Highest temperature in Sao Paulo on July 23?

Platform comparison

Market context

The reading for 23 July in São Paulo hinges on whether the city’s winter pattern stays closer to its mild July norm or gets pushed up by a brief warm spell. The market is currently leaning to a **23°C** peak, with **24°C** close behind, which fits the idea that late-July afternoons in São Paulo often top out in the low 20s Celsius rather than summer-like heat.[1][3]

That makes the historical frame straightforward: July is normally one of São Paulo’s cooler months, with an average daily high around **23°C** and comparatively humid, mild conditions.[3] Forecast pages for the city also point to a temperate setup rather than extreme heat, with rain and moderate wind more likely than a sharp temperature spike.[2][3] In that context, a zero-priced YES on a specific temperature outcome usually reflects the breadth of possible settlement bins rather than a strong view that a single number is impossible.[1]

For traders, the main catalyst is the day’s actual airport reading at São Paulo–Guarulhos, not broader city conditions, so the key watch items are the local afternoon high and whether cloud cover or rain limits warming before the settlement window closes.[1] With the market resolving off Wunderground’s station history for SBGR, any late-day surge in surface heating or a passing shower can shift the highest recorded value into a neighbouring band, which matters because the contract is about the *maximum* temperature for the day rather than the forecast high alone.[1][2]

Sources: 1 · 2 · 3 · 4

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 23? 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

Political markets typically settle on official candidate or agency confirmation. Polymarket uses UMA Optimistic Oracle: a proposer posts the outcome with a bond, the two-hour window opens, then the smart contract pays USDC.

Kalshi settles USD via CFTC clearinghouse, with clearly defined resolution sources (e.g. AP race calls for elections). Betfair settles after the official outcome is registered with the league or agency. Manifold is play-money.

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.

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.

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.