Keflavik weather in August

In August, Keflavik sees average daytime highs of 12°C and overnight lows near 10°C, with 97 mm of rain across 14.2 wet days and about 16 hours of daylight. It is the 2nd-warmest and 8th-wettest month of the year here.

Day-to-day highs hold fairly steady near 12°C through the month. The sky is clear or mostly clear about 14% of the time in August, and the air most often feels dry.

Daylight stretches from about 17 h 42 min at the start of August to 14 h 24 min by month's end. Set against the rest of the year, August is Keflavik's 6th-clearest and 10th-windiest month. For the whole year in context, see Keflavik's year-round climate.

Daytime high: 12°; 2nd warmest
Overnight low: 10°; 11th coldest
Rainfall: 97 mm; 14.2 wet days
Daylight: 16 h 06 min; 5:33 AM – 9:36 PM
Cloud cover: 76%; 6th clearest
Wind: 19 km/h; 10th windiest
Solar energy: 3.61 kWh/m²
Travel score: 2.8; out of 10

Keflavik is town in Iceland.

Founded: 1501

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← July Keflavik year-round climate September →Best places to visit in August

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 12°C through the month.

A typical August day in Keflavik reaches about 12°C in the afternoon and slips back to 10°C overnight — a 3°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 14°C. Set against its neighbours, August runs on par with July and about 2°C warmer than September.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	13	13	13	13	13	13	13	13	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	11	11
Avg low (°C)	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	10	9	9	9	9	9	9	9	9	9	9	9	9	9

	Avg high (°C)	Avg low (°C)
1	13	10
2	13	10
3	13	10
4	13	10
5	13	10
6	13	10
7	13	10
8	13	10
9	12	10
10	12	10
11	12	10
12	12	10
13	12	10
14	12	10
15	12	10
16	12	10
17	12	10
18	12	10
19	12	9
20	12	9
21	12	9
22	12	9
23	12	9
24	12	9
25	12	9
26	12	9
27	12	9
28	12	9
29	12	9
30	11	9
31	11	9

How August really feels in Keflavik

Once humidity and wind are folded in, August averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Keflavik weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 8th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	3° / 0°	125	18.8	9.7	5	0.0
Feb	3° / -0°	123	17.4	10.4	8	0.0
Mar	4° / 0°	113	17.6	9.3	11.2	0.0
Apr	6° / 2°	91	15.4	3.4	14.6	0.3
May	8° / 5°	79	13.9	0.5	17.8	1.2
Jun	11° / 8°	67	12.8	0	20.1	2.3
Jul	12° / 10°	74	12.8	0	19.1	3.0
Aug	12° / 10°	97	14.2	0	16	2.8
Sep	10° / 7°	134	17.2	0	12.7	1.8
Oct	7° / 4°	120	15.4	1.6	9.3	0.8
Nov	5° / 2°	124	17.2	4.9	6.1	0.0
Dec	4° / 1°	129	18.6	9.1	3.9	0.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 14% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 12% of August, with mostly cloudy or overcast conditions the remaining 74%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	25	25	25	24	24	24	25	25	26	26	26	26	26	29	29	28	29	29	29	28	28	27	26	26	26	24	24	24	23	23	23
Cloudier (%)	75	75	75	76	76	76	75	75	74	74	74	74	74	71	71	72	71	71	71	72	72	73	74	74	74	76	76	76	77	77	77

	Clearer (%)	Cloudier (%)
1	25	75
2	25	75
3	25	75
4	24	76
5	24	76
6	24	76
7	25	75
8	25	75
9	26	74
10	26	74
11	26	74
12	26	74
13	26	74
14	29	71
15	29	71
16	28	72
17	29	71
18	29	71
19	29	71
20	28	72
21	28	72
22	27	73
23	26	74
24	26	74
25	26	74
26	24	76
27	24	76
28	24	76
29	23	77
30	23	77
31	23	77

Chance of precipitation in August

Any precipitation

Keflavik gets around 97 mm of rain over 14.2 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 46% and peaks near 55% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	41	41	41	41	41	42	42	42	42	42	43	43	44	44	44	45	46	46	47	47	48	49	49	50	51	52	53	54	54	55	55

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	42
7	42
8	42
9	42
10	42
11	43
12	43
13	44
14	44
15	44
16	45
17	46
18	46
19	47
20	47
21	48
22	49
23	49
24	50
25	51
26	52
27	53
28	54
29	54
30	55
31	55

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	99	99	99	99	99	99	99	99	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	0	0	0	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

Wind in August

Winds average 19 km/h in August.

