius. Polymarket prices this contract today with the "20°C" range at 100% probability, while the "YES" outcome for any higher range sits at 0%, reflecting a market consensus that extreme heat is unlikely for this specific date [1]. This pricing ignores the abstract possibility of a heatwave and instead locks in the current on-chain expectation driven by conditional tokens settled in USDC on the Polygon network.

Historical data frames this low probability against comparable cases where June 25 has seen moderate warmth rather than extremes. While a record low of 22.9°C was noted on this date in 2024, indicating a warm night, daily highs in June at Pearson typically range from 71°F to 78°F (21°C to 26°C), rarely exceeding 88°F (31°C) [6][9]. The current 0% probability for higher ranges aligns with the average trend where daily highs rarely breach the 30°C threshold, suggesting the market correctly interprets the historical ceiling for this date.

Traders should monitor Environment Canada heat advisories and scheduled outdoor activity restrictions, as these serve as primary catalysts for temperature spikes. A recent extreme heat event at Pearson Airport saw temperatures reach 33.7°C, prompting warnings to limit exposure and hydrate frequently, which illustrates the volatility traders must watch [2]. The dependency on Wunderground data for resolution means any sudden shift in the national forecast, such as the one issued by The Weather Network for 25 June 2026, could alter the conditional token distribution before the settlement window closes [7].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Toronto on June 25? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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 PolyGram, 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.

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in 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.