5-day weather forecast Reykjavík 18-04-2026

Weather forecast Reykjavík today 18.04.2026: sunny, temperature from 2 °C to 4 °C.

Precipitation probability 79%. Wind up to 9.69 m/s (gusts 12.83 m/s). Air humidity 50–94%, atmospheric pressure 755–762 mm Hg, UV index up to 2.1.

Sunrise 05:46
Sunset 21:11

Waxing Crescent1% illuminated
Moonrise 05:08 · Moonset below the horizon

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Sat, Apr 18, 2026

Sun, Apr 19 →

Forecast from 2 °C to 4 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	4	4	4	4	2	2	3	3	3	4	4	4	4	4	4	4	4	4	4	4	4	3	3	3
Precipitation (mm/hr)	0.03	0.01	0.01	0.1	0.21	0.13	0.03	0.01	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	68	72	76	71	100	100	100	100	92	75	69	32	48	24	14	10	9	10	6	4	5	6	7	11
Rain chance (%)	79	89	61	100	100	100	69	78	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	4	2.61	2.61	4.89	9.69	8.5	6.61	5.19	4.5	5	5.19	4.89	4.19	4.19	3.61	3.31	2.39	1.89	0.81	0.81	1.61	1.89	3	3.89
Wind gust (m/s)	5.42	3.75	3.92	7	12.83	10.72	8.58	6.75	5.83	6.42	6.58	6	5.08	5.11	4.33	3.97	2.97	2.39	1.03	1.06	2.17	2.75	4.42	5.83
Wind direction (°)	WSW 254°	WSW 248°	W 259°	W 270°	WNW 296°	WNW 290°	WNW 294°	WNW 300°	NW 307°	NW 311°	NW 312°	NW 313°	NW 316°	NW 311°	NW 311°	WNW 303°	NW 307°	WNW 297°	NW 308°	ESE 123°	SSE 158°	SE 142°	SE 130°	SE 124°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	77	73	71	77	94	84	70	63	58	52	52	51	51	52	52	52	51	51	50	51	53	57	60	63

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	755	755	755	756	757	758	758	758	759	760	760	761	761	761	761	761	761	761	761	761	761	762	762	762

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0.1	0.3	0.6	1	1.5	1.9	2.1	2.1	1.9	1.5	1	0.6	0.3	0.1	0	0	0

Air quality & pollen

Air quality
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
PM2.5 (µg/m³)	2.7	2.7	3.3	3.8	3.6	3.8	3.8	3.9	4.2	4.4	4.5	4.5	4.5	4.6	4.5	4.5	5.4	4.6	4.7	5.2	5.5	4.9	5	5.4
PM10 (µg/m³)	5.6	5.5	6.4	7.6	7.8	9.9	11.3	11.2	11.2	11.3	11.2	11.1	11	11	11	10.9	10.9	10.9	11.1	11.4	11.4	10.9	10.7	10.6
Ozone (O₃) (µg/m³)	81	81	81	90	99	103	103	104	104	104	103	103	101	99	98	95	93	91	87	81	79	78	79	80
NO₂ (µg/m³)	3.6	3.1	3.2	2.7	2.1	1.8	1.7	1.8	1.8	1.6	1.6	1.7	1.8	2	2.2	2.3	2.5	3.1	4.5	5.9	5.9	5.5	5	4.3
SO₂ (µg/m³)	3.7	2.4	1.9	1.8	1.4	1.2	1.1	1.1	1.2	1.3	1.3	1.4	1.4	1.4	1.5	1.5	1.6	1.8	2.9	4.2	4.5	3.7	6.5	23.3
CO (µg/m³)	158.9	160.9	161.9	163.9	156.9	158.9	156.9	155.9	153.9	150.9	150.9	151.9	151.9	152.9	152.9	153.9	155.9	158.9	165.9	178.9	187.9	181.9	174.9	183.9

Sat, Apr 18, 2026

Sun, Apr 19 →

Frequently asked questions about the weather in Reykjavík

Today in Reykjavík the temperature ranges from 2 °C to 4 °C, wind up to 9.69 m/s. Check the detailed hourly forecast above for more information.

The precipitation probability in Reykjavík today is 79%. View the full multi-day forecast above to see the rain chances for each upcoming day.

The wind speed in Reykjavík today reaches up to 9.69 m/s with gusts up to 12.83 m/s. Check the detailed wind chart above for hourly wind data.

The air humidity in Reykjavík today ranges from 50% to 94%. View the humidity chart above for hourly details.

The UV index in Reykjavík today reaches up to 2.1. Check the UV index chart above for hourly values throughout the day.

The atmospheric pressure in Reykjavík today ranges from 755 to 762 mm Hg. View the pressure chart above for hourly readings.

Cloud cover in Reykjavík today reaches up to 100%. Check the cloud cover chart above for hourly details throughout the day.

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.

Learn more about our methodology →