Highest temperature in Toronto on August 12?

Platform comparison

Market context

The market concerns the highest temperature recorded at Toronto Pearson International Airport on 12 August 2026, measured in degrees Celsius and sourced from Weather Underground's Daily Observations table. Settlement occurs at 12:00 UTC on that date, with resolution tied to the specific station data rather than summary forecasts. The 0% implied probability across the prediction market suggests traders are currently assigning negligible likelihood to any particular temperature range, though the market structure itself—with discrete temperature bands—typically generates non-zero probabilities across multiple outcomes as the event date approaches.

Toronto's August climate shows consistent patterns: daily highs typically range between 24–27°C, with extremes occasionally reaching 30°C or above during heat waves. Historical data from Environment Canada indicates that temperatures exceeding 32°C occur roughly once every five to seven years in August, whilst readings below 20°C are uncommon but possible during cooler weather systems. The current flat probability distribution reflects the inherent uncertainty of weather forecasting at a two-year horizon; comparable markets on specific daily temperatures typically see meaningful probability shifts only within 7–10 days of the target date.

Traders should monitor seasonal climate forecasts released by Environment and Climate Change Canada in summer 2026, which may indicate whether August leans warmer or cooler than the 30-year average. Upper-air pattern developments—particularly jet stream positioning and any tropical systems affecting eastern North America—will drive near-term adjustments. Weather Underground's data consistency and station maintenance records should be verified closer to the settlement date, as any instrumentation changes could affect resolution interpretation.

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 Best Prediction Markets UK, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Best Prediction Markets 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.

What are the best prediction markets for UK traders in 2026?

For UKGC-regulated markets: Betfair Exchange (sports, politics) and Smarkets (sports, politics, lower commission than Betfair). For broader global event prediction: Polymarket (deepest liquidity, 0% fee, USDC settlement). For US-regulated option: Kalshi (USD, limited UK payment options). Most serious UK traders use a combination of Betfair for regulated sports and Polymarket for broader markets.