Honolulu · September
Run in the morning.
Comfortable average high of 84°F, dipping to 76°F at night. Expect 17 rain days — plan around the radar. Humidity rises with the sun — morning runs catch the driest, coolest window.
Avg high / low
84° / 76°F
Humidity
73%
Rain days
17/mo
Wind
14 mph
What September feels like in Honolulu
Sunrise
06:18
Mid-month average
Sunset
18:33
Mid-month average
Time-of-day breakdown
Morning
Coolest, driest air of the day. The window before sunrise is the most reliable comfortable hour.
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 Honolulu in September
The kit for September in Honolulu: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
September vs the surrounding months
vs August
0° avg high
+3 rain days
Honolulu in August →
September
84°F avg high
17 rain days
Best: morning
vs October
+2° avg high
0 rain days
Honolulu in October →
Frequently Asked Questions
What is the best time of day to run in Honolulu in September?+
Morning. Humidity rises with the sun — morning runs catch the driest, coolest window.
What's the average temperature in Honolulu in September?+
Average high 84°F, average low 76°F.
How does September compare to surrounding months in Honolulu?+
Compared to August (avg high 84°F), September is cooler. Compared to October (avg high 83°F), September is warmer.
Does it rain often in Honolulu in September?+
Expect about 17 measurable rain days in September, on average.