Highest temperature in Sao Paulo on July 23?

Platform comparison

Market context

The highest temperature recorded at São Paulo–Guarulhos International Airport on 23 July will be the settlement value, so the practical question is where the day’s peak lands on the Celsius ladder and whether it finishes in the chosen range. With the settlement window ending at 12:00 UTC, a programmatic workflow would typically keep polling the Wunderground history page, convert the posted high into Celsius if needed, and map it to the market’s outcome bands as soon as the daily record updates.

For framing, July in São Paulo is usually cool by local standards: one weather guide puts the typical July high at about 23°C, with average humidity around 76%[3]. That sits neatly in the centre of the market’s implied pricing, where 23°C is the current frontrunner at 28% and 24°C is next at 24%[2]. For a trader using conditional orders or a bot, that distribution signals a fairly tight clustering around the low-to-mid 20s rather than a broad tail, which means small forecast changes can shift the lead outcome quickly[2].

The live weather setup matters more than any fixed seasonal average. Current forecast material points to patchy rain nearby, a daytime high around 76°F, and a 72% chance of rain in São Paulo[1]. Rain can cap the afternoon maximum if it arrives early, while breaks in cloud cover can still allow a mid-20s reading at the airport. A systematic trader would watch the latest airport forecast, precipitation timing, and any intraday temperature trend, then compare those inputs against the market’s spread across adjacent Celsius bins rather than anchoring solely on the seasonal norm[1][2].

Sources: 1 · 2 · 3

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 Kalshi Fees, which mirrors the Polymarket order book directly.

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

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.

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.