Highest temperature in Toronto on May 30?

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Market context

On 30 May 2026, Toronto's highest temperature will be recorded at Pearson International Airport, with settlement determined by Wunderground's historical weather data for that specific date. The market currently shows 0% probability across all temperature ranges, suggesting either insufficient trader participation or genuine uncertainty about which bracket will resolve.

Toronto's May weather exhibits considerable variability. Historical data from Environment and Climate Change Canada shows late-May highs typically range between 18°C and 24°C, though outliers occur regularly. The 30-year average high for 30 May sits near 21°C, with recorded extremes spanning from 11°C to 29°C depending on prevailing air masses. Comparable late-spring days at Pearson show that warm southwesterly flows can push temperatures into the mid-to-upper 20s, whilst cool maritime influences or cloud cover can suppress readings into the low teens. Understanding this historical spread is essential for calibrating probability across the available temperature bands.

Traders should monitor long-range weather forecasts beginning in mid-May, though such predictions carry substantial uncertainty at the ten-day horizon. The North Atlantic Oscillation and broader jet-stream positioning in late May will influence whether warm continental air or cooler Atlantic systems dominate the region. Real-time forecast updates from Environment Canada and the US National Weather Service typically become reliable only five to seven days before the settlement date. Pearson's location in the Greater Toronto Area's urban heat island means the airport station may record slightly higher temperatures than surrounding rural areas during clear, sunny conditions.

Methodology

This page tracks Highest temperature in Toronto on May 30? 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

Where can I trade this market with the lowest fees?

On Trump Prediction, 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?

Trump Prediction 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 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.

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.