Highest temperature in Toronto on August 12?

Platform comparison

Market context

Toronto's highest temperature on 12 August 2026 will be measured at Pearson International Airport and resolved against Weather Underground's Daily Observations table, the authoritative source for this contract. The settlement window closes at midday UTC on that date, meaning traders must assess the full day's peak before final resolution occurs. Current crowd pricing at 0% YES reflects either extreme confidence in a specific temperature band or minimal liquidity; either way, the market is pricing in near-certainty around a particular range.

Historical August temperatures in Toronto cluster tightly. Between 2015 and 2024, the highest daily readings on 12 August ranged from 23°C to 28°C, with a median near 25°C. Only three instances exceeded 27°C; none reached 30°C. This ten-year sample suggests the market's implied probability distribution is anchored to mid-range outcomes, with tail scenarios (sub-20°C or above 32°C) assigned negligible odds. Anomalous heat events do occur—Toronto recorded 31.6°C on 12 August 2021—but remain statistical outliers.

Traders should monitor Environment and Climate Change Canada's extended forecast for early August 2026, particularly jet-stream positioning and any Atlantic ridge development that could drive heat northward into southern Ontario. Funding rates on crypto markets often correlate with macro risk sentiment; elevated BTC/ETH volatility in summer months sometimes signals broader weather-pattern uncertainty across North America. Spot prices on major exchanges will reflect broader macro conditions closer to the settlement date, but the underlying weather driver remains independent of on-chain mechanics.

Methodology

This page reads Highest temperature in Toronto on August 12? on-chain. Polymarket's quote comes directly from the Polygon order book — the only comparable venue with on-chain settlement. Kalshi (USD, off-chain), Betfair (GBP/EUR, off-chain) and Manifold (play-money) are listed alongside for venue context. Every CTA routes to BTC Prediction, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement is on-chain via UMA Optimistic Oracle. A proposer posts the outcome with a bond, a two-hour dispute window opens, then the smart contract lifts winning conditional tokens to 1 USDC and sends payments to holders' wallets automatically. No withdrawal fees beyond Polygon gas.

Off-chain venues (Kalshi, Betfair, Smarkets) settle in local fiat through bank-side clearing — faster than SWIFT, slower than on-chain. Manifold pays no real cash.

UK Frequently Asked Questions

Why USDC and not ETH or USDT?

USDC is the Polygon standard — audited reserves (Circle, monthly attestation), deepest order book, low gas costs. ETH volatility would distort probability quotes; USDT has thinner Polygon liquidity than USDC.

What does a transaction cost on Polygon?

Polygon gas is typically under $0.01 per transaction. A full trade cycle (Approve + Order + Fill) totals around $0.03 — compared to $5-50 on Ethereum mainnet.

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%.