Highest temperature in San Francisco on August 13?

Platform comparison

Market context

San Francisco's weather on 13 August 2026 will be shaped by typical late-summer conditions in the Bay Area, where marine layer influence and proximity to the Pacific Ocean constrain daytime highs even during peak summer months. The settlement mechanism relies on Weather Underground's Daily Observations table from San Francisco International Airport Station, which records granular temperature readings throughout the day rather than relying on summary high-low figures that may differ slightly.

Historical August temperatures at SFO show a median high around 72–75°F, with readings rarely exceeding 80°F due to persistent coastal cooling. The 0% crowd probability suggests traders are pricing in either a notably cool day or uncertainty about whether extreme heat will materialise. August typically sees San Francisco's warmest conditions in early-month windows before marine influence strengthens; by mid-August, afternoon sea breezes frequently cap temperatures. The airport's location on the peninsula amplifies this moderating effect compared to inland Bay Area stations.

Traders should monitor National Weather Service forecasts released in the week preceding 13 August, which will clarify whether high-pressure systems or thermal troughs dominate the region. Atmospheric river activity or unusual ridge positioning could push temperatures above historical norms, though such scenarios remain statistically uncommon for this date. Real-time Weather Underground data feeds will be critical for settlement verification, particularly distinguishing between the Daily Observations granular readings and any Day High & Low summary discrepancies.

Methodology

Sports-specific comparison page for Highest temperature in San Francisco on August 13?. Polymarket's live quote (Polygon order book) plus platform attributes for the three reference venues. Sports markets reward liquidity — Polymarket and Betfair are materially deeper than Kalshi or Manifold.

Resolution & payout

Sports markets typically settle on official final-whistle plus league confirmation. Polymarket uses UMA Optimistic Oracle with a source URL per contract — usually official league data feeds or ESPN/Soccerway. Two-hour dispute window, then smart-contract payout in USDC.

UK Frequently Asked Questions

Can I bet on individual matches?

Yes, Polymarket lists every major Premier League / Champions League / World Cup match as its own market. Liquidity varies — top matches like El Clásico or a semi-final often have six-figure pools, lower-league games closer to three-figure.

What are live sports odds on Polymarket?

Some top-tier matches stay open during play — you can trade the half-time probability in the 70th minute. Polymarket mid-prices update second-by-second; any frontend mirroring the order book shows the same movement.

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%.