| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 15.1° | 8.9° | 112.8mm | 12 | 60 |
| February | 16.3° | 9.4° | 71.6mm | 9 | 70 |
| March | 18.6° | 11.1° | 79.9mm | 9.3 | 77 |
| April | 20.2° | 12.4° | 67.2mm | 9.6 | 81 |
| May | 22.9° | 14.5° | 49.8mm | 6.6 | 87 |
| June | 25.9° | 17° | 13.7mm | 2.8 | 94 |
| July | 27.8° | 18.3° | 2.5mm | 1.3 | 94 |
| August | 28.4° | 18.9° | 6.9mm | 1.7 | 91 |
| September | 26.3° | 17.8° | 36.8mm | 5.3 | 89 |
| October | 23° | 15.7° | 111.3mm | 10 | 80 |
| November | 18° | 11.9° | 139.5mm | 12 | 70 |
| December | 15.3° | 9.6° | 116.4mm | 11.8 | 61 |
January in Lisbon averages a daily high of 15.1°C with nights around 8.9°C. Expect roughly 12 wet days totalling 112.8mm. Generally workable, with some weather to plan around.
February in Lisbon averages a daily high of 16.3°C with nights around 9.4°C. Expect roughly 9 wet days totalling 71.6mm. Generally workable, with some weather to plan around.
March in Lisbon averages a daily high of 18.6°C with nights around 11.1°C. Expect roughly 9.3 wet days totalling 79.9mm. Comfortable conditions for being outdoors all day.
April in Lisbon averages a daily high of 20.2°C with nights around 12.4°C. Expect roughly 9.6 wet days totalling 67.2mm. Comfortable conditions for being outdoors all day.
May in Lisbon averages a daily high of 22.9°C with nights around 14.5°C. Expect roughly 6.6 wet days totalling 49.8mm. Comfortable conditions for being outdoors all day.
June in Lisbon averages a daily high of 25.9°C with nights around 17°C. Rain is rare — about 2.8 wet days and 13.7mm across the month. Comfortable conditions for being outdoors all day.
July in Lisbon averages a daily high of 27.8°C with nights around 18.3°C. Rain is rare — about 1.3 wet days and 2.5mm across the month. Comfortable conditions for being outdoors all day.
August in Lisbon averages a daily high of 28.4°C with nights around 18.9°C. Rain is rare — about 1.7 wet days and 6.9mm across the month. Comfortable conditions for being outdoors all day.
September in Lisbon averages a daily high of 26.3°C with nights around 17.8°C. Expect roughly 5.3 wet days totalling 36.8mm. Comfortable conditions for being outdoors all day.
October in Lisbon averages a daily high of 23°C with nights around 15.7°C. Expect roughly 10 wet days totalling 111.3mm. Comfortable conditions for being outdoors all day.
November in Lisbon averages a daily high of 18°C with nights around 11.9°C. Expect roughly 12 wet days totalling 139.5mm. Generally workable, with some weather to plan around.
December in Lisbon averages a daily high of 15.3°C with nights around 9.6°C. Expect roughly 11.8 wet days totalling 116.4mm. Generally workable, with some weather to plan around.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. Lisbon peaks at 94.
Based on 30 years of records, May–September scores highest for comfort in Lisbon, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 28.4°C.
November is the wettest, averaging 139.5mm of rain across roughly 12 wet days.
January is the coolest month, with average daily highs around 15.1°C.