Highest temperature in Toronto on May 30?

Platform comparison

Active sub-markets

Market context

On 30 May 2026, Toronto Pearson International Airport will record a daily high temperature, and Polymarket currently prices all outcome ranges at 0% YES, indicating no meaningful liquidity or consensus on where that reading will land. The settlement hinges on Wunderground's historical data for that specific date, denominated in Celsius, with the exact range brackets determining which conditional token resolves in the money. Traders settling positions will need USDC on Polygon to execute, and the contract closes at 12:00 UTC on the resolution date itself—a tight window that leaves little room for post-event arbitrage.

Late May in Toronto typically sees highs between 20–24°C, though the city experiences considerable year-to-year variance. The 30-year average for that date sits near 22°C, but outlier years have produced readings as low as 16°C and as high as 29°C. The 2023 and 2024 spring seasons showed warmer-than-normal trends across Ontario, which could inform priors, though single-day forecasts remain inherently uncertain even weeks in advance.

The relevant catalyst is the seasonal weather pattern emerging in late May 2026. High-pressure systems tracking from the west or tropical moisture from the south would push temperatures toward the upper ranges, whilst cloud cover and northerly flow would suppress them. Environment Canada's extended forecasts, typically reliable only 10–14 days out, will become the primary information source as the date approaches. Traders should monitor spring 2026 climate indices and any anomalous jet-stream positioning reported in early May.

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket UK, which mirrors the Polymarket order book directly.

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 Polymarket 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?

Polymarket 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.

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.