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The temperatures in Lisbon in August are comfortable with low of 17°C and and high up to 29°C.
There shouldn't be any rainy days in in Lisbon during August. Having said that, the days are very hot in August so hanging out outside is more recomanded during the after noons and evening time.
Our weather forecast can give you a great sense of what weather to expect in Lisbon in August 2025.
If you’re planning to visit Lisbon in the near future, we highly recommend that you review the 14 day weather forecast for Lisbon before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 15° / 9° | 5 | 26 | 0 | 76 mm | Good | Lisbon in January |
| February | 16° / 9° | 4 | 24 | 0 | 83 mm | Good | Lisbon in February |
| March | 18° / 10° | 5 | 26 | 0 | 88 mm | Good | Lisbon in March |
| April | 19° / 12° | 4 | 26 | 0 | 81 mm | Good | Lisbon in April |
| May | 23° / 14° | 3 | 28 | 0 | 53 mm | Perfect | Lisbon in May |
| June | 25° / 16° | 1 | 29 | 0 | 16 mm | Perfect | Lisbon in June |
| July | 28° / 17° | 0 | 31 | 0 | 4 mm | Perfect | Lisbon in July |
| August | 29° / 17° | 0 | 31 | 0 | 4 mm | Good | Lisbon in August |
| September | 27° / 17° | 2 | 28 | 0 | 38 mm | Perfect | Lisbon in September |
| October | 24° / 16° | 3 | 28 | 0 | 94 mm | Perfect | Lisbon in October |
| November | 18° / 12° | 6 | 24 | 0 | 109 mm | Good | Lisbon in November |
| December | 16° / 10° | 4 | 27 | 0 | 99 mm | Good | Lisbon in December |