Highest temperature in Seattle on July 16?

Platform comparison

Market context

Seattle-Tacoma International Airport is expected to record a high temperature on 16 July 2026, with the crowd heavily favouring the 64–65°F range at 68% implied probability, while the 66–67°F bracket holds 19% [1]. Historical July data for Seattle shows daytime highs typically reaching 24°C (75°F), though recent forecasts suggest a cooling trend as a Pacific cold front moves in, potentially lowering temperatures by the end of the week [2][4]. The current 0% YES probability on the highest-temperature outcome likely reflects a specific threshold not yet defined in the query, but the market’s distribution aligns with moderate summer conditions rather than extreme heatwaves.

Traders should monitor the arrival and intensity of the incoming cold front, which forecasters expect to bring relief to Seattle by Friday, potentially capping highs below 70°F [4]. No official announcements or scheduled dependencies are pending beyond standard weather model updates, but real-time Wunderground data for KSEA will determine settlement [1]. On Polymarket, outcomes are priced as implied probabilities, whereas Kalshi uses decimal odds and Betfair/Smarkets operate on traditional decimal pricing with varying fee structures and KYC requirements. This divergence affects how traders interpret risk: Polymarket’s 68% for 64–65°F translates to roughly 1.47 decimal odds, a conversion not automatic on other platforms.

The settlement window closes at 12:00 UTC on 16 July 2026, with resolution sourced exclusively from Wunderground’s daily history for KSEA [1]. While Seattle rarely experiences extreme heat in July, the 2026 forecast indicates a cooling shift, making the 64–65°F range the most probable outcome. Platform differences in fee models and identity verification may influence liquidity depth, with Polymarket offering broader access but Kalshi providing regulated US compliance.

Sources: 1 · 2 · 3 · 4

Methodology

This page compares Highest temperature in Seattle on July 16? specifically across Polymarket, Kalshi, Betfair Exchange and Smarkets. The live probability is the Polymarket mid; the comparison columns summarise each venue's fee structure, KYC, settlement currency and payment rails. Every CTA routes to Polymarket Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Polymarket settles via UMA Optimistic Oracle on Polygon. A proposer posts the outcome with a bond, the two-hour window runs, then the smart contract pays USDC.

Kalshi settles USD through the CFTC-regulated clearinghouse — the cleanest variant, with heavier KYC. Betfair Exchange settles in account currency (GBP/EUR), net of 2-5% commission. Smarkets follows the same model as Betfair with a lower default 2% commission.

FAQ

Polymarket vs Kalshi — which is better?

Depends on your location. Kalshi is CFTC-regulated, US-only with full KYC. Polymarket is global, on-chain, no KYC up to $1,500. Polymarket has ~10x higher liquidity but higher regulatory risk.

Is Betfair a Polymarket alternative?

Only partially. Betfair Exchange is UK-focused with a sports-betting emphasis; they have politics markets but with thinner liquidity than Polymarket. Settlement in GBP/EUR, 2-5% commission on winnings.

What about Smarkets as an alternative?

Smarkets is a UK betting exchange with a lower default commission (2%) than Betfair. Liquidity on political markets is below Polymarket, comparable to Kalshi. Geo-blocked in many jurisdictions.

Which platform is accessible globally?

Polymarket is geo-blocked in the US/UK/EU. Kalshi is US-only. Betfair and Smarkets are UK-restricted. Polymarket Alternative has a different geo footprint and routes to Polymarket's order book at 0% fees.

Are all these platforms regulated?

No. Kalshi is CFTC-regulated (US). Betfair and Smarkets are UK Gambling Commission licensed. Polymarket operates without explicit regulation — a different risk profile than a regulated sportsbook.