Highest temperature in Toronto on May 24?

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Active sub-markets

Market context

Toronto's highest temperature on 24 May 2026 will be recorded at Pearson International Airport and resolved via Weather Underground historical data. This single-day maximum is a straightforward meteorological measurement with no discretionary interpretation; the settlement depends entirely on the station's thermometer reading at the moment of peak heat during that calendar date.

Historical May temperatures in Toronto show considerable variability. The city's average high for late May sits around 21–23°C, though records span from below 10°C on cool years to 29–30°C during warm spells. The 0% crowd probability suggests traders are either absent from this market or treating it as a placeholder pending seasonal forecasting updates. Comparable single-day temperature markets typically see meaningful probability shifts only once meteorological models converge, usually within 7–10 days of the event. Early May 2026 forecasts remain unavailable; historical precedent indicates that meaningful trading activity clusters in the final fortnight before settlement.

Regulatory accessibility differs by jurisdiction. Under German GlüStV rules, weather derivatives require full KYC verification regardless of stake size. US CFTC oversight applies to prediction markets accessible to American traders, though weather outcomes fall outside commodity futures regulation. UK-domiciled platforms typically allow anonymous trading up to £1,200 (approximately $1,500 USD equivalent) without identity verification, which lowers friction for small-stake weather bets. Traders should confirm their platform's specific KYC threshold and geographic restrictions before committing capital. Environment Canada and the Canadian Meteorological Centre publish extended forecasts in early May; monitoring those outputs will signal when professional meteorologists expect significant temperature anomalies.

Methodology

We track Highest temperature in Toronto on May 24? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

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.

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.

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.