Portugal climate

Monthly averages for Lisbon, 2021–2025

In Lisbon, the warmest month is August, with an average high of 29°C, and the coldest is January, when nights average 9°C.

About 673 mm of rain falls in a year, on roughly 83 days. December is the wettest month (110 mm) and August the driest (0 mm).

Wind is strongest in May (14 km/h on average) and lightest in November (12 km/h).

Compared with Dublin, July afternoons are 10°C warmer, and January afternoons 7°C milder.

The hottest day in 2021–2025 reached 40.7°C (29 June 2025), and the coldest night fell to 1.4°C (13 January 2021).

Temperature

Bars run from the average night-time low to the average daytime high, in °C.

Average total rainfall each month, in millimetres.

Average wind speed at 10 metres each month, in km/h.

Lisbon month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	15	9	78	8	7.5	13
February	17	10	77	9	8.0	12
March	18	10	84	12	9.3	13
April	20	12	59	9	11.0	12
May	23	14	18	3	12.5	14
June	26	17	22	5	13.2	13
July	29	18	3	1	13.3	13
August	29	18	0	0	12.4	13
September	26	17	48	6	10.8	12
October	24	16	91	10	8.6	12
November	19	12	83	10	7.6	12
December	16	10	110	11	7.3	12