San Francisco June 1 High Temp: Will It Hit 68°F?

San Francisco’s daily high temperature is one of the most notoriously unpredictable numbers in American meteorology. The city’s microclimate swings are legendary, and the market for June 1’s peak reading reflects exactly that tension. Traders currently price a 65% chance that the highest temperature on June 1 reaches 68°F or above, a level that sits meaningfully above the city’s typical early-June baseline.

The market question asks: what will be the highest temperature in San Francisco on June 1, 2026? The 68°F-or-higher outcome sits at $0.65 YES and $0.35 NO. The contract resolves on June 1, 2026 at 12:00 PM. Total trading volume is $2,380, all of it placed within the last 24 hours.

How the San Francisco Temperature Contract Works

This contract resolves to the outcome bracket that matches San Francisco’s official daily high temperature on June 1, 2026. The 68°F-or-higher bracket pays out if the peak reading at the official measuring station meets or exceeds that threshold. All other brackets, including 66-67°F, 64-65°F, 62-63°F, and several lower ranges, represent alternative outcomes with their own implied probabilities.

• 68°F or higher: $0.65 (65% implied probability)
• 66-67°F: lower probability bracket
• 64-65°F: lower probability bracket
• 62-63°F and below: remaining distribution

The NO side of the 68°F-or-higher contract pays out when San Francisco’s daily high on June 1 lands anywhere below 68°F. That covers an enormous range of outcomes, from a mild 65°F afternoon to a classic foggy June morning that never climbs past 58°F. San Francisco’s marine layer can suppress afternoon temperatures sharply, and a strong onshore flow on June 1 would invalidate the leading outcome regardless of what the rest of the Bay Area experiences.

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Momentum and Market Signals

The momentum composite here is modest but directional. The trend score of 52.07 sits just above neutral, and the market jumped roughly 20% from its open price on May 30 before pulling back 7% the same day. The net result is a market that has moved decisively toward the 68°F-or-higher outcome since opening, then found some resistance. No price change registered in the last hour, suggesting traders are waiting for updated forecast data before adding more conviction.

Total volume stands at $2,380, with all of it generated in the last 24 hours. Liquidity sits at $57,001, which is unusually deep relative to the traded volume. That gap means the order book can absorb significant new positions without major price movement, but it also means the current price reflects a relatively thin base of actual trading decisions. Volume this far below $1M means a single informed trader with a fresh weather model could move this contract sharply in either direction.

• The 1-hour price change is flat at 0.0%, suggesting the market has paused ahead of the next forecast update.
• The 24-hour net movement is strongly positive, with the market climbing from $0.51 to $0.65 since opening.
• Trend score of 52.07 reflects mild bullish lean, not strong conviction.
• Liquidity of $57,001 against $2,380 in volume signals a very lightly traded but deep book.
• Any NWS forecast update showing warming or cooling for the June 1 Bay Area will likely reprice this immediately.

Lines Analysis: What the San Francisco Data Actually Says

The case for 68°F or higher rests on the meteorological pattern that occasionally breaks San Francisco’s fog cycle in early June. When a high-pressure ridge builds over the interior West, it pushes the marine layer offshore and allows afternoon temperatures in the city to climb into the upper 60s or low 70s. San Francisco’s historical June 1 highs span a wide range, but readings at or above 68°F are not unusual when synoptic-scale conditions favor warming. The market’s 65% probability reflects a scenario where that ridge materializes or is already forecast to arrive.

What makes the NO outcome real is the marine layer, full stop. San Francisco’s June Gloom pattern is strongest in late May and early June. A persistent low-pressure trough along the California coast, combined with cool Pacific sea surface temperatures, can hold the city’s high below 65°F even on days when inland areas hit 90°F. The National Weather Service’s Bay Area forecast, particularly the marine layer depth and onshore flow timing, is the single most important input here. If the June 1 forecast shows a strong onshore gradient, the 68°F threshold becomes very difficult to reach.

• A National Weather Service forecast showing a Diablo wind pattern or offshore flow for June 1 would push YES probability sharply higher.
• A forecast showing deep marine layer intrusion or persistent stratus on June 1 would strengthen the NO bracket significantly.
• Any update to the NOAA Climate Prediction Center’s short-range outlook for Northern California carries direct relevance.
• Sea surface temperature anomalies in the Pacific just west of San Francisco influence marine layer strength and should be monitored.
• Afternoon model runs (GFS, NAM, ECMWF) for the June 1 Bay Area period are the sharpest signal available before resolution.

The data doesn’t care about the politics, and here the data is genuinely uncertain. Total volume of $2,380 means this market is not reflecting deep crowd wisdom yet. The 65% probability is the market’s best current read, but it is based on thin trading. A weather model update in the next 24-48 hours carries more weight than anything currently priced in.

Leaning Yes, But the Fog Has a Vote

The market has tilted toward 68°F or higher based on early forecasts, but San Francisco’s early June marine layer is a genuine adversary. The meteorological setup, not trader sentiment, will determine this outcome.

What the market says: A 65% implied probability says traders think the warm scenario is more likely than not, but with volume this thin and the resolution date just two days away, this price is highly sensitive to any new forecast data. Expect sharp movement as June 1 approaches.

Key unknown: The National Weather Service’s Bay Area forecast for June 1, specifically marine layer depth and afternoon onshore flow strength, is the single data point that will reprice this contract. The next model cycle matters more than anything currently in the order book.

Scientific Context: San Francisco Temperature Climatology

San Francisco sits at the intersection of cold Pacific upwelling and California’s interior heat engine. Early June is historically when the marine layer is most persistent, a pattern climatologists call June Gloom. Daily highs in the city during early June typically range from the upper 50s to the low 70s, with the distribution skewed toward the cooler end. The 68°F threshold in this contract represents the upper portion of the normal range, not an extreme outlier. Markets pricing a 65% probability on this outcome are implicitly forecasting a warmer-than-median day for early June San Francisco. That is plausible, but the base rate of fog suppression on any given June 1 is not decisively in the warm camp.

What would move the price before June 1: Any NWS special weather statement, updated forecast discussion, or model consensus shift toward offshore flow would push YES higher. A marine layer advisory or coastal fog forecast for the Bay Area on June 1 would do the opposite. Here’s what the measurements are telling us: this is a market pricing uncertainty, not settled science, and the atmosphere has two days left to make its case.