Across August, daily wind ranges from about 17 km/h on the calmest days to 21 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	17	17	17	18	18	18	18	18	18	18	18	18	18	18	18	18	19	19	19	19	19	19	19	19	20	20	20	20	21	21	21
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	breezy	breezy	breezy	breezy	breezy

	Wind speed (km/h)	Feels
1	17	light breeze
2	17	light breeze
3	17	light breeze
4	18	light breeze
5	18	light breeze
6	18	light breeze
7	18	light breeze
8	18	light breeze
9	18	light breeze
10	18	light breeze
11	18	light breeze
12	18	light breeze
13	18	light breeze
14	18	light breeze
15	18	light breeze
16	18	light breeze
17	19	light breeze
18	19	light breeze
19	19	light breeze
20	19	light breeze
21	19	light breeze
22	19	light breeze
23	19	light breeze
24	19	light breeze
25	20	light breeze
26	20	light breeze
27	20	breezy
28	20	breezy
29	21	breezy
30	21	breezy
31	21	breezy

Sunrise & sunset in August

DaylightNight

Daylight runs from about 17 h 42 min at the start of August to 14 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 198 minutes over August. Sunrise moves from 4:46 AM to 6:18 AM, and sunset from 10:26 PM to 8:42 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	17.7	17.6	17.5	17.3	17.2	17.1	17.0	16.9	16.8	16.7	16.6	16.5	16.4	16.3	16.2	16.1	15.9	15.8	15.7	15.6	15.5	15.4	15.3	15.2	15.1	15.0	14.8	14.7	14.6	14.5	14.4
Sunrise (AM)	4:46	4:49	4:53	4:56	4:59	5:02	5:05	5:08	5:11	5:14	5:17	5:20	5:24	5:27	5:30	5:33	5:36	5:39	5:42	5:45	5:48	5:51	5:54	5:57	6:00	6:03	6:06	6:09	6:12	6:15	6:18
Sunset (PM)	10:26	10:23	10:20	10:17	10:13	10:10	10:07	10:03	10:00	9:57	9:53	9:50	9:46	9:43	9:39	9:36	9:32	9:29	9:25	9:22	9:18	9:15	9:11	9:08	9:04	9:00	8:57	8:53	8:50	8:46	8:42

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	17.7	4:46	10:26
2	17.6	4:49	10:23
3	17.5	4:53	10:20
4	17.3	4:56	10:17
5	17.2	4:59	10:13
6	17.1	5:02	10:10
7	17.0	5:05	10:07
8	16.9	5:08	10:03
9	16.8	5:11	10:00
10	16.7	5:14	9:57
11	16.6	5:17	9:53
12	16.5	5:20	9:50
13	16.4	5:24	9:46
14	16.3	5:27	9:43
15	16.2	5:30	9:39
16	16.1	5:33	9:36
17	15.9	5:36	9:32
18	15.8	5:39	9:29
19	15.7	5:42	9:25
20	15.6	5:45	9:22
21	15.5	5:48	9:18
22	15.4	5:51	9:15
23	15.3	5:54	9:11
24	15.2	5:57	9:08
25	15.1	6:00	9:04
26	15.0	6:03	9:00
27	14.8	6:06	8:57
28	14.7	6:09	8:53
29	14.6	6:12	8:50
30	14.5	6:15	8:46
31	14.4	6:18	8:42

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.61 kWh/m².

