Is September a good month to visit Lisbon?

Yes, with caveats. Comfortable temperatures, smaller crowds than peak summer. Sea around 19°C — bracing entry, fine once you're in.

Can you swim in Lisbon in September?

Sea is around 18.5°C — local-only territory in September.

What's the average rainfall in Lisbon in September?

About 23 mm on the 1991-2020 baseline — dry.

Is September crowded in Lisbon?

Manageable — September is shoulder season in Lisbon. Most venues open without the high-summer queues. Sweet spot for many travellers.

Lisbon · September 2026

Lisbon weather in September 2026

Comfortable summer-shoulder weather — Lisbon averages a 24.6°C high in September. Largely dry. Sea 18.5°C — brisk but doable.

Avg high

24.6°C

Avg low

18°C

Rainfall

23 mm

Dry

Sun

0 h/day

Sea temp

18.5°C

Brisk but doable

What to wear

Daytime is t-shirt-and-shorts; evenings warrant a jumper or a light jacket near the water. Sun-block on the strong end of the spectrum — UV is still high under haze.

What’s open in September

Year-round spots plus seasonal venues whose own season covers September. Tap through for the editorial detail page.

Common questions

Is September a good month to visit Lisbon?: Yes, with caveats. Comfortable temperatures, smaller crowds than peak summer. Sea around 19°C — bracing entry, fine once you're in.
Can you swim in Lisbon in September?: Sea is around 18.5°C — local-only territory in September.
What's the average rainfall in Lisbon in September?: About 23 mm on the 1991-2020 baseline — dry.
Is September crowded in Lisbon?: Manageable — September is shoulder season in Lisbon. Most venues open without the high-summer queues. Sweet spot for many travellers.