5-day weather forecast Lisbon Sep 18, 2026

28°17° · Partly cloudy

Weather forecast Lisbon tomorrow Sep 18, 2026: partly cloudy, temperature from 17 °C to 28 °C.

Precipitation probability 24%. Wind up to 6.19 m/s (gusts 13.72 m/s). Air humidity 32–81%, atmospheric pressure 761–762 mm Hg, UV index up to 6.5.

Sunrise 07:20
Sunset 19:40
First Quarter53% illuminated
Moonrise 15:16 · Moonset does not set today
Chart
Table

Forecast from 17 °C to 28 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)191818181717171717192124262728272625232220202020
Precipitation (mm/hr)000000000000000000000000

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)100843475781006670441005652057626432314165445
Rain chance (%)1816101820241718131871245523434444

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)5.395.3154.614.694.193.693.3933.694.193.893.113.614.555.8966.116.1954.113.312.61
Wind gust (m/s)13.7213.0611.9211.2211.4210.510.119.618.817.616.535.393.723.648.5810.89117.728.819.3397.56.5
Wind direction (°)N 356°N 355°N 355°N 352°N 352°N 351°N 355°N 357°N 357°N 359°N 358°N 2°N 349°NNW 338°NNW 330°NW 325°NW 324°NNW 327°NNW 331°NNW 331°NNW 333°NNW 345°NNW 344°NNW 342°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)697176788181818180705744353232333742495362616061

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)762761761761761761761761761761762762761761761761761761761761761761761761

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index0000000000.61.83.65.46.46.55.74.12.20.90.20000

Air quality & pollen

Air quality
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
PM2.5 (µg/m³)6.97.47.47.376.86.76.97.47.77.77.98.17.98.27.87.47.27.27.476.46.76.7
PM10 (µg/m³)12.913.213.212.912.411.511.511.812.312.612.612.914.314.213.81311.811.211.411.411.110.810.811.2
Ozone (O₃) (µg/m³)757372706865626159555457677781838688898477777575
NO₂ (µg/m³)5.55.14.34.13.845.46.29.111.910.810.210.410.410.4108.98.11011.513.512.712.111.3
SO₂ (µg/m³)110.90.9111.11.11.21.31.51.71.81.91.91.81.71.71.71.81.61.41.41.5
CO (µg/m³)170169165164163163163167168174177181181182181177176174176183186182181181

Lisbon on the map

Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.