Highest temperature in Madrid on August 16?

Platform comparison

Market context

Madrid's maximum temperature on 16 August 2026 will be measured at Adolfo Suárez Madrid-Barajas Airport and recorded in Weather Underground's Daily Observations table. The market currently prices all outcome ranges at 0% YES, reflecting the settlement window's closure date of 12:00 UTC on that day. Traders are pricing conditional tokens on USDC via Polygon, with resolution contingent on the specific data source hierarchy: Daily Observations takes precedence over the Day High & Low summary section should any discrepancy arise.

August temperatures in Madrid typically peak between 35–40°C, with historical records showing extremes near 42–43°C during heat waves. The city experienced 40.5°C on 16 August 2012 and 41.4°C on 13 August 2022, establishing the baseline for evaluating outcome ranges. These precedents suggest that mid-range brackets (36–38°C and 38–40°C) historically capture the most probable outcomes, whilst extreme ranges above 40°C occur during specific atmospheric conditions rather than routine summer days.

Traders should monitor European weather forecasting updates from mid-August 2026, particularly ECMWF and Météo-France models issued 10–14 days prior. Iberian heat-wave patterns typically correlate with Saharan air masses and high-pressure systems tracking northward; any advisory from Spain's State Meteorological Agency (AEMET) regarding exceptional heat would signal material shifts in market pricing. The airport station's elevation and urban heat-island effects relative to surrounding regions also influence final readings, making local microclimatic conditions relevant to outcome assessment.

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 PolyGram, 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.

UK Frequently Asked Questions

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 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.

Is Polymarket legal in the UK?

Polymarket is accessible to UK traders but is not UKGC-licensed. It operates under US CFTC jurisdiction. UK residents face no domestic legal prohibition on using it, but UKGC consumer protections do not apply. For UKGC-regulated alternatives, Betfair Exchange and Smarkets offer similar prediction-style markets.

Do I pay tax on prediction market profits in the UK?

UKGC-licensed platform profits (Betfair, Smarkets) are typically tax-free gambling winnings for UK individuals. Polymarket profits involve USDC crypto transactions, which HMRC treats as Capital Gains Tax events. Keep full transaction records and report via Self Assessment if gains exceed £3,000 per tax year.

How do I deposit on Polymarket from the UK?

UK traders typically fund Polymarket via Coinbase UK, Kraken or Revolut — buying USDC with GBP and transferring to a Polygon-compatible wallet (MetaMask, Coinbase Wallet). Polymarket's onboarding walks you through the bridging process. Typical GBP-to-USDC conversion costs 0.5–1%.