What is the best time to run in San Francisco?

The best time to run in San Francisco depends on current weather conditions, particularly dew point and temperature. Use ForeRun's real-time Running Score to find optimal windows. Generally, early morning before humidity peaks offers the best conditions, especially when training for the SF Marathon.

How does humidity affect running in San Francisco?

San Francisco's microclimates/fog significantly impacts running performance. When dew point exceeds 65°F, your body's cooling system is compromised, making runs feel 10-15% harder. The ForeRun Score accounts for these conditions to help you plan effectively.

How should I adjust my pace for San Francisco weather?

Use the dew point rule: for every 3°F above 55°F dew point, slow your pace by approximately 1%. In San Francisco conditions around The Embarcadero, this can mean slowing 5-12% on challenging days to maintain the same cardiovascular effort.

San Francisco, CA

Best Time to Run in San Francisco

Real-time San Francisco running forecast with heat-adjusted pace calculations for The Embarcadero and beyond.

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The San Francisco Runner's Guide to Weather

The Weather Trap

The Embarcadero at 9 AM: sunny, 62°F, perfect. The Embarcadero at 9:45 AM: fog bank rolled in, temp dropped 15 degrees, you're soaked and shivering. San Francisco's microclimates can change conditions block-by-block and minute-by-minute. Standard weather apps give you one number for a city that has dozens of weather zones.

The Real Effort

San Francisco's fog isn't just cold—it's wet cold that penetrates layers and saps body heat. Running through the fog zone, your muscles tighten, your pace slows, and that "easy" run becomes a fight against hypothermia. Meanwhile, runners on the sunny side of the hill are overheating. Same city, completely different challenges.

The ForeRun Solution

SF Marathon training means mastering the microclimates. ForeRun tracks fog patterns, temperature inversions, and wind corridors to find when and where conditions align for quality training. We'll show you when the Embarcadero is clear, when Golden Gate Park is fogged in, and when to adjust your route for the weather that's actually happening.

Dew Point Pace Adjustment Chart

For every 3°F increase in dew point above 55°F, expect approximately 1% slowing in your pace.

Dew Point	Impact	Pace Adjustment
55°F and below	Ideal / PB Conditions	0%
56°F to 62°F	Noticeable / Slightly Heavy	1–3% slower
63°F to 67°F	Tough / High Heart Rate	4–6% slower
68°F to 72°F	Oppressive / Dangerous	7–10% slower
73°F +	Extreme Risk / Redline	12%+ slower

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