Highest temperature in Sao Paulo on July 23?

Platform comparison

Market context

The relevant real-world event is the highest temperature recorded at São Paulo–Guarulhos International Airport on 23 July, with the contract settling to the temperature band containing that daily peak. On the prediction market, the two leading outcomes are tightly grouped, with **24°C** and **25°C** each implied at **28%**, so the crowd is effectively split between adjacent bins rather than pricing a single clear favourite.[1]

That pattern fits São Paulo’s July climatology, where typical daytime highs are around **23°C** and nights are much cooler, so a mid-20s print is broadly consistent with seasonal norms.[3] The current market is therefore not treating the contract as a heat-event wager, but as a question of whether the day lands a degree or two above the usual July maximum. For comparison, there is no sportsbook-style line here to anchor against, so the main benchmark is the prediction-market curve itself, which shows limited conviction and little separation between the top bands.[1][3]

For traders, the key drivers are the short-term forecast and any cloud or rain changes over the airport area, because even modest afternoon convection can cap the day’s maximum below the upper-20s bins. Live weather services currently show São Paulo with rain in the outlook and only a moderate daytime high, which supports a relatively compressed distribution rather than a strong upside skew.[2] The practical catalyst is the intraday evolution of local conditions before the settlement window closes, since the final reading comes from the airport station rather than the city centre, making the outcome sensitive to microclimate differences as well as the broader São Paulo forecast.[1][2]

Sources: 1 · 2 · 3

Methodology

This page reviews Highest temperature in Sao Paulo on July 23? 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 Best Prediction Markets, 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 Best Prediction Markets. 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.

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.