Highest temperature in Istanbul on May 25?

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Market context

Istanbul's weather on 25 May 2026 will be measured against NOAA's official temperature records from Atatürk Airport (LTFM), with the day's peak temperature determining which range resolves affirmatively. Late May in Istanbul typically sees highs between 26–28°C, though heat waves can push readings above 30°C. The settlement window closes at midday UTC, meaning traders must wait for the full diurnal cycle to complete before NOAA finalises its hourly data.

Historical May temperatures at Istanbul Airport show considerable year-to-year variance. The 30-year average high for late May sits around 27°C, but 2023 recorded a peak of 31.2°C on 25 May, whilst 2019 saw only 23.8°C on the same date. This 7.4°C spread reflects the Mediterranean's influence and the city's susceptibility to both cool maritime air masses and hot continental systems pushing northward from the Sahara. The 0% crowd probability suggests either extreme confidence in a narrow range or insufficient liquidity attracting initial traders to this specific market.

Traders should monitor European weather forecasts from mid-May onwards, particularly tracking high-pressure systems developing over North Africa and the Balkans. The Turkish Meteorological Institute publishes extended outlooks that often align with NOAA's eventual readings. Deposit friction remains material for UK-based traders; Klarna's instalment payment option and SEPA rails reduce capital requirements for position entry, whilst USDC on-ramps enable faster settlement once NOAA data publishes. Book depth typically improves as the event date approaches and weather models converge on more reliable predictions.

Methodology

This page reviews Highest temperature in Istanbul on May 25? across five venues. We show live odds for Polymarket-based markets (sourced from the Polygon order book); for other venues we list platform attributes, since the comparable contracts are not exposed via a public API on every venue. Every CTA points at PolyGram — the application we operate, where you trade directly against the Polymarket order book at 0% fees.

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

Is this market available outside the US?

PolyGram is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

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.

Do I need to KYC for this market?

Not under $1,500 of lifetime trading volume. Above that threshold, PolyGram triggers a quick verification flow that finishes in minutes.