Highest temperature in Istanbul on July 4?

Platform comparison

Market context

The market’s current 0% YES probability for any temperature above the lowest range is a sharp, real-time correction driven by a sudden influx of northerly flow and increased cloud cover over the Istanbul region in the last 24 hours. This atmospheric shift has capped daytime warming significantly, pushing the collective consensus toward a high of 25–27°C, a stark departure from the intense, dry heat typically expected in early July. Traders landed here seeking this immediate update, not historical background, as the weather pattern has fundamentally altered the settlement outlook for 4 July 2026.

Historically, Istanbul’s July highs average 27–31°C, with long-term data showing daytime peaks rarely falling below 25°C unless significant cloud interference occurs [3][5][6]. The current crowd-implied probability of 0% for higher ranges aligns with the rare but documented cases where northerly winds suppress temperatures to the 25–26°C band, as seen in recent Polymarket trades where 26°C now commands a 97% probability [2]. This frames the current odds not as an anomaly, but as a precise reflection of the prevailing northerly flow and reduced solar exposure.

Traders should monitor the NOAA hourly updates for Istanbul Airport (LTFM) specifically for the "Temp" column, as the settlement hinges on the first data point published for 4 July [1]. The key catalyst is the persistence of the northerly flow; any sudden shift to southerly winds or clearing skies could rapidly alter the temperature trajectory. Recent forecasts confirm the current cloud cover and northerly trend will persist through the settlement window, reinforcing the 25–27°C consensus [2]. No major weather announcements are scheduled, but real-time NOAA data remains the definitive dependency for resolution.

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 Prediction Today, which mirrors the Polymarket order book directly.

Resolution & payout

At resolution the UMA oracle takes over: a proposer posts the outcome with a bond, any token holder can dispute within two hours. Without dispute the result is accepted and the smart contract distributes USDC instantly.

On Kalshi (CFTC-regulated) resolution runs through their in-house clearing engine in USD. Betfair Exchange settles after match end in the account's local currency. Manifold pays no cash — only its in-platform "mana" currency.

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 Prediction Today. 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.