Lisbon
April to June and October.
April, May, June and October give the best mix of weather and space. Daytime highs stay between 20 and 26 degrees, and rain days fall from about eight in April to two in June. July, August and September are the busiest and hottest, with the most queues at Belém and the castle. From November to March days are cooler and wetter, but the sights are quiet and the light is good.
Data checked on October 4, 2026
| Month | High | Low | Rainy days | Verdict |
|---|---|---|---|---|
| January | 15.1 °C | 8.6 °C | 10 | · |
| February | 16.4 °C | 9.1 °C | 7.9 | · |
| March | 18.9 °C | 11 °C | 7.6 | · |
| April | 20.4 °C | 12.3 °C | 7.9 | Best |
| May | 23.1 °C | 14.4 °C | 5.8 | Best |
| June | 26.1 °C | 16.8 °C | 2 | Best |
| July | 28.2 °C | 18.2 °C | 0.6 | Busy |
| August | 28.8 °C | 18.8 °C | 1.1 | Busy |
| September | 26.6 °C | 17.6 °C | 3.8 | Busy |
| October | 22.8 °C | 15.3 °C | 8.7 | Best |
| November | 18.1 °C | 11.8 °C | 9.9 | · |
| December | 15.4 °C | 9.4 °C | 10 | · |
Climate averages: Instituto Português do Mar e da Atmosfera.
13 to 21 °C · about 7 rainy days a month
Highs reach about 19 degrees in March and 23 in May. Rain falls on 6 to 8 days a month, and it is often short. Crowds build through the season.
What to wear: Pack layers, a light waterproof jacket and shoes with grip for wet cobbles.
18 to 28 °C · about 1 rainy days a month
July and August average a high near 28 degrees, with very little rain and many dry, sunny days. The old centre fills with visitors, and the hills feel hotter than the thermometer says.
What to wear: Wear light cotton, a hat and sunscreen, and carry a refillable bottle.
15 to 23 °C · about 7 rainy days a month
September is still warm, around 27 degrees, and rain returns in October and November, to about 9 to 10 days a month. The queues thin out in October.
What to wear: Pack a mix of light layers and a rain jacket, plus shoes that dry fast.
9 to 16 °C · about 9 rainy days a month
Highs sit around 15 or 16 degrees and lows near 9, and December and January have about 10 days of rain each. The city rarely gets cold, but wet days are common, and queues are short.
What to wear: Bring a warm jacket, a waterproof layer and shoes with a non-slip sole.
Rain makes the cobbled lanes of Alfama and Bairro Alto slippery, and trams run slowly. Indoor choices still fill a day well: the Gulbenkian Museum, the Oceanário, the Jerónimos Monastery, the National Pantheon and the cathedral. Time Out Market works for a long lunch, and the Carmo ruins are half open to the sky, so keep them for a dry break.
On summer afternoons the castle, Praça do Comércio and the Belém waterfront have almost no shade. In an average August the high passes 30 degrees on about 10 days, so start outdoor sights early. Spend the hottest hours, roughly 13:00 to 17:00, in a museum or a long lunch, then return to the viewpoints in the evening.