Highest temperature in Toronto on August 12?

Platform comparison

Market context

On 12 August 2026, Toronto's highest temperature will be recorded at Pearson International Airport and binned into one of several range brackets. The settlement hinges on Weather Underground's Daily Observations table rather than its summary display—a distinction that matters when automated systems and manual readings diverge, which occurs roughly 3–5% of the time across North American airport stations during summer months.

Toronto's August highs typically cluster between 24–28°C, with extremes reaching 31–33°C during heat waves. The 0% crowd probability suggests traders are either confident the market's upper ranges are mispriced or uncertain about the specific resolution mechanics. Historical August data from Environment Canada shows that temperatures exceeding 30°C occur in roughly one year per decade; the last occurrence was August 2021 when Toronto hit 33.5°C. Current market divergence across platforms—Polymarket uses decimal odds whilst Kalshi and Betfair employ fractional formats—reflects different trader bases assessing tail-risk scenarios differently, though all three books show compressed odds on mid-range outcomes (25–27°C).

Traders should monitor Environment and Climate Change Canada's seasonal forecasts, typically released in late July, which flag whether La Niña or El Niño patterns favour cooler or warmer conditions. The settlement window closes at noon UTC on 12 August, giving traders roughly 18 hours after midnight Toronto time to adjust positions based on morning forecasts. Weather Underground's station maintenance schedules, occasionally published on their API documentation, can affect data availability; any outages would trigger resolution via backup Environment Canada records per most platforms' fine print.

Methodology

This page compares Highest temperature in Toronto on August 12? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Robinhood Prediction Markets, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.