5-day weather forecast Reykjavík Sep 20, 2026

10° · Patchy rain possible

Weather forecast Reykjavík Sunday Sep 20, 2026: patchy rain possible, temperature from 9 °C to 10 °C.

Precipitation probability 47%. Wind up to 9.11 m/s (gusts 12.81 m/s). Air humidity 64–88%, atmospheric pressure 750–761 mm Hg, UV index up to 1.3.

Sunrise 07:05
Sunset 19:36
Waxing Gibbous73% illuminated
Moonrise 19:53 · Moonset 22:52
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Table

Forecast from 9 °C to 10 °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)10101010109999999999999999999
Precipitation (mm/hr)0.150.130.220.270.090.180.140.040.0300.020.020.020.020.020000.0100000

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 (%)10092931009999625295717778817576100100100100100100999737
Rain chance (%)393641473743301822131516171615171616171718192011

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)5.895.896.117.197.819.118.897.816.114.393.392.52.312.312.392.6921.610.51.613.614.814.615.31
Wind gust (m/s)6.316.927.118.118.619.619.0312.8111.114.423.9232.922.812.813.252.532.221.222.925.426.616.818.5
Wind direction (°)W 265°WSW 254°WSW 251°W 260°WNW 282°WNW 284°W 279°W 269°W 267°W 275°W 259°WSW 242°SW 219°SW 215°SW 219°SW 226°SW 231°SW 221°SSE 165°SSE 147°SE 128°SE 134°ESE 117°E 100°

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 (%)858485878788868174706969707068666564646669717477

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)750751752752753755755757758758758759760760760761761761761761761761760759

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 Index0000000000.20.40.711.31.31.10.70.40.200000

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)1.91.41.61.51.41.61.91.922.22.32.22.121.91.71.61.51.61.92.22.44.66.6
PM10 (µg/m³)3.43.73.944.24.35.76.57.67.176.865.75.45.45.65.96.26.56.46.38.611.2
Ozone (O₃) (µg/m³)5555555657565861626365666667676768686866646263.365
NO₂ (µg/m³)1.61.41.41.41.41.21.10.90.80.60.60.60.60.70.70.70.91.11.63.53.12.51.91.5
SO₂ (µg/m³)0.70.70.70.80.70.60.50.40.50.40.50.50.50.61.51.92.12.62.11.41.14.610.111.6
CO (µg/m³)181183187186185186186185187184183184184185186188189191195201201199181.8161.5

Reykjavík 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.