San Jose · September
Run in the morning.
Comfortable average high of 83°F, dipping to 60°F at night. Dry month — only 3 measurable rain days on average. Comfortable conditions all day, but morning consistently delivers the best combination of cool air and clear skies.
Avg high / low
83° / 60°F
Humidity
60%
Rain days
3/mo
Wind
11 mph
What September feels like in San Jose
Sunrise
06:50
Mid-month average
Sunset
19:14
Mid-month average
Time-of-day breakdown
Morning
Steady cool air, low wind, and good light. The standard runner window in most months.
Midday
Mild but UV and traffic peak. Workable if you don't mind shifting your pace.
Evening
Warm and runnable. Crowded routes but the air's typically calm.
What to wear running in San Jose in September
The kit for September in San Jose: shorts and a short-sleeve are the standard kit.
September vs the surrounding months
vs August
-1° avg high
+2 rain days
San Jose in August →
September
83°F avg high
3 rain days
Best: morning
vs October
+6° avg high
-2 rain days
San Jose in October →
Frequently Asked Questions
What is the best time of day to run in San Jose in September?+
Morning. Comfortable conditions all day, but morning consistently delivers the best combination of cool air and clear skies.
What's the average temperature in San Jose in September?+
Average high 83°F, average low 60°F.
How does September compare to surrounding months in San Jose?+
Compared to August (avg high 84°F), September is cooler. Compared to October (avg high 77°F), September is warmer.
Does it rain often in San Jose in September?+
Expect about 3 measurable rain days in September, on average.