Highest temperature in Toronto on June 25?

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Market context

The underlying event is the forecast for extreme heat at Toronto Pearson International Airport on 25 June 2026, where the crowd-implied probability of a specific high-temperature range sits at zero per cent. This near-total dismissal suggests traders believe the day will not reach the threshold required for the "YES" outcome, likely due to a predicted cooling trend or cloud cover breaking the recent heat streak.

Historical data frames this probability sharply, as Toronto has recently experienced three consecutive June days with maximum temperatures exceeding 34°C before dropping to 30.0°C on 25 June in a prior year[7]. While Environment Canada recorded a scorching 35.8°C at Pearson on a recent Monday, breaking the 1921 record of 32.8°C, such extremes are often followed by rapid declines rather than sustained peaks[2]. The average daily high for June typically ranges between 68°F and 83°F, meaning a sudden spike to the highest possible bracket is statistically less probable than a return to moderate warmth[6].

Traders should monitor Environment Canada’s heat warning schedules and any scheduled climate declarations that might influence public cooling centre usage, as these often correlate with temperature mitigation efforts[2]. The market leans heavily on the catalyst of a breaking heat streak, similar to the recent drop from 34°C+ days to 30.0°C, which signals a potential shift in atmospheric conditions[7]. No major political debates or campaign-finance disclosures are expected to directly alter local weather patterns, so the primary focus remains on meteorological bulletins and real-time temperature updates from Wunderground.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page tracks Highest temperature in Toronto on June 25? across four political prediction venues. Live odds come from the Polymarket order book (the deepest political prediction-market book). Kalshi is the CFTC-regulated US alternative, Betfair the established UK sports-exchange with politics markets, Manifold the open play-money variant. Trump Prediction routes every trade through to Polymarket — at 0% fees.

Resolution & payout

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

FAQ

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 Trump Prediction?

Zero. Trump 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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, Trump Prediction 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.