Platform comparison
| Platform | YES odds | NO odds | Fee | KYC | Settlement | |
|---|---|---|---|---|---|---|
Polymarket (via Is Kalshi Legal in California) Pick polygram.ink (preferred broker) |
100% | 0% | 0% (USDC on-chain) | No-KYC up to $1,500 | USDC, auto via UMA oracle | Go to the live market → |
Polymarket (direct) polymarket.com |
100% | 0% | 0% | Geo-blocked in US/UK/EU | USDC, on-chain | Go to the live market → |
Kalshi kalshi.com |
— | — | Up to 7% per trade | US-only, KYC required | USD | Go to the live market → |
Betfair Exchange betfair.com |
— | — | 2-5% commission | Full KYC from first trade | GBP / EUR | Go to the live market → |
Manifold Markets manifold.markets |
— | — | Play-money (mana) | None — play-money | Mana (no cash-out) | Go to the live market → |
Outcome probabilities
Current market-implied probability for each outcome, from the live order book.
| Outcome | Probability |
|---|---|
| 80-81°F | 100% |
| 71°F or below | 0% |
| 72-73°F | 0% |
| 74-75°F | 0% |
| 76-77°F | 0% |
| 78-79°F | 0% |
| 82-83°F | 0% |
| 84-85°F | 0% |
| 86-87°F | 0% |
| 88-89°F | 0% |
| 90°F or higher | 0% |
Market context
The underlying event is the peak daytime heat at San Francisco International Airport on 14 July 2026, measured in degrees Fahrenheit and resolved via Wunderground history. Current crowd pricing shows a 93% implied probability for the 78–79°F range, with 80–81°F as the only other meaningful contender, while any outcome below 78°F or above 81°F is effectively priced at zero [1]. This tight distribution mirrors typical midsummer marine-influence patterns in the Bay Area, where the Pacific current usually caps highs just below 80°F despite clear skies.
Regulatory framing matters for accessibility: German GlüStV rules could restrict participation for residents unless the platform qualifies as a licensed gambling operator, while US CFTC reach remains ambiguous for weather-based prediction markets that lack commodity-futures characteristics. The “no-KYC up to $1,500” threshold means traders can access this market without identity verification for stakes under that limit, provided the platform’s jurisdictional setup permits it, but larger positions will trigger compliance checks. These constraints do not alter the meteorological outcome but define who can trade and how capital moves.
Traders should monitor the National Weather Service’s 72-hour forecast for the San Francisco Bay as it nears the settlement date, particularly any shifts in the high-pressure ridge over the Pacific Northwest that could weaken coastal cooling. A sudden inland heat surge, such as those seen in July 2023 when temperatures briefly hit 84°F in downtown SF, would be the primary catalyst for a breakout above 79°F, though current models show no such anomaly developing [1]. Settlement depends solely on the official station record at KSFO, not city-wide averages.
Sources: 1
Methodology
This overview of Highest temperature in San Francisco on July 14? reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.
Resolution & payout
On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.
FAQ
- Is Polymarket legal in my country?
- Polymarket is geo-blocked in the US/UK/EU. Actual usage via the Polymarket interface is not possible there. The legal status itself varies — many countries treat prediction markets as a gray area. Is Kalshi Legal in California has a different geo footprint.
- Do I need to KYC for Is Kalshi Legal in California?
- Not for lifetime trading volume under $1,500. Above that threshold, a quick KYC flow kicks in — ID, selfie, approximately 5-10 minutes. The threshold matches FATF travel standards for unregulated crypto platforms.
- How are winnings taxed?
- Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
- Can I trade anonymously?
- Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
- What happens during a tax audit?
- You're responsible for documenting your trades. Is Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
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