Highest temperature in Toronto on May 30?

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Market context

Toronto's weather on 30 May 2026 will be measured against historical May temperatures at Pearson International Airport, the official recording station for the city. Late May in Toronto typically sits in the range of 20–25°C, though the city experiences considerable year-to-year variation depending on whether warm air masses from the south dominate or cooler Atlantic patterns persist into early summer.

The 0% crowd probability suggests traders are pricing in an expectation that the high will fall outside the uppermost temperature bracket offered. Historical data from Wunderground shows that May 30 highs at Pearson have ranged from roughly 16°C to 28°C over recent decades, with temperatures above 26°C occurring in approximately one-third of years. The 2024 May 30 high reached 24°C; in 2023 it was 22°C. These records indicate that moderate-to-warm outcomes are neither rare nor exceptional for this date, yet the current market pricing reflects scepticism about extreme heat.

Traders should monitor Environment and Climate Change Canada's seasonal forecasts and any emerging ridge of high pressure in the week preceding 30 May. The Great Lakes' surface temperature—typically around 15–17°C in late May—acts as a moderating influence on Toronto's climate. Any significant deviation from normal atmospheric patterns in the days before the settlement window closes will be the primary driver of movement away from the current consensus.

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 Champions League Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

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'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 Champions League Prediction?

Zero. Champions League Prediction 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.