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 high will fall. The settlement hinges on Wunderground's historical data feed for that specific station, with resolution occurring at 12:00 UTC on 30 May. Traders holding conditional tokens (YES or NO) on any given temperature bracket will see their USDC collateral distributed according to whichever range captures the actual recorded high.

Late May in Toronto typically sees highs between 20–24°C, though the range widens considerably depending on air mass positioning. Historical data from the past decade shows occasional outliers: May 2022 reached 28°C, whilst cooler years have stalled at 16–18°C. The current 0% pricing across all brackets suggests the market has not yet attracted sufficient trading volume to establish meaningful odds, a common state for weather contracts more than a year out. Early-season traders often wait until late April or early May before committing capital, when ensemble forecasts narrow considerably.

The relevant catalyst is the North Atlantic Oscillation and jet stream configuration in late May 2026, which will determine whether warm southwesterly flow or cooler maritime air dominates. Environment Canada's seasonal outlooks, published in April 2026, will provide the first institutional signal on whether anomalous warmth or coolness is expected. Traders should monitor those releases and any El Niño or La Niña persistence into late spring, as these patterns influence North American temperature regimes on monthly timescales.

Methodology

We track Highest temperature in Toronto on May 30? on the five venues with material liquidity for prediction markets. Live odds come from the Polymarket Polygon order book — the only source that ships real-time data under an open licence. For Kalshi, Betfair and Manifold we list platform attributes (fee, KYC, settlement, payment) instead of fabricated odds, because their APIs use non-comparable contract definitions.

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 Legit? 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'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 Polymarket Legit??

Zero. Polymarket Legit? 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, Polymarket Legit? triggers a quick verification flow that finishes in minutes.