Highest temperature in Istanbul on July 22?

Platform comparison

Market context

Polymarket is currently pricing this contract with **31°C** as the clear frontrunner at **90%**, while **32°C** sits at **10%**, so the book is already leaning heavily towards a warm but not exceptional peak at Istanbul Airport. The market resolves off NOAA’s highest **Temp** reading for the day at **LTFM**, converted to the relevant Celsius range, and the position is held via on-chain **conditional tokens** on **Polygon** and settled in **USDC**.

For context, July in Istanbul is usually hot rather than extreme: the typical high is about **29°C**, with average lows near **21°C**. That means a 31°C print is only modestly above seasonal norms, which helps explain why the market has concentrated around a single band rather than spreading across several hotter outcomes. In prediction-market terms, a 0% YES implies the crowd sees the named outcome as very unlikely to be the eventual top reading, but the contract still depends on the final NOAA table rather than local forecasts alone.

The main thing to watch is the NOAA data publication itself, because this market cannot resolve until the first reading for the following day appears. That makes late-afternoon and overnight updates important if the airport’s peak temperature arrives near the end of the reporting window. Traders also need to remember the settlement reference is the official NOAA site for Istanbul Airport, so any operational quirks in the time-series display matter more here than headline forecasts or city-wide weather summaries.

Sources: 1 · 2

Methodology

Methodologically we separate two layers: the live probability (Polymarket mid-price) and the platform attributes (fee, KYC, settlement currency, payment rails). That keeps the comparison honest — a single canonical probability across the row, with the venue-by-venue trade-offs spelt out in the columns next to it.

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 Kalshi UK. 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.

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.