Highest temperature in Toronto on August 12?

Platform comparison

Market context

On 12 August 2026, Toronto Pearson International Airport will record a daily high temperature in Celsius, with traders on Polymarket currently pricing all outcome ranges at 0% probability—a technical artefact reflecting the market's nascent state rather than genuine uncertainty about whether the day will occur. The settlement hinges on Weather Underground's Daily Observations table for the station, not the summary high-low display, a distinction that matters when automated systems occasionally diverge or when intraday spikes exceed the official daily maximum.

Toronto's August climate provides a stable baseline: the airport's historical August average high sits near 26°C, with extremes ranging from 13°C on cold years to 34°C during heat waves. The 2022 heat dome pushed temperatures above 30°C for extended stretches, whilst cooler Augusts in recent memory (2015, 2020) saw highs cluster in the 22–25°C band. These precedents suggest the market's outcome ranges likely span from sub-20°C through to 32°C or higher, with mid-range outcomes (24–28°C) statistically most probable based on climatological norms.

Traders monitoring this contract should track Environment Canada's seasonal forecasts released in July 2026, which typically indicate whether Atlantic ridge positioning or Arctic outflow patterns favour above or below-normal temperatures. The North Atlantic Oscillation index and any tropical storm activity in early August could shift conditions materially. Settlement occurs at 12:00 UTC on the resolution date, giving traders roughly twelve hours after the Toronto morning to confirm the final reading before conditional tokens resolve on Polygon.

Methodology

This page reviews Highest temperature in Toronto on August 12? 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 PolyGram, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

UK Frequently Asked Questions

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 PolyGram. 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.