Highest temperature in Toronto on May 30?

Platform comparison

Active sub-markets

Market context

Toronto's highest temperature on 30 May 2026 will be recorded at Pearson International Airport, the city's primary weather observation point. The settlement hinges on Wunderground's historical data feed for that specific date, with resolution occurring at noon UTC. Traders need to verify the data source's refresh schedule and any potential gaps in station reporting, as airport weather stations occasionally experience brief outages that could affect final readings.

May 30th sits near the threshold of Toronto's late spring warming pattern. Historical records show typical highs between 22–25°C for this date, though the city has recorded extremes ranging from 16°C to 29°C across different years. The 0% crowd probability suggests either technical market seeding or genuine uncertainty about which temperature band will resolve. Comparable spring weather markets typically see clustering around the 20–25°C range; traders should cross-reference Environment Canada's 30-year normals and recent May performance to calibrate expectations against the available resolution brackets.

Programmatic traders should monitor Environment Canada's extended forecast updates, which typically stabilise three to five days before the target date. Atmospheric patterns in late May are influenced by jet stream positioning and any residual Arctic air masses—factors that shift materially week-to-week. Setting conditional orders keyed to Environment Canada's official forecast revision timestamps would capture value shifts more efficiently than manual monitoring. The settlement window closes at noon UTC, creating a hard deadline for any last-minute data corrections from Wunderground's historical archive.

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

Where can I trade this market with the lowest fees?

On Polymarket Bot 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 Bot 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.

What does it cost to trade on Polymarket Bot UK?

Zero. Polymarket Bot UK 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 Bot UK triggers a quick verification flow that finishes in 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.