Pronóstico: Highest temperature in Sao Paulo on June 30?

Platform comparison

Market context

The underlying real-world event is the highest temperature recorded at São Paulo-Guarulhos International Airport on 30 June 2026, a date that historically falls within the city’s cool, dry winter. Long-term averages suggest daytime maximums of 22°C, with peaks rarely exceeding 25°C and frequent overnight lows near 16°C [1]. Recent data from June 2026 confirms this pattern: the highest maximum recorded was 25.7°C on 22 June, while the warmest 10-day period averaged only 16.7°C [2][4]. Given that temperatures above 30°C are exceptionally rare in São Paulo during June, the current 0% YES probability for a high-temperature outcome aligns tightly with historical climatology [1][6].

Traders should monitor any unusual atmospheric shifts, such as sudden inversions or unseasonal heat advection from the interior, though these are statistically improbable in mid-winter. The settlement relies exclusively on Wunderground’s daily high for SBGR, so verification of data integrity from that source is critical once the day closes [4]. No major weather announcements or scheduled climate events are expected to disrupt June’s typical stability, but traders should watch for real-time updates from AccuWeather or local meteorological services if anomalies emerge [3][7]. With the market resolving on USDC via Polygon using conditional tokens, the on-chain mechanics ensure transparent, automated settlement once Wunderground publishes the official figure [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page reviews Pronóstico: Highest temperature in Sao Paulo on June 30? across five venues. The live probability is the Polymarket mid-price, sourced directly from the on-chain Polygon order book; the comparison columns benchmark each venue on fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Argentina, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

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 Argentina. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Polymarket itself is geo-blocked in the US/UK/EU. Always check the legal status of prediction markets in your jurisdiction before trading.

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.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.