For context, solar energy here swings from a low near 0.05 kWh/m² to a high of 5.38 kWh/m² in June across the year — August's 3.61 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	4.3	4.3	4.2	4.2	4.1	4.1	4.0	4.0	4.0	3.9	3.9	3.8	3.8	3.8	3.7	3.7	3.6	3.6	3.5	3.5	3.4	3.4	3.3	3.2	3.2	3.1	3.0	3.0	2.9	2.9	2.8
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	4.3	Bright
2	4.3	Bright
3	4.2	Bright
4	4.2	Bright
5	4.1	Bright
6	4.1	Bright
7	4.0	Bright
8	4.0	Moderate
9	4.0	Moderate
10	3.9	Moderate
11	3.9	Moderate
12	3.8	Moderate
13	3.8	Moderate
14	3.8	Moderate
15	3.7	Moderate
16	3.7	Moderate
17	3.6	Moderate
18	3.6	Moderate
19	3.5	Moderate
20	3.5	Moderate
21	3.4	Moderate
22	3.4	Moderate
23	3.3	Moderate
24	3.2	Moderate
25	3.2	Moderate
26	3.1	Moderate
27	3.0	Moderate
28	3.0	Moderate
29	2.9	Moderate
30	2.9	Moderate
31	2.8	Moderate

Planning a trip in August

Is August a good time to visit Keflavik?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

2.8

Sightseeing

2nd-best month of the year

—

Beach & pool

never really warm enough

August is a weaker month for outdoor sightseeing in Keflavik.

What to pack for Keflavik in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Keflavik sees daytime highs around 12°C and nights near 10°C. Pack rain gear. Worth having: a warm layer. About 14 days see rain.

rain geara warm layer

Sea temperature near Keflavik in August

The nearest coast averages about 11°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 14 km away) is warmest in August at about 11°C and coldest in March near 5°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	6	5	5	6	7	9	11	11	10	8	7	6
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°C)	Comfort
Jan	6	Bracing
Feb	5	Bracing
Mar	5	Bracing
Apr	6	Bracing
May	7	Bracing
Jun	9	Bracing
Jul	11	Bracing
Aug	11	Bracing
Sep	10	Bracing
Oct	8	Bracing
Nov	7	Bracing
Dec	6	Bracing

UV index in Keflavik in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 3. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Keflavik peaks around June 21 at about 4 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 3 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	0	1	2	3	5	4	3	2	1	0	0
Level	Low	Low	Low	Moderate	Moderate	Moderate	Moderate	Moderate	Low	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	0	Low
Mar	1	Low
Apr	2	Moderate
May	3	Moderate
Jun	5	Moderate
Jul	4	Moderate
Aug	3	Moderate
Sep	2	Low
Oct	1	Low
Nov	0	Low
Dec	0	Low

Location & terrain

Where is Keflavik?

Keflavik sits at 64.0°N, 22.6°W, 5 m above sea level, in Iceland. The nearest listed city is Reykjanesbær, 1.0 km away.

Topography around Keflavik

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Keflavik.

Within 3 km, the terrain around Keflavik has only modest variations in elevation — a maximum elevation change of 60 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 187 m; within 80 km, large variations in elevation — a maximum elevation change of 1,065 m.

The land around Keflavik is covered by grassland (45%) and water (37%) within 3 km, water (57%) and grassland (36%) within 16 km, and water (67%) and grassland (28%) within 80 km.

3 km

60 m

grassland 45%

16 km

187 m

water 57%

80 km

1,065 m

water 67%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwaterwetlandmoss and lichen

← July Keflavik year-round climate September →Best places to visit in August

August weather nearby: Reykjanesbær 1.0 km · Hafnarfjörður 31 km · Kópavogur 34 km · Reykjavik 36 km · Vik 187 km · Akureyri 282 km · Tórshavn 825 km · Isle of Lewis 1,076 km

