Typical Run Score
92
Great
San Francisco · December
Running in San Francisco in December
Typical December running conditions in San Francisco, and a live Run Score so you can see how today compares with the norm.
Avg temperature
51°F
Ideal
Avg dew point
47°F
Comfortable
Best window
6 AM–11 PM
Local time
San Francisco · today vs the December normTemperature · dew point · wind · timing
How December compares in San Francisco
December ranks 1st of 12 months for running in San Francisco, with a typical daytime Run Score of 92 (Great). It's the best running month of the year here: temperatures around 51°F (11°C) and comfortable dew points. Precipitation falls in roughly 21% of hours this month. Use the live tool below to see how today actually compares with the December norm.
Running weather in nearby cities
Same engine, different climate. Check the best time to run in these cities too.
Running in San Francisco in December: FAQ
Is it good to run in San Francisco in December?
Yes, it's one of the better months to run here. The typical daytime Run Score is 92 (Great), with temperatures around 51°F (11°C) and comfortable dew points. The best window is usually 6 AM–11 PM.
How hot is it for running in San Francisco in December?
Typical temperatures average 51°F (11°C) (Ideal) with dew points near 47°F. Dew point (not the thermometer) usually decides how hard the run feels.
What is a good Run Score?
Scores run 0–100. 80–100 is Great (97+ earns a gold star for near-perfect conditions). 65–79 (Good) is solid. 45–64 (Fair) means at least one factor (usually heat or dew point) is slowing you. Below 45 (Poor), expect a noticeably harder effort or hold back for safety.
Why does dew point matter more than temperature?
Your body cools by evaporating sweat. When the dew point climbs above roughly 60°F, the air is too saturated for sweat to evaporate efficiently, so heat builds up even if the thermometer looks reasonable. That's why a 70°F muggy morning can feel harder than a dry 80°F afternoon.
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