Highest temperature in NYC on August 2?

Platform comparison

Market context

New York’s peak temperature on 2 August will be measured at LaGuardia Airport, so the trade is really about whether the city gets a modest summer high or a sharper afternoon spike. Wunderground’s history page is the settlement source, and the current market is already pricing a very low chance of an extreme result, with the crowd-implied “YES” probability at 0% for the specified threshold structure. On Polymarket, that means the quoted percentage is the direct share price; on Kalshi or Smarkets, the same view is usually expressed through contract pricing and the exchange’s fee schedule, while Betfair typically shows decimal odds that need converting back into implied probability after commission.

Recent heat shows why traders should not over-read a single cool-leaning forecast. On 2 July, LaGuardia reached 104°F, well above its earlier same-day record, and the city briefly hit 100°F in Central Park during the same heat wave.[18][6] That makes late-summer heat a live possibility rather than a tail event, but the market settles only on the highest reading at LaGuardia on 2 August, not the borough-wide experience. For comparison, New York’s August climatology usually sits in the low 80s°F, which aligns more with middling outcome bands than with the very top buckets.[1]

The main catalysts are the day’s forecast updates, cloud cover, wind direction and any convective showers that cap the afternoon high or, less often, allow a late surge before the noon UTC settlement window closes. The official Wunderground history entry will ultimately control, so traders should watch whether later model runs move LaGuardia towards the 80s or keep it pinned nearer the upper 70s.[3][10] Platform differences matter here: Polymarket’s displayed probabilities are easier to compare across bands, Betfair’s decimal odds include exchange commission, and Kalshi and Smarkets can differ materially on who can access the book and whether local KYC restrictions apply.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We read Highest temperature in NYC on August 2? from four platform perspectives: Polymarket (on-chain CLOB), Kalshi (CFTC-regulated exchange), Betfair Exchange (sports book exchange), Smarkets (peer-to-peer betting exchange). Polymarket's live mid is the canonical probability; the side-by-side columns benchmark fees, KYC, settlement currency and deposit rails so you can choose the venue that fits your jurisdiction and trade size.

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

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.

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. Kalshi Alternative UK 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.