Highest temperature in Toronto on July 9?

Platform comparison

Market context

The underlying event is simply whether Toronto Pearson International Airport will record a daily high temperature within a specific Celsius range on 9 July 2026, a date currently priced at zero probability for the YES outcome. Historical data frames this near-certain rejection: July in Toronto typically sees average highs around 26.4°C (79.5°F), rarely dipping below 21°C or exceeding 32°C, with the warmest average day occurring on 20 July at 26.7°C [3][10]. The current 0% implied probability aligns with these norms, as the market likely anticipates the temperature will fall outside the narrow bracket being traded, mirroring the bearish momentum seen in the similar 7 July market where prices dropped sharply from 50% to 34% before resolution [1].

Traders should monitor the National Weather Service heat advisories and upcoming humidity forecasts, as the region is currently under a heat advisory extending through 10 July with temperatures in the low 90s Fahrenheit and expected thunderstorms [7]. The market is leaning on the catalyst of rising humidity and potential storm activity, which NOAA indicates will push temperatures 10 degrees above normal into the upper 90s next week, potentially altering the daily high on 9 July [7]. While the Robinhood market for Los Angeles on the same date suggests broad summer heat trends, the specific dependency for Toronto remains the local weather service data from Wunderground, which will confirm the highest temperature recorded at any time on that day [5].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

Political prediction markets differ structurally from sports betting: thinner liquidity, longer settlement windows, higher sensitivity to single news events. This page shows the live Polymarket quote for Highest temperature in Toronto on July 9? plus platform attributes for the three reference venues, so you can see at a glance where the deepest market for this question sits.

Resolution & payout

For political markets the resolution source is decisive. Polymarket defines a concrete source per contract (e.g. AP, Reuters, official electoral commission) and uses the UMA Optimistic Oracle as the on-chain dispute mechanism. With a clearly defined outcome the USDC payout lands within minutes of the final confirmation.

FAQ

How accurate are political prediction markets?

Historically more accurate than polls. Polymarket's Brier score on US 2024 elections was ~0.11 — better than 538 (~0.14) and every mainstream poll. Markets aggregate information with real skin in the game.

Can prediction markets influence election outcomes?

Markets reflect expectations rather than create them. Studies show public-facing markets can anchor expectations, but don't influence the underlying outcome. Political markets are information, not advocacy.

Which platform has the deepest political liquidity?

Polymarket — by far. US 2024 presidential volume was ~$3.5B vs Kalshi (~$200M) and Betfair (~$120M). Where Polymarket is geo-blocked, brokers like Trump Prediction route into the same order book at 0% fees.

Why do Polymarket and Kalshi differ on elections?

Kalshi must follow CFTC compliance — strict definitions, clear resolution sources, US citizens only with KYC. Polymarket operates globally without CFTC oversight — deeper liquidity, but also higher regulatory risk.

Which political events have the biggest volume?

US Presidential election, party nominations (DNC/RNC), Senate majorities, individual state outcomes (Pennsylvania, Michigan, Wisconsin), and major European elections. Peak markets reach $50-500M per event.