San Francisco Peak Temp June 12: Can 78-79°F Hold?

San Francisco rarely behaves like a normal American city when it comes to June temperatures. The Bay Area fog machine kicks in, marine layer suppresses afternoon highs, and then some days the inland heat breaks through and surprises everyone. Right now, traders are putting 32% odds on the 78-79°F range for June 12. That’s a meaningful shift. The contract opened at 19 cents and has climbed steadily over two sessions.

The market question asks: what will the highest temperature in San Francisco reach on June 12, 2026? The 78-79°F outcome trades at $0.32 YES and $0.68 NO. The contract resolves at noon on June 12. Total volume stands at $12,829, all of it placed in the last 24 hours.

How the San Francisco Temperature Contract Works

This is a range-outcome contract, not a simple YES/NO on a single threshold. Traders pick the two-degree band they believe will contain San Francisco’s daily high temperature on June 12. The resolution body and data source are the market’s own resolution criteria. Eleven bands are available, from 67°F or below up to 86°F or higher.

• 78-79°F trades at $0.32, implying 32% probability of containing the daily high.
• 76-77°F is the next closest band, representing the cooler alternative outcome.
• 80-81°F is the warmer adjacent band, representing a moderate overshoot scenario.

For this contract to pay NO, the daily high must land in any band other than 78-79°F. San Francisco’s June climate is notoriously compressed. Temperatures above 80°F are possible but require specific offshore flow patterns. Temperatures below 72°F reflect a classic June Gloom day. The spread of remaining probability across ten other bands keeps NO heavily favored by structural math alone.

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Momentum and Market Signals

The momentum composite here tells one clear story: this contract is moving on fresh weather model data. The trend score sits at 51.32, leaning slightly toward upward pressure. The 1-hour price change is plus 6%. Combined with the move from 19 cents to 32 cents over two sessions, the pattern looks like traders updating on a warming forecast rather than speculative noise.

Total volume is $12,829, and all of it landed in the 24-hour window. That’s a thin market by prediction contract standards. Liquidity sits at $36,904, which provides reasonable depth, but any significant new weather model run showing a temperature revision could move this price sharply. Traders should treat this as a market where a single National Weather Service forecast update matters more than accumulated sentiment.

• The 1-hour price change of plus 6% and the two-session run from $0.19 to $0.32 point to forecast-driven buying, not random drift.
• Total volume below $1M means the order book is thin enough that a medium-sized trade can reprice the contract quickly.
• The trend score of 51.32 sits just above neutral, consistent with cautious accumulation rather than strong conviction.
• The 68% NO price reflects the mathematical reality that ten competing bands absorb most of the remaining probability mass.

Lines Analysis: What the Forecast Is Telling Us

Here’s what the measurements are telling us. June in San Francisco runs warmer than reputation suggests when the North Pacific High strengthens and pushes the marine layer offshore. The NWS forecast for the Bay Area through mid-June shows a mild warming pattern developing, consistent with an offshore flow event. That’s the physical driver behind the price move. Traders appear to be responding to model guidance showing daytime highs pushing into the upper 70s for June 12.

The data doesn’t care about the politics, and it doesn’t care about June Gloom mythology either. What would push this contract toward NO is a marine layer reinforcement. If the onshore flow returns stronger than forecast, San Francisco International Airport and downtown stations could land in the 72-75°F range. The distance between a foggy June 12 and a warm one is entirely a function of how far offshore that marine layer retreats by afternoon. That uncertainty is real, and it’s reflected in the 68% NO price.

• NWS Bay Area forecast updates through June 11 are the single highest-priority signal. Any forecast revision upward past 80°F would pressure the 80-81°F band and potentially draw probability away from 78-79°F.
• Offshore wind observations at coastal stations like Half Moon Bay on the morning of June 12 will confirm or deny the warm scenario before market resolution.
• June climatology for San Francisco shows the 75-80°F range captures the majority of warm-day outcomes, which supports the 78-79°F band as the modal warm-day forecast.
• A marine layer reinforcement event, sometimes called a June Gloom surge, would shift probability toward the 72-75°F bands and reprice this contract quickly.

Total volume at $12,829 is thin. The market is pricing uncertainty, not science, and that’s exactly right for a 24-hour weather forecast. The data currently favors the 78-79°F range as the most likely single outcome, but the structural probability spread across eleven bands means no individual outcome exceeds roughly one-in-three odds even on a well-forecast day.

LINES VERDICT

LEADING OUTCOME, UNCERTAIN RESOLUTION

The 78-79°F band is the best single bet in this field, supported by two sessions of forecast-driven buying and a warming pattern consistent with NWS guidance. No single band crosses 50% in a well-distributed eleven-outcome market.

What the market says: 32% probability means traders see this band as the modal outcome but far from certain. The contract resolves June 12 at noon, leaving less than 24 hours for new forecast data to reprice every band simultaneously.

Key unknown: The NWS Bay Area afternoon forecast update on June 11 is the single data point most likely to reprice this contract. A revised high above 80°F or below 76°F would shift probability mass to adjacent bands and move the 78-79°F price sharply in either direction.

San Francisco June Climate: Scientific Context

San Francisco’s June temperature record shows a strong bimodal distribution. Most June days fall between 60°F and 72°F under marine influence. Warm days, defined as highs above 75°F, occur roughly 20-30% of June days historically and cluster during periods of offshore flow. The 78-79°F range sits near the upper end of the warm-day distribution, making it a plausible but not dominant outcome on any given June day. The recent two-session price move from $0.19 to $0.32 suggests current forecast guidance is pointing toward one of those warm-day patterns for June 12.

What moves price before June 12: Any NWS forecast revision, any morning observation showing marine layer retreat or persistence, and any updated GFS or European model run showing temperature departures from current guidance.

How does 32% probability work here?

In an eleven-band market, 32% is actually a strong plurality. It means the market sees the 78-79°F range as the single most likely two-degree window for San Francisco’s June 12 high, even though more probability sits in the remaining ten bands combined.

What pays out if this contract resolves NO?

If the daily high lands in any of the ten other bands, from 67°F or below up through 86°F or higher, the NO side of the 78-79°F contract pays. The market’s 68% NO price reflects that outcome distribution across competing bands.

What data event would move this price most?

The NWS Bay Area zone forecast update, particularly any afternoon or evening update on June 11, is the highest-impact signal. Model guidance showing a revised high of 75°F or 82°F would immediately reprice adjacent bands and deflate the 78-79°F probability.

When does this contract resolve?

Resolution is set for June 12, 2026 at noon. Given that San Francisco’s daily high typically occurs between 1 p.m. and 4 p.m. local time, the resolution methodology should be confirmed before trading. The timing matters for temperature band accuracy.

Is the volume and liquidity here reliable?

Total volume of $12,829 is thin. Liquidity at $36,904 provides some order book depth, but prices in low-volume markets can move sharply on a single trade. Treat current pricing as directional guidance, not a stable consensus estimate.