Highest temperature in Toronto on May 30?

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Market context

Toronto's maximum temperature on 30 May 2026 will be measured at Pearson International Airport, with settlement determined by Wunderground's historical weather records for that specific date. The 0% crowd probability suggests traders are either uncertain about the range boundaries or awaiting clarity on which temperature bands are available for trading.

Late May in Toronto typically sees daily highs between 20–24°C, though the range can extend from 16°C on cooler days to 28°C during early heat waves. Historical data from Environment and Climate Change Canada shows that temperatures exceeding 25°C occur in roughly 40% of years by late May, whilst days below 18°C remain common. The 30th falls near the tail end of spring, when warm southerly flows from the American Midwest occasionally push readings into the upper 20s, but cold fronts can still deliver below-average conditions.

Traders should monitor Environment Canada's extended forecast as May 2026 approaches, particularly any signals of high-pressure systems or frontal activity scheduled for late May. The North Atlantic Oscillation and jet stream positioning in early May will provide early signals about whether subtropical air masses might reach southern Ontario by month's end. Pearson's location in Mississauga, near Lake Ontario, can moderate extremes compared to inland stations, making lakeside wind patterns a secondary consideration for understanding whether readings trend toward cooler or warmer boundaries within the typical range.

Methodology

This page reviews Highest temperature in Toronto on May 30? 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 Prediction Today — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

FAQ

Where can I trade this market with the lowest fees?

On Prediction Today, 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.

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 Prediction Today?

Zero. Prediction Today 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.

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.