Lisbon, PORTUGAL and its best beaches
Climate - Temperatures and rainfall - Atlantic Ocean
Lisbon: Temperatures during the day, at night, rain and bathing conditions
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Portugal : climate and when to go to Lisbon
Fresh and rainy temperate maritime climate to the north, hotter and drier in the south (104°F in summer). The Atlantic Ocean brings softness and moisture to Portugal all year round. In summer, the temperature of the water is on average 70°F in the Algarve on the Atlantic Ocean.
January Avoid |
February Avoid |
March Avoid |
April Avoid |
May Avoid |
June Avoid |
July Fine |
August Pecfect |
September Fine |
October Avoid |
November Avoid |
December Avoid |
When to go? The hottest month for the beach, lazing around and swimming is August. Check the precipitations because showers are possible but the sun returns quickly, otherwise other periods are possible. The coolest month is January, if you can not stand the heat too much. The driest month of the year is July, if you do not like the rain at all.
Click on
Faro -
Porto -
Lisbon -
The Azores to display its climate.
Graphs and temperature curves with average precipitation over the year


Precipitation, rainfall, cyclone: PORTUGAL

Temperatures of bathing water around Lisbon

Landmarks







No cyclone risk for this country


Atlantic Ocean
Climate September 2025
Lisbon sunshine in summer and winter



The sun at its zenith, that means well perpendicular to the surface of the Earth, sending 100% of radiation and heat. Lisbon receives in winter (january), 46% of sun power and 96% during summer time (july).
The average temperature and sunshine deviations between summer and winter are 50%. This large gap means that the temperature at sea varies and that it can be cooler during the winter. A sweater can be nice in the early morning or evening, the fell night in cooler season.

Average temperatures and rainfall for a stay in September
On the left, the averages observed every month of September on the Portugal beaches. The trends for next month are, slightly lower average daytime temperatures, a bathing water in Atlantic Ocean which loses degrees, more abundant rains with cooler nights.
Sunset and sunrise times for PORTUGAL
Local time : September 2025, Wednesday 17, 11:28 PM
Sunrise time : 06:24 am, point A
Sunset time : 6:36 pm, point B
Duration of daylight : 12:12 / 24:00
Jet lag : GMT+0

The average monthly UV index of PORTUGAL
What is the period of mosquitoes virulence over the year?
Weather forecast for Lisbon
Here are the current 5-day forecasts for Chiado / Lisbon. Temperatures are spaced 3 hours apart for each day. The summary of the state of the sky gives the trend of the week. The sea temperature at is a monthly average. In lagoons or seashores where the bathing water is shallow, you can add some degrees.
Friday
September 19, 2025
8 am
70.4°F
22°C

Scattered clouds
Humidity 57%
Sea 70°F/21°C
Friday
September 19, 2025
11 am
75°F
24°C

Overcast clouds
Humidity 54%
Sea 70°F/21°C
Friday
September 19, 2025
2 pm
79.3°F
27°C

Overcast clouds
Humidity 46%
Sea 70°F/21°C
Friday
September 19, 2025
5 pm
76.5°F
25°C

Overcast clouds
Humidity 58%
Sea 70°F/21°C
Friday
September 19, 2025
8 pm
75.2°F
24°C

Light rain
Humidity 61%
Sea 70°F/21°C
Friday
September 19, 2025
11 pm
71.6°F
22°C

Broken clouds
Humidity 77%
Sea 70°F/21°C
Saturday
September 20, 2025
8 am
68.9°F
21°C

Overcast clouds
Humidity 78%
Sea 70°F/21°C
Saturday
September 20, 2025
11 am
71.9°F
23°C

Overcast clouds
Humidity 62%
Sea 70°F/21°C
Saturday
September 20, 2025
2 pm
77.3°F
26°C

Overcast clouds
Humidity 44%
Sea 70°F/21°C
Saturday
September 20, 2025
5 pm
79.2°F
27°C

Overcast clouds
Humidity 41%
Sea 70°F/21°C
Saturday
September 20, 2025
8 pm
71.9°F
23°C

Scattered clouds
Humidity 67%
Sea 70°F/21°C
Saturday
September 20, 2025
11 pm
66.2°F
19°C

Clear sky
Humidity 73%
Sea 70°F/21°C
Sunday
September 21, 2025
8 am
61.5°F
17°C

Clear sky
Humidity 73%
Sea 70°F/21°C
Sunday
September 21, 2025
11 am
66.1°F
19°C

Clear sky
Humidity 57%
Sea 70°F/21°C
Sunday
September 21, 2025
2 pm
71°F
22°C

Clear sky
Humidity 46%
Sea 70°F/21°C
Sunday
September 21, 2025
5 pm
70.2°F
22°C

Clear sky
Humidity 50%
Sea 70°F/21°C
Sunday
September 21, 2025
8 pm
66.4°F
20°C

Clear sky
Humidity 55%
Sea 70°F/21°C
Sunday
September 21, 2025
11 pm
63.5°F
18°C

Clear sky
Humidity 65%
Sea 70°F/21°C
Monday
September 22, 2025
8 am
59.6°F
16°C

Scattered clouds
Humidity 62%
Sea 70°F/21°C
Monday
September 22, 2025
11 am
63.6°F
18°C

Broken clouds
Humidity 45%
Sea 70°F/21°C
Monday
September 22, 2025
2 pm
69°F
21°C

Scattered clouds
Humidity 44%
Sea 70°F/21°C
Monday
September 22, 2025
5 pm
69.2°F
21°C

Few clouds
Humidity 46%
Sea 70°F/21°C
Monday
September 22, 2025
8 pm
64.7°F
19°C

Few clouds
Humidity 57%
Sea 70°F/21°C
Monday
September 22, 2025
11 pm
61.1°F
17°C

Clear sky
Humidity 62%
Sea 70°F/21°C
Weather uncertainties 2025 to go to Lisbon ?


When traveling in the tropics as a seaside, rain is not welcome. If you see this indicator, with possible storms, that does not mean that it will rain all day long. When we observe the local rainfall, it is either really zero or very weak. Meteorologists prefer to be pessimistic. So observe below, the skies photographed during a week announced stormy in Asia. It did not rain once. I invite you to integrate this parameter before going to Lisbon for a good trip to the sun!



