Highest temperature in Toronto on June 25?

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Market context

The real-world event centres on the highest temperature recorded at Toronto Pearson International Airport on 25 June 2026, a date that recently saw a break in a three-day streak of extreme heat where temperatures exceeded 34°C before dropping to 30.0°C[2]. Historical data for June at this location shows daily highs typically ranging between 68°F and 83°F, with an average high of 77°F, while extreme records include a scorching 35.8°C set on a Monday afternoon in a recent year, surpassing the 1921 record of 32.8°C[3][7]. The current crowd-implied probability of 0% for any specific outcome suggests the market views the event as either settled or highly uncertain, diverging sharply from the 100% certainty assigned to 24°C in a similar Polymarket contract for 23 June, which indicates a potential mispricing or a shift in weather patterns between the two dates[1].

Traders should monitor Environment Canada heat warnings and daily temperature advisories, as these official schedules dictate public exposure limits and often correlate with peak temperature spikes[3]. Recent news confirms that heat warnings for the Greater Toronto Area can persist until Tuesday evening, with agencies recommending outdoor activities be scheduled during cooler parts of the day[3]. The settlement window ending 2026-06-25T12:00:00Z means the market resolves based on the highest temperature recorded for all times on that day, sourced from Wunderground, making the timing of the peak heat critical for accurate odds assessment[1]. Divergence between sportsbook lines and prediction-market implied probabilities may emerge if analysts revise consensus on the likelihood of a heatwave rebound following the recent temperature drop to 30.0°C[2].

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 Best Prediction Markets UK, 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?

Best Prediction Markets UK 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.

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 it cost to trade on Best Prediction Markets UK?

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

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.