Grimstad weather in August

In August, Grimstad sees average daytime highs of 20°C and overnight lows near 14°C, with 101 mm of rain across 12 wet days and about 15.1 hours of daylight. It is the 2nd-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 18°C by the end. The sky is clear or mostly clear about 31% of the time in August, and the air most often feels dry.

Daylight stretches from about 16 h 18 min at the start of August to 13 h 54 min by month's end. Set against the rest of the year, August is Grimstad's 4th-clearest and 11th-windiest month. For the whole year in context, see Grimstad's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
14°
11th coldest
Rainfall
101 mm
12 wet days
Daylight
15 h 06 min
4:55 AM – 8:04 PM
Cloud cover
58%
4th clearest
Wind
15 km/h
11th windiest
Solar energy
4.45 kWh/m²
Travel score
6.0
out of 10

Grimstad is settlement in Grimstad Municipality, Norway.

Density
2,552/km²
people per km²
Founded
1816

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 21°C in the first days to 18°C by the end.

A typical August day in Grimstad reaches about 20°C in the afternoon and slips back to 14°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 23°C. Set against its neighbours, August runs on par with July and about 4°C warmer than September.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
12114
22114
32114
42114
52014
62014
72014
82014
92014
102014
112014
122014
132014
142014
152014
162014
172014
182014
191913
201913
211913
221913
231913
241913
251913
261913
271813
281813
291812
301812
311812

How August really feels in Grimstad

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
0
heat index over the day's high
Days feeling ≤ C
0
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.

Grimstad weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 6th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -0°10714.47.66.80.0
Feb / -1°7911.478.90.0
Mar / 7110.14.811.40.4
Apr10° / 589.91.3142.1
May14° / 6310016.44.2
Jun18° / 11°759.5017.85.8
Jul20° / 14°729.7017.26.4
Aug20° / 14°10112015.16.0
Sep16° / 11°10512.4012.54.6
Oct11° / 11914.10.39.92.5
Nov / 11514.82.47.50.8
Dec / 104144.26.20.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 17% of August, with mostly cloudy or overcast conditions the remaining 52%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25149
35149
45050
55050
64951
74951
84951
94852
104753
114852
124753
134852
144852
154852
164951
174951
184951
195050
204951
215050
224951
234852
244852
254753
264753
274753
284654
294654
304654
314456

Chance of precipitation in August

Any precipitation

Grimstad gets around 101 mm of rain over 12 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 38% and peaks near 41% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
135
235
335
436
536
637
737
837
937
1037
1137
1237
1337
1437
1538
1638
1738
1838
1939
2039
2139
2240
2340
2440
2540
2640
2740
2841
2941
3041
3141

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 59% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
1503911
2503911
3503911
4503911
5513910
6513910
7513910
853389
953389
1053389
1153389
1255378
1355378
1455378
1556368
1656368
1757358
1858348
1958348
2060337
2161327
2263307
2364297
2466286
2567276
2670255
2771245
2873234
2974224
3074224
3176213

Wind in August

Winds average 15 km/h in August.

Across August, daily wind ranges from about 15 km/h on the calmest days to 16 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
115light breeze
215light breeze
315light breeze
415light breeze
515light breeze
615light breeze
715light breeze
815light breeze
915light breeze
1015light breeze
1115light breeze
1215light breeze
1315light breeze
1415light breeze
1515light breeze
1615light breeze
1715light breeze
1816light breeze
1916light breeze
2016light breeze
2116light breeze
2216light breeze
2316light breeze
2416light breeze
2516light breeze
2616light breeze
2716light breeze
2816light breeze
2916light breeze
3016light breeze
3116light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 16 h 18 min at the start of August to 13 h 54 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 144 minutes over August. Sunrise moves from 4:23 AM to 5:29 AM, and sunset from 8:41 PM to 7:22 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.34:238:41
216.24:258:39
316.24:278:36
416.14:298:34
516.04:318:32
615.94:338:29
715.94:358:27
815.84:388:24
915.74:408:22
1015.64:428:20
1115.54:448:17
1215.54:468:14
1315.44:498:12
1415.34:518:09
1515.24:538:07
1615.14:558:04
1715.14:588:01
1815.05:007:59
1914.95:027:56
2014.85:047:53
2114.75:077:51
2214.65:097:48
2314.65:117:45
2414.55:137:42
2514.45:167:39
2614.35:187:37
2714.25:207:34
2814.15:227:31
2914.15:257:28
3014.05:277:25
3113.95:297:22

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.45 kWh/m².

For context, solar energy here swings from a low near 0.28 kWh/m² to a high of 6.12 kWh/m² in June across the year — August's 4.45 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.2Bright
25.1Bright
35.1Bright
45.0Bright
55.0Bright
65.0Bright
74.9Bright
84.9Bright
94.8Bright
104.8Bright
114.7Bright
124