Lisbon weather by month
Lisbon weather by month is Atlantic first: 15 °C by day in January, 28 °C in August, and an ocean that stays between 15 °C and 19 °C.
Lisbon in November, daytime high
18 °C
| Night low | 12 °C |
| Sea surface | 17 °C |
| Rain in the month | 127 mm |
| Days with 1 mm or more | 10 days |
| Daylight | 10 h 00 min |
| October, daytime high | 23 °C |
| December, daytime high | 15 °C |
Averages 1991 to 2020 at Lisboa Geofisica. A typical month, not a forecast. Method.
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Lisbon faces the open Atlantic, and the ocean sets the rhythm of its year far more than the Mediterranean sets the rhythm of Barcelona or Malaga. Our figures come from the Lisboa Geofísica station in the city, averaged over 1991 to 2020. Winters are mild and wet: 15 °C by day in January, 9 °C at night, and 107 mm of rain in December spread over about 10 days. The dry season is short but reliable, with 2 mm in July and 7 mm in August. Summer afternoons reach 28 °C in July, yet the evenings stay comfortable because the sea never gets warm, peaking at 19 °C in September. That makes Lisbon a better city break than a swimming holiday, and spring and early autumn its most pleasant seasons.
Lisbon weather by month in one table
| Month | Daytime high | Night low | Sea | Rain | Wet days | Daylight |
|---|---|---|---|---|---|---|
| January | 15 °C | 9 °C | 15 °C | 106 mm | 10 days | 9 h 42 min |
| February | 16 °C | 9 °C | 15 °C | 66 mm | 7 days | 10 h 42 min |
| March | 19 °C | 11 °C | 15 °C | 74 mm | 7 days | 11 h 48 min |
| April | 20 °C | 12 °C | 15 °C | 65 mm | 8 days | 13 h 12 min |
| May | 23 °C | 14 °C | 16 °C | 57 mm | 6 days | 14 h 18 min |
| June | 26 °C | 17 °C | 18 °C | 13 mm | 2 days | 14 h 54 min |
| July | 28 °C | 18 °C | 18 °C | 2 mm | 1 day | 14 h 36 min |
| August | 28 °C | 19 °C | 19 °C | 7 mm | 1 day | 13 h 42 min |
| September | 26 °C | 18 °C | 19 °C | 36 mm | 4 days | 12 h 24 min |
| October | 23 °C | 15 °C | 18 °C | 111 mm | 9 days | 11 h 06 min |
| November | 18 °C | 12 °C | 17 °C | 127 mm | 10 days | 10 h 00 min |
| December | 15 °C | 10 °C | 16 °C | 107 mm | 10 days | 9 h 30 min |
When it rains in Lisbon
Rain arrives with the autumn depressions off the Atlantic. October has 111 mm and November 127 mm, the wettest month of the year, and the wet season continues to March with 74 mm. Even then, wet days number about 10 days in November, so most days in a winter week are dry. From June to September the city sees 2 days, 1 day, 1 day and 4 days of rain a month.
Best months for a city break and for the beach
For walking the hills, May at 23 °C and October at 23 °C are hard to beat. A high of 25 °C or more is the rule from June to September. The beaches of Cascais and the Costa da Caparica are popular in summer, but the water there never reaches 20 °C on average. For warmer water within Portugal, look to Madeira, where the sea reaches 24 °C in September; for a hotter Iberian summer, Malaga adds a few degrees.