Highest temperature in Toronto on August 2?

Platform comparison

Market context

Toronto Pearson’s highest reading on 2 August will be the key figure, not the daily mean, so intraday spikes around early afternoon matter more than the morning outlook. With the market settling from Wunderground’s station record, the practical setup is to watch the airport’s observed maximum in Celsius and map it into the listed range before the end of the settlement window. Toronto’s August climatology is summer-warm rather than extreme: average highs sit around 25–27°C, with occasional days reaching the upper 20s or low 30s when the air mass is favourable.[1][3][18]

That makes the current 0% yes pricing look detached from seasonal norms rather than a signal that a hot outcome is impossible. Historical August distributions for Toronto cluster around the mid-to-high 20s, with WeatherSpark noting daily highs commonly near 77°F and rarely above 85°F, while long-range August forecasts from multiple providers place early-August highs around 25–27°C.[17][18][19] For a programmatic trader, the cleanest approach is to treat the market as a one-day max-temperature bucket: ingest the airport observation feed, compare the highest reported Celsius value to the contract bands, and ignore downtown weather proxies unless they materially change expectations for Pearson.

The main catalysts are any short-term forecast shifts tied to convection, frontal passage, or smoke and wind direction, because those can cap or lift the afternoon peak. A local forecast published on 31 July pointed to a warm, humid Toronto stretch with temperatures climbing to 30°C and the possibility of isolated thunderstorms, which is the sort of setup that can either suppress the maximum through cloud cover or leave a brief heating window if storms stay scattered.[14] For tooling, the relevant dependency chain is simple: monitor Pearson’s observed hourly updates, track mesoscale forecast changes from the evening before, and set conditional orders around the mid-20s and high-20s ranges rather than around a single point estimate.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Toronto on August 2? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Review UK, which mirrors 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

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

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.

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.