Highest temperature in Houston on August 9?

Platform comparison

Market context

Houston’s daytime high on 9 August is the figure that matters here, and the current 0% yes pricing sits against a forecast environment that still points to a hot Houston summer rather than an exceptional outlier. AccuWeather’s August outlook has daily highs mostly in the 90s, with the month’s average high at 95°F, while the National Weather Service was calling for a high near 92°F for Houston Hobby on the morning of 9 August and Weather Underground showed 92°F/79°F at 7:06 am CDT[1][9][10]. For this market, the resolution hinges on the highest temperature in Weather Underground’s Daily Observations table, not the day-high summary, so traders need the station-level observation path, not the headline forecast, to decide the outcome[10].

On comparable Houston temperature markets, the key read is usually whether the day reaches the low 90s or pushes a few degrees higher, because that is where the settlement bands tend to separate. The current crowd-implied probability of 0% YES is also easier to compare across venues than across contracts: Polymarket displays the market directly as an implied probability, while Kalshi and Robinhood-style books are typically framed in cents or dollars per contract, and Betfair or Smarkets instead show decimal odds that must be converted back into implied probability. Fees and access also differ materially: exchange-style venues commonly charge commissions and may have broader or narrower KYC and jurisdictional limits, so the same weather view can trade at different effective prices even when the underlying expectation is unchanged.

The main catalysts are the final Houston Hobby observations on the day itself, plus any late-afternoon thunderstorm development that could cap the maximum temperature before 6 pm local time; the NWS forecast already showed only a slight chance of storms and a low of 79°F overnight, which matters more for the low market than this one[8][9]. Traders should also watch for updates from the airport station feed that flow into Weather Underground’s Daily Observations, since that is the settlement source and can differ from the summarised day-high display[10][12].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares Highest temperature in Houston on August 9? 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 Robinhood Prediction Markets, 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

What does Polymarket cost vs Kalshi?

Polymarket: 0% fees, only Polygon network costs (~$0.01/trade). Kalshi: up to 7% per trade plus spread. For high-frequency traders, Polymarket is dramatically cheaper.

Which platform has the deepest liquidity?

Polymarket — by a wide margin. Top markets reach $50-500M volume, Kalshi ~$200M cumulative, Betfair similar. Deeper liquidity means your trade moves the quote less.

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.

Which platform is accessible globally?

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

Which platform supports Klarna/SOFORT?

Directly: none. Polymarket accepts only USDC on Polygon. Robinhood Prediction Markets 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.