Highest temperature in Munich on August 18?

Platform comparison

Market context

Munich is set up for a subdued afternoon maximum rather than a heat spike, with the current contract’s 0% yes price sitting well below the temperatures implied by most forecast guidance. AccuWeather’s August outlook for Munich shows highs for 18 August in the mid-60s Fahrenheit, while other August climate guides cluster around the low-20s Celsius, consistent with a relatively mild day rather than anything near a high threshold outcome.[1][2][3]

That leaves the main question as how much upside there is from the forecast model spread, not whether the market can settle in an extreme band. Historical August conditions in Munich are usually temperate, and the current pricing appears to reflect that baseline, while the only meaningful divergence is between the market’s zero-implied chance and the forecast range, not between competing venues.[1][2][3] The key catalyst is whether cloud cover and cooler westerly flow persist through the settlement window; Polymarket’s event page notes ECMWF and DWD clustering Munich’s 18 August maximum near 19–20°C, which would keep the reading close to the middle of the usual late-summer range and well away from hotter bands.[4]

Sources: 1 · 2 · 3 · 4 · 5

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

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

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.