San Francisco (KSFO) Temperature Market Guide

KSFO • San Francisco International Airport

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San Francisco International Airport (KSFO) offers a ForecastEx temperature market with one of the most unique climates in the United States. SFO experiences remarkably stable, cool temperatures driven by marine influence.

Quick Facts

Station Code	`KSFO`
Location	San Francisco, CA
Coordinates	37.6213°N, 122.3790°W
Elevation	13 ft (4 m)
Timezone	PT (America/Los_Angeles)
NWS Office	San Francisco Bay Area (MTR)
Resolution Source	NWS CLI Report ↗

About the KSFO Weather Station

The KSFO ASOS is located at San Francisco International Airport on the western shore of San Francisco Bay, approximately 13 miles south of downtown. At just 13 feet elevation, the airport sits on filled bay land.

San Francisco Climate & Temperature Patterns

San Francisco experiences a Mediterranean climate (Koppen: Csb) with mild, wet winters and cool, dry summers.

Key Climate Factors:

Marine Layer: Cool, moist air from the Pacific keeps temperatures remarkably stable and cool.

Bay vs. Ocean: SFO's bay-side position is slightly warmer than the ocean side.

Microclimates: The Bay Area is famous for dramatic microclimate variation.

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Seasonal Trading Considerations

Winter (December - February):
Mild with average highs in the mid-50s°F. Pacific storms bring rain.

Spring (March - May):
Gradual warming with marine layer influence variable.

Summer (June - August):
Counterintuitively cool with average highs in the mid-60s°F. "June Gloom" is common.

Fall (September - November):
Often the warmest season as the marine layer weakens.

San Francisco-Specific Trading Tips

Marine Layer Depth: The depth and persistence of the marine layer determines daily temperatures.

Offshore Wind Events: When winds blow offshore, temperatures can spike 20-30°F above normal.

Fall is Warmest: September and October often bring the year's highest temperatures.

Extreme Stability: Days above 80°F are rare.

Market Resolution Details

San Francisco temperature markets resolve based on the official high temperature in the NWS CLI for station KSFO, issued by the San Francisco Bay Area forecast office (MTR).

Resolution Source: NWS CLI (Climatological Report)

Reporting Period: 12:00 AM to 11:59 PM Pacific Standard Time.

Data Release Schedule

Typical release times for key data products at KSFO. Times shown in UTC.

Data Type	Typical Time (UTC)	Variability
CLI Report Daily climatological summary	08:25 UTC	±5 min
24hr High METAR with max temp	07:56 UTC	±1 min
METAR Hourly observations	Hourly at :56	±1 min
DSM #1 Daily summary message	12:17 UTC	Issuance time
DSM #2 Daily summary message	00:17 UTC	Issuance time
DSM #3 Daily summary message	12:17 UTC	Issuance time
DSM #4 Daily summary message	00:19 UTC	Issuance time

6-Hour High/Low Reports

These METARs include 6-hour maximum and minimum temperatures, useful for tracking intraday temperature trends.

05:56 UTC

11:56 UTC

17:56 UTC

23:56 UTC

Note: Times are approximate and may vary. CLI reports are the official resolution source for temperature markets. See NWS Data Guide for more information.

Data Resources

Quick links to official data sources and tools for San Francisco.

📊 NWS Data

🗄️ Iowa Environmental Mesonet

📈 Wethr.net Tools

Forecasting Challenges

Marine Layer Prediction: Forecasting the depth and clearing time of the marine layer is notoriously difficult.

Microclimates: Forecasts for "San Francisco" may not apply to SFO specifically.

Historical Temperature Records

Record High: 106°F recorded in June 2000.

Record Low: 27°F recorded in December 1932.

Stable Climate: SFO has reached 90°F only a handful of times in recorded history.

📡 Official Data Sources

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