Highest temperature in Seattle on July 22?

Platform comparison

Market context

Seattle-Tacoma International Airport is a late-July airport-weather market, and the crowd’s 0% YES pricing implies traders currently assign no chance to the relevant temperature band being hit on 22 July 2026. That is a platform-comparison signal as much as a weather signal: on Polymarket, the same contract family is usually shown as a straight implied probability, whereas Kalshi and Betfair-style books tend to present odds in different formats, so the same view can look much cheaper or more expensive depending on whether fees, spreads, and conversion from decimal odds are included. For a market settled from Wunderground’s SeaTac station data, the important detail is that the final number is the day’s **highest** reading, not the noon observation or the daily average.

July in Seattle is usually stable rather than extreme, which makes airport-temperature bands easier to frame than on genuinely volatile summer-weather days. Typical July highs are around the low-to-mid 70s Fahrenheit, with average daily highs near 73–75°F across common climate references, and long sunny spells are normal, so modest upward or downward deviations tend to matter more than rain risk. That historical profile is relevant when comparing markets because a low quoted probability on one venue can reflect both the weather distribution and the way each platform handles resolution bands, fees, and user access: Kalshi is US-regulated and KYC-gated, Betfair is exchange-style with liquidity and commission considerations, and Smarkets also uses exchange pricing, so the same temperature range can trade at different effective prices.

For the final settlement, traders usually watch the short-range forecast for SeaTac, any marine-layer or inland-heat setup, and whether nearby synoptic conditions are shifting towards a warmer afternoon than normal. The main catalyst is not an announcement, but forecast updates from the National Weather Service and other forecast desks as the date approaches, because a clear high-pressure ridge or stronger onshore flow can move the day’s peak by several degrees. For a July 2026 contract, the practical edge comes from comparing venue pricing against those forecast changes rather than from one-off news items.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Seattle on July 22? 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 Kalshi Alternative, which mirrors the Polymarket order book at 0% fees.

Resolution & payout

Settlement is the biggest difference between the four platforms: Polymarket on-chain in USDC (instant), Kalshi USD via CFTC (T+1), Betfair and Smarkets in local currency via bank withdrawal (T+1 to T+3). On-chain settlement clears in minutes — the fastest payout path of the four.

FAQ

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. Kalshi 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.

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Kalshi Alternative offers a fiat on-ramp via Klarna or SOFORT (DE/AT/CH) and converts internally to USDC for the Polymarket order book. T+1 processing.