SF July 3 High Temp: Can 68-69°F Hold at 29%?

San Francisco’s July 3 temperature market is a short-fuse contract. Resolution hits tomorrow at noon, and the forecast window is narrow enough that National Weather Service data already constrains the probability range. The 68-69°F band currently sits at 29% implied probability, making it the single most likely outcome in a field of eleven spread across a wide temperature range.

The market question asks for the highest temperature in San Francisco on July 3. The 68-69°F outcome is priced at $0.29 YES, $0.71 NO, with a total volume of $6,377 and liquidity sitting at $31,296. The contract resolves July 3, 2026 at noon. With all $6,377 traded in the last 24 hours, this is a fresh market, not a slow accumulation.

How the July Third San Francisco Temperature Contract Works

YES pays out if San Francisco’s official high temperature on July 3 lands between 68 and 69 degrees Fahrenheit. The resolution source follows the market’s stated criteria, which tracks observed high temperature data for San Francisco. NO covers every other outcome across the ten remaining bands, from 59°F or below through 78°F or higher.

• YES (68-69°F): $0.29 per share, 29% implied probability
• NO (all other bands): $0.71 per share, 71% implied probability

The NO side pays when any band other than 68-69°F records the daily high. San Francisco’s coastal microclimate is notoriously variable. The city’s western neighborhoods can run 10 degrees cooler than downtown on the same afternoon. Official readings from San Francisco International Airport and the downtown Civic Center station diverge regularly. The specific station used for resolution matters, and this market’s tight band means a 2-degree miss sends all NO contracts to full value.

Momentum and Market Signals

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The momentum composite is essentially flat. The 1-hour price change is 0.0%, and with no prior 24-hour baseline available, the trend score of 53.64 reflects a market in equilibrium rather than directional conviction. Price has held at $0.29 since the market opened, with no significant moves recorded. The driver here is not trader sentiment shifting. It is the forecast itself, which the National Weather Service updates multiple times daily as the July 3 window approaches.

Total volume is $6,377, all traded in the last 24 hours. Liquidity stands at $31,296, which is healthy relative to volume for a short-duration weather contract. That said, $6,377 in total volume is well below $1 million, meaning this market can reprice sharply on a single updated forecast or a change in the expected marine layer behavior overnight. Thin volume markets like this one reflect a tight community of weather traders, not broad market consensus.

• The 1-hour price change of 0.0% and a trend score of 53.64 point to no active catalyst in the last hour, consistent with traders waiting on the next National Weather Service forecast update.
• The 24-hour volume matching total volume confirms this market opened fresh within the last day, making every trade part of initial price discovery.
• Liquidity of $31,296 against $6,377 volume means the order book can absorb new bets without dramatic slippage, but a large directional trade could still move the price meaningfully.
• Trader sentiment is strongly bearish on the 68-69°F outcome: 71% of implied probability sits on NO, spread across ten alternative bands.

Lines Analysis: San Francisco Coastal Forecast Mechanics

The 68-69°F band has the highest single-band probability in this market for a reason. San Francisco’s early July climatology centers near 65-68°F at the official downtown station, with afternoon highs pushed higher on days when the marine layer burns off before 1 p.m. A reading in the 68-69°F range requires moderate onshore flow, partial cloud clearing, and no strong delta breeze pushing inland heat into the Bay. That is the most common July 3 scenario, not the extreme. That is why 29% is the leading band even with 71% sitting on NO combined.

The risk to 68-69°F comes from two directions. A stronger-than-expected marine layer keeps the high in the 64-67°F range, which covers three separate NO bands. A weaker marine layer or offshore flow pushes the high into 70-73°F territory, also covered by NO. San Francisco’s July 3 temperature history shows meaningful variance around the 66-72°F range depending on synoptic conditions. The market’s spread across eleven bands reflects that variance honestly. No single outcome can command much above 30% when the temperature distribution is this flat.

Signals to monitor before July 3 noon resolution:

• The National Weather Service San Francisco Bay Area forecast office issues updates multiple times daily. Any shift in the predicted high temperature for San Francisco proper will reprice the leading bands directly.
• Overnight marine layer depth determines morning cloud cover and burn-off timing. A deeper marine layer reported in pre-dawn observations would favor the 64-67°F bands and push NO probability higher on 68-69°F specifically.
• The San Francisco International Airport ASOS station and the downtown observing stations can diverge by 3-5 degrees on marine layer days. The resolution station matters for this 2-degree band market.
• Any change in offshore pressure gradient indicating a Diablo wind event or delta breeze would push probability mass toward the 70°F or higher bands quickly.
• The July 4 holiday weekend historically sees slightly elevated Bay Area temperatures due to reduced coastal fog frequency, but July 3 is still within the core fog season.

Total volume of $6,377 is thin. The data favors no single band with strong conviction. The 68-69°F outcome is the probability leader, but 71% of the market is distributed across ten alternatives. Here is what the measurements are telling us: San Francisco’s marine-influenced July climate makes any 2-degree band a roughly one-in-four-to-one-in-five shot on a normal year. The market is pricing uncertainty, not science. The forecast, not sentiment, will determine whether 29% is cheap or expensive by resolution time tomorrow.

LINES VERDICT

MARGINAL LEADER IN A SPREAD MARKET

The 68-69°F band holds the highest single-outcome probability in a legitimately uncertain temperature spread. The data doesn’t care about the politics, and here, the data says no band deserves strong conviction until the final National Weather Service forecast before noon tomorrow.

What the market says: At 29% implied probability, the market has priced 68-69°F as the most likely single outcome but placed 71% on all alternatives combined. With a same-day resolution and thin volume below $1 million, this price is highly sensitive to any forecast update before the July 3 noon deadline.

Key unknown: The National Weather Service Bay Area forecast update issued on the morning of July 3 is the single most important input. Any shift in the predicted high, driven by overnight marine layer behavior or changing offshore pressure, will reprice every band in this market before resolution.