What September feels like in Bilbao
For Bilbao, September is early autumn on the calendar. Mild afternoons make it easy to spend hours outdoors. There is little difference between day and night: nights stay mild, and evenings feel much like the afternoon. Moist air is typical, yet it seldom feels heavy at this time of year.
Rain in Bilbao in September
It is a changeable month: rain comes about one day in 3, with dry spells in between. Each rainy day adds about 6 mm (0.2 in), a proper wetting rather than a sprinkle. Across the year Bilbao averages about 6.9 mm per rainy day, so September is typical. It is among the three driest months of the year.
Daylight and sunshine in September
On 15 September the sun rises at about 7:50 am and sets around 8:24 pm local time, giving 12 h 34 min of daylight. Compared with mid-August, the day has lost 1 h 26 min. The sun is out for roughly 78% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
In Bilbao's temperature order, September sits as the 3rd warmest month. Against August, the average high is 1.5°C (2.7°F) lower, with 17 mm more rain. The cooling trend carries on into October. October averages a high of 20.5°C (68.9°F).
Who September suits
- Sightseeing: a good fit — comfortable enough to explore on foot all day.
- Parks & outdoor: a good fit — pleasant for gardens, parks and riversides.
- Beach: less ideal — too many rainy days.
Tips for visiting Bilbao in September
Rain Protection
A packable rain jacket saves the day on showery afternoons.
Sunglasses
Bright days make sunglasses worth packing.
Quick questions
How warm is Bilbao in September?
Afternoons average 22.9°C (73.2°F) and nights about 15.6°C (60.1°F) — mild by most people's standards. It is the 3rd warmest month of the year.
Does it rain a lot in Bilbao in September?
Yes, fairly — rain falls about one day in 3 and totals about 66 mm, so an umbrella is worth carrying.
What should I wear in Bilbao in September?
The numbers point to rain protection and sunglasses. There is little need to change for the evening.
Is September or October better for visiting Bilbao?
September scores better on our climate ranking (#3 of 12 vs #5), rated Good against Good. October is cooler and has more rainy days.