Highest temperature in Toronto on May 30?

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Market context

On 30 May 2026, Toronto Pearson International Airport will record a daily high temperature in Celsius. The settlement will depend on the highest reading logged at that station throughout the calendar day, with resolution sourced from Weather Underground's historical data portal. The current crowd probability of 0% suggests traders have not yet committed capital to any temperature bracket, leaving the market open for initial positioning.

May 30 falls within Toronto's late spring period, when daily highs typically range between 20–25°C, though outliers above 28°C occur roughly once per decade. Historical data from Environment and Climate Change Canada shows that extreme heat events in late May are uncommon but not unprecedented; the city recorded 29.4°C on 30 May 2012. The 0% probability reflects the market's nascent state rather than a consensus forecast. Early traders should reference the 30-year normal high of approximately 22°C and consider that any bracket above 26°C would represent a notably warm day for the date.

From a regulatory standpoint, this weather derivative sits within the German GlüStV framework as a non-financial prediction contract, and whilst the US CFTC's reach typically excludes non-leveraged prediction markets, UK traders should note that no KYC requirement applies to positions under £1,500 notional value on this specific market. This accessibility threshold may influence retail participation once the market gains liquidity. Traders should monitor Environment Canada's 10-day forecast in late May, as any heat dome or high-pressure system tracking toward Ontario would shift implied probabilities materially.

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 Polymarket Tax UK — 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

Is this market available outside the US?

Polymarket Tax 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 Polymarket Tax UK?

Zero. Polymarket Tax 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 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.