Highest temperature in Toronto on August 2?

Platform comparison

Market context

Toronto’s **highest temperature at Pearson on 2 August** will be set by the warmest reading logged at Toronto Pearson Intl Airport Station before the settlement window closes at noon UTC. With the crowd pricing **0% YES**, the market is treating the named range as effectively outside the current consensus, so any upside case needs either a materially hotter airport forecast than expected or an intra-day spike that pushes the day’s maximum into the relevant bucket.

That zero-implied price looks stretched against the broader August climatology. Toronto’s August highs are typically in the mid-20s Celsius, with average highs around 25–27°C in the main forecast sources and occasional days reaching the upper 20s or low 30s when warm air dominates.[1][3][5][17][18] Comparable long-range and monthly outlooks also lean warm rather than cold, which would normally keep the day’s peak near the middle of the distribution rather than in an extreme low range.[8][14][18] On that basis, the market appears to be trading well below a simple seasonal baseline, although airport-specific readings can differ from downtown forecasts and settlement depends on the Pearson station, not the city average.[12]

The main catalysts are the day’s actual hourly evolution, especially cloud cover, rain showers, and whether a front arrives early enough to cap the afternoon maximum. Short-range forecasts currently point to warm conditions around 26–28°C for early August, but some services also flag showers and variable winds, which could shave a degree or two off the peak if they arrive during the warmest part of the day.[2][4][6][7][19] For cross-platform comparison, sportsbook-style weather lines, prediction-market pricing, and analyst-style forecast sites are all likely to converge quickly once the morning observations and midday updates are in, with Pearson’s airport-specific temperature path the key dependency for any late repricing.[12][19]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Toronto on August 2? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

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 itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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 Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like PolyGram trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.