Highest temperature in Sao Paulo on July 9?

Platform comparison

Market context

The real-world event driving this market is the daily high temperature recorded at São Paulo-Guarulhos International Airport on 9 July 2026, with the crowd currently assigning zero probability to a reading of exactly 23°C. Historical data frames this near-impossibility clearly: July is São Paulo’s coolest month, with average highs around 22°C and typical daily peaks rarely exceeding 23°C, while recent forecasts for July 2026 show highs ranging from 18°C to 27°C[1][7]. Even during extreme heatwaves elsewhere in Brazil, such as the record perceived temperature of 62.3°C in Rio de Janeiro in 2024, actual ambient temperatures in São Paulo remained far lower, typically hovering near 35°C at their peak[3][4]. This consistent thermal pattern suggests that a precise 23°C hit is statistically negligible given the city’s winter climate profile.

Traders should monitor upcoming weather bulletins from AccuWeather and Climate Data for any anomalous warming trends scheduled for early July 2026, though no major political catalysts or campaign-finance disclosures are expected to influence local weather conditions directly[1][10]. The market leans heavily on the natural seasonal dependency that July temperatures in São Paulo remain stable and cool, with no scheduled debates, conventions, or declarations capable of altering atmospheric conditions. Recent news from DW confirms that while Brazil experiences severe heatwaves, São Paulo’s temperatures remain moderate compared to coastal cities like Rio, reinforcing the 0% probability stance[4]. Without an unprecedented meteorological shift, the 23°C threshold remains an outlier unlikely to materialise.

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 Sao Paulo 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

What resolution source is used for elections?

Polymarket defines the source per contract — usually Associated Press (AP Race Call), Reuters or the official electoral commission. The source is stated in contract details before the market opens.

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.

How fast do political markets react to news?

High-liquidity markets move within seconds to minutes. A Trump tweet on the economy can shift the "Trump 2024" market 2-5 points before mainstream media has written anything.

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.