Dublin · September
Run in the morning.
Cool month: average high 63°F, low 53°F. Humidity averages 81% — the limiting factor on most runs. Expect 17 rain days — plan around the radar. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
Avg high / low
63° / 53°F
Humidity
81%
Rain days
17/mo
Wind
14 mph
What September feels like in Dublin
Sunrise
06:59
Mid-month average
Sunset
19:39
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 Dublin in September
The kit for September in Dublin: shorts and a short-sleeve are the standard kit, a water-resistant cap or jacket on standby.
September vs the surrounding months
vs August
-3° avg high
-3 rain days
Dublin in August →
September
63°F avg high
17 rain days
Best: morning
vs October
+5° avg high
-1 rain days
Dublin in October →
Frequently Asked Questions
What is the best time of day to run in Dublin in September?+
Morning. Cool, runnable conditions throughout — morning still has the steadiest air and lightest wind.
What's the average temperature in Dublin in September?+
Average high 63°F, average low 53°F.
How does September compare to surrounding months in Dublin?+
Compared to August (avg high 66°F), September is cooler. Compared to October (avg high 57°F), September is warmer.
Does it rain often in Dublin in September?+
Expect about 17 measurable rain days in September, on average.