Iceland travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 118% of US; price level, 2025
GDP per capita: $98,323; 2025
Happiness: 7.5 / 10; World Happiness, 2025
Safe drinking water: 100%; of population, 2024
Homicide rate: 1.3; per 100k, 2023
Road deaths: 2; per 100k/yr, 2019
Income group: High; World Bank
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Keflavik (64.0049°, -22.5624°, elevation 5 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	13	10
2	13	10
3	13	10
4	13	10
5	13	10
6	13	10
7	13	10
8	13	10
9	12	10
10	12	10
11	12	10
12	12	10
13	12	10
14	12	10
15	12	10
16	12	10
17	12	10
18	12	10
19	12	9
20	12	9
21	12	9
22	12	9
23	12	9
24	12	9
25	12	9
26	12	9
27	12	9
28	12	9
29	12	9
30	11	9
31	11	9

	Clearer (%)	Cloudier (%)
1	25	75
2	25	75
3	25	75
4	24	76
5	24	76
6	24	76
7	25	75
8	25	75
9	26	74
10	26	74
11	26	74
12	26	74
13	26	74
14	29	71
15	29	71
16	28	72
17	29	71
18	29	71
19	29	71
20	28	72
21	28	72
22	27	73
23	26	74
24	26	74
25	26	74
26	24	76
27	24	76
28	24	76
29	23	77
30	23	77
31	23	77

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	42
7	42
8	42
9	42
10	42
11	43
12	43
13	44
14	44
15	44
16	45
17	46
18	46
19	47
20	47
21	48
22	49
23	49
24	50
25	51
26	52
27	53
28	54
29	54
30	55
31	55

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°C)	Avg low (°C)
1	13	10
2	13	10
3	13	10
4	13	10
5	13	10
6	13	10
7	13	10
8	13	10
9	12	10
10	12	10
11	12	10
12	12	10
13	12	10
14	12	10
15	12	10
16	12	10
17	12	10
18	12	10
19	12	9
20	12	9
21	12	9
22	12	9
23	12	9
24	12	9
25	12	9
26	12	9
27	12	9
28	12	9
29	12	9
30	11	9
31	11	9

	Clearer (%)	Cloudier (%)
1	25	75
2	25	75
3	25	75
4	24	76
5	24	76
6	24	76
7	25	75
8	25	75
9	26	74
10	26	74
11	26	74
12	26	74
13	26	74
14	29	71
15	29	71
16	28	72
17	29	71
18	29	71
19	29	71
20	28	72
21	28	72
22	27	73
23	26	74
24	26	74
25	26	74
26	24	76
27	24	76
28	24	76
29	23	77
30	23	77
31	23	77

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	42
7	42
8	42
9	42
10	42
11	43
12	43
13	44
14	44
15	44
16	45
17	46
18	46
19	47
20	47
21	48
22	49
23	49
24	50
25	51
26	52
27	53
28	54
29	54
30	55
31	55

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0

	Avg high (°C)	Avg low (°C)
1	13	10
2	13	10
3	13	10
4	13	10
5	13	10
6	13	10
7	13	10
8	13	10
9	12	10
10	12	10
11	12	10
12	12	10
13	12	10
14	12	10
15	12	10
16	12	10
17	12	10
18	12	10
19	12	9
20	12	9
21	12	9
22	12	9
23	12	9
24	12	9
25	12	9
26	12	9
27	12	9
28	12	9
29	12	9
30	11	9
31	11	9

	Clearer (%)	Cloudier (%)
1	25	75
2	25	75
3	25	75
4	24	76
5	24	76
6	24	76
7	25	75
8	25	75
9	26	74
10	26	74
11	26	74
12	26	74
13	26	74
14	29	71
15	29	71
16	28	72
17	29	71
18	29	71
19	29	71
20	28	72
21	28	72
22	27	73
23	26	74
24	26	74
25	26	74
26	24	76
27	24	76
28	24	76
29	23	77
30	23	77
31	23	77

	Rain chance (%)
1	41
2	41
3	41
4	41
5	41
6	42
7	42
8	42
9	42
10	42
11	43
12	43
13	44
14	44
15	44
16	45
17	46
18	46
19	47
20	47
21	48
22	49
23	49
24	50
25	51
26	52
27	53
28	54
29	54
30	55
31	55

	Dry (%)	Comfortable (%)
1	100	0
2	100	0
3	100	0
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	99	1
17	99	1
18	99	1
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0
31	100	0