Highest temperature in Sao Paulo on July 6?

Platform comparison

Market context

The underlying event is the daily peak temperature at São Paulo-Guarulhos International Airport on 6 July 2026, a date historically defined by winter cooling in Brazil’s southeast. Current crowd-implied probability of 0% for any high-temperature bracket reflects the seasonal reality: July is São Paulo’s coldest month, with average highs near 22°C (72°F) and lows around 13°C (56°F)[3]. While Brazil has recorded extreme heat elsewhere—such as Rio’s 39°C street reading in 2024 or the national record of 44.8°C in 2023—these anomalies occurred in summer or coastal zones, not in mid-winter inland São Paulo[1][2]. Historical data confirms São Paulo’s hottest day reached 38.5°C only in November 2023, reinforcing that July highs rarely exceed 25°C[8]. For a programmatic trader, this 0% probability is not an error but a structural alignment with climatology; conditional orders targeting high-temperature brackets would be ill-advised without a sudden, unforecasted heatwave.

Traders monitoring this market should watch for real-time weather alerts from INMET (Brazil’s national meteorology institute) and Wunderground’s live station feed, which resolves the outcome[market description]. A catalyst would be an official forecast of a “cold front retreat” or “subtropical ridge intensification,” both capable of pushing temperatures above 28°C, though such events are statistically rare in July. Recent news from Al Jazeera notes a 2024 heatwave that scorched Rio, but it did not extend to São Paulo’s winter core[1]. No scheduled announcements or climate dependencies currently suggest a deviation from baseline winter conditions. For copy-trading bots, the optimal strategy is to avoid high-temperature brackets entirely; the structural math of multi-bracket markets favors the NO side unless Wunderground reports an unprecedented spike, which historical records do not support for this date[9]. The settlement window ending 12:00 UTC on 6 July 2026 ensures resolution before afternoon peaks, further reducing volatility.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote, four reference venues with their key attributes, and a single execution path — every trade button routes to Polymarket Review UK, which mirrors the Polymarket order book directly.

Resolution & payout

Settlement runs on-chain. Polymarket's contract logic separates YES and NO shares as conditional tokens; at resolution the winning share lifts to $1.00 and the losing one to $0. The outcome input comes from the UMA Optimistic Oracle, which secures against bad resolution with a bond + dispute window.

Once finalised, the smart contract pays USDC to the holders' wallets within minutes — no withdrawal fees beyond Polygon network gas. Kalshi settles in USD via CFTC clearance, Betfair in account currency net of commission, Manifold in play-money mana with no cash-out.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Review UK. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

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.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Review UK trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.