Highest temperature in Toronto on August 7?

Platform comparison

Market context

Toronto Pearson’s 7 August peak will settle into the **26°C** or **27°C** band if the day behaves like a typical late-summer Toronto session, and the current crowd-implied **0% YES** for a higher outcome makes the favourite/underdog split very clear. On the board, **26°C** is the consensus favourite at about **77%**, with **27°C** the main alternative at roughly **17%**, so the market is effectively pricing a fairly ordinary warm day rather than a breakout heat event.[1][2]

The historical read supports that framing: Toronto’s August norms sit in the mid-20s, with average daytime highs around **25°C**, while Weather Underground-style airport readings can run a touch cooler or warmer depending on cloud cover, wind off Lake Ontario, and whether the midday maximum is reached before any late-afternoon moderation.[10][11] That means the value spot is usually in the neighbouring band, not in chasing an extreme; contrarian upside tends to live in **27°C** if skies stay clear and the boundary layer mixes well, while the favourite holds if cloud or a light onshore flow caps the maximum near **26°C**.[1][2][10]

For traders, the key catalysts are the day-of forecast updates and any morning-to-noon shift in cloud, rain, or wind timing, because this market resolves on the **Daily Observations** temperature at Toronto Pearson rather than a summary high/low card. Toronto’s late-July pattern has already shown how quickly a warm setup can be knocked down by storms or softened by changing wind direction, so the useful watchpoint is whether the airport sits in a sunny, well-mixed air mass through the settlement window.[15][17]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Highest temperature in Toronto on August 7? 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 Who Will Win, 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.

UK Frequently Asked Questions

Is this market available outside the US?

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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.

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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?

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