Lisbon in September
In September, Lisbon averages 27°C (81°F) during the day and 17°C (63°F) at night, with around 5 days of rain (30 mm total).
High seasonConditions are warm and beach-friendly. Occasional showers are likely but won't dominate.
September is a great month to visit Lisbon: pleasant temperatures and relatively few wet days.
How September compares to the rest of the year in Lisbon
September is one of the warmest months in Lisbon (3rd of 12) and moderately rainy compared to the rest of the year (9th of 12). Daytime temperature runs 6°C above the annual average (21°C). September runs 2°C cooler than August (29°C) and cools 5°C in October (22°C).
September sunrise & sunset in Lisbon
Times shown for Lisbon local time (Europe/Lisbon), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Lisbon — September
Golden-hour and blue-hour windows for the 15th of September, in Lisbon's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Lisbon in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (High season) and Lisbon's popularity.
Crowds & pricing — September in Lisbon
This is a busy month in Lisbon — not the absolute peak, but tourist numbers are clearly elevated. You'll feel it at headline attractions on weekends and in the historic centre, though side streets and lesser-known sights stay manageable. Prices are above off-season but not at their summit. A good week for first-time visitors who want everything open without the worst of the crush.
Why this tier: excellent tourism weather
Sun & mosquito risk — September in Lisbon
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Lisbon — September
Across the year Lisbon's sea swings from 14.7°C (February) to 19.5°C (June) — September sits at 18.5°C.
Lisbon in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 15°C / 59°F | 8°C / 46°F | 110 mm | 11 | — |
| February | 16°C / 61°F | 8°C / 46°F | 75 mm | 9 | — |
| March | 18°C / 64°F | 10°C / 50°F | 55 mm | 9 | — |
| April | 19°C / 66°F | 11°C / 52°F | 65 mm | 9 | — |
| May | 22°C / 72°F | 13°C / 55°F | 45 mm | 6 | — |
| June | 26°C / 79°F | 16°C / 61°F | 20 mm | 3 | — |
| July | 28°C / 82°F | 17°C / 63°F | 5 mm | 1 | — |
| August | 29°C / 84°F | 18°C / 64°F | 6 mm | 1 | — |
| September | 27°C / 81°F | 17°C / 63°F | 30 mm | 5 | — |
| October | 22°C / 72°F | 14°C / 57°F | 85 mm | 9 | — |
| November | 18°C / 64°F | 11°C / 52°F | 110 mm | 11 | — |
| December | 15°C / 59°F | 9°C / 48°F | 110 mm | 12 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Lisbon in September →
Frequently asked questions
How hot is Lisbon in September?
In September, Lisbon averages a high of 27°C (81°F) and a low of 17°C (63°F) — generally warm.
Does it rain a lot in Lisbon in September?
September sees occasional rain in Lisbon, with about 5 rainy days on average.
Is September a good time to visit Lisbon?
September is warm and mostly dry. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Lisbon in September?
Pack lightweight, breathable clothing, sunglasses and sunscreen. See the full September packing list for Lisbon for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.