SF July Two Temperature: Seventy Degrees in Play

San Francisco’s July 2 high temperature is one of the harder weather calls on the prediction market board right now. The leading bracket, a peak of 70-71 degrees Fahrenheit, holds a 43.5% implied probability. That sounds confident until you remember that coastal fog, offshore flow, and afternoon marine layer burn-off can swing SF highs by 10 degrees or more within a single forecast cycle.

The market question asks: what will the highest temperature in San Francisco be on July 2, 2026? The 70-71°F bracket is priced at $0.44 YES and $0.57 NO, with the market resolving at 12:00 p.m. on July 2. Total volume stands at $23,098, with $23,108 traded in the last 24 hours.

How the Contract Works: Temperature Brackets and Resolution

This market resolves based on the official high temperature recorded in San Francisco on July 2, 2026. Each bracket represents a two-degree range. The leading bracket, 70-71°F, pays YES if the official high lands in that range. All other brackets resolve NO. The National Weather Service San Francisco Bay Area office is the relevant authority for official temperature records at the city’s primary weather station.

• 70-71°F resolves YES if the official San Francisco high on July 2 falls between 70 and 71 degrees Fahrenheit. Priced at $0.44, implying 43.5% probability.
• All competing brackets, including 68-69°F, 72-73°F, 66-67°F, and others, resolve NO for this specific contract.

The NO side wins if the San Francisco high lands anywhere outside the 70-71°F range. That is a wide target. The official high could come in at 68 degrees due to a persistent marine layer, or surge to 73 degrees on a dry offshore flow day. Either outcome defeats this contract. Early July in San Francisco is exactly the kind of period where NWS forecast confidence is lowest, because small shifts in the marine layer timing produce large temperature swings.

Momentum and Market Signals: A Sharp Reset on June Thirtieth

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The momentum composite here is notable. A 4.5% hourly price gain against a significant prior-day decline points to a market in active recalibration. The sharp drop on June 30, which pulled the contract down roughly 17.5%, almost certainly followed a weather model update showing a stronger marine layer influence for the July 2 period. The partial recovery in the last hour suggests some traders see the cooler scenario as overdone, or that a subsequent model run shifted the forecast warmer.

Total volume of $23,098 is thin, and 24-hour volume of $23,108 effectively equals the full market volume, meaning almost all trading activity happened in the last day. Liquidity at $57,103 is relatively deep compared to volume, but thin overall volume means a single large trade could move this price meaningfully. The data here reflects a market that just woke up, not one with months of settled conviction.

• The 1-hour price gain of 4.5% and trend score of 45.61 together signal short-term buying pressure, likely tied to an updated NWS forecast favoring warmer afternoon temperatures on July 2.
• The June 30 price drop points to a marine layer forecast that spooked the market away from the 70-71°F bracket and toward cooler alternatives like 68-69°F.
• Volume of $23,098 total is below $1 million, meaning thin liquidity conditions apply. This price can move sharply on the next forecast model run.
• Liquidity of $57,103 provides some buffer, but with such low total volume, the 43.5% implied probability reflects a small sample of trader conviction.
• Open interest at $0 suggests positions are being actively traded and closed, not held, which is consistent with a short-horizon weather market.

Lines Analysis: What San Francisco’s Marine Layer Is Telling Us

The 70-71°F bracket leads because it sits at the sweet spot of early July San Francisco climatology. When the marine layer burns off by early afternoon, downtown SF and surrounding stations frequently reach the low 70s on days with moderate offshore flow. The NWS Bay Area office’s forecasts for this period carry above-average uncertainty because the timing of fog dissipation is highly sensitive to overnight conditions that are still evolving. Here’s what the measurements are telling us: the market priced this bracket at 50 cents as recently as before June 30, then cut that sharply when forecast models showed a more persistent marine layer.

The real risk to the 70-71°F bracket is a marine layer that holds through the afternoon. If fog and low clouds persist past noon, the official high could land in the 66-69°F range without any dramatic shift in the synoptic pattern. The competing 68-69°F bracket is the most likely alternative outcome. The data doesn’t care about the politics of which bracket wins. A stronger-than-expected low-pressure system offshore, or a weaker-than-forecast thermal trough inland, could push the high well below 70 degrees and defeat this contract cleanly.

• The NWS San Francisco Bay Area office’s next forecast discussion update is the single most important signal. Any language about marine layer persistence or offshore flow strength will directly reprice the leading brackets.
• The 68-69°F bracket gaining volume would signal the market shifting toward the marine layer scenario and away from 70-71°F.
• Morning temperature readings on July 2 at SFO and downtown SF stations will indicate whether the marine layer has cleared, providing a real-time resolution signal before noon.
• Any jump in the 72-73°F bracket price would signal traders pricing in an offshore flow event, which would also defeat the 70-71°F contract but in the opposite direction.

Total volume of $23,098 limits how much weight to place on the current 43.5% probability. The data favors the 70-71°F bracket as a climatological baseline, but the June 30 forecast shift introduced genuine uncertainty. The market is pricing uncertainty, not science, here. The next NWS model update before July 2 is what resolves this.

LINES VERDICT

LEADING BRACKET, GENUINE UNCERTAINTY

The 70-71°F bracket leads on climatological grounds, but the June 30 forecast reset introduced real competing risk from the cooler brackets. San Francisco’s marine layer is the deciding variable, and no model has locked that in.

What the market says: A 43.5% implied probability means traders rate this the most likely single outcome but still give a coin-flip or worse chance it lands elsewhere. With a July 2 noon resolution and thin total volume below $25,000, this price will move sharply on any new NWS forecast data before resolution.

Key unknown: The NWS San Francisco Bay Area forecast discussion issued in the hours before July 2 noon, specifically any update on marine layer burn-off timing and offshore flow strength, is the single data point that will reprice every temperature bracket in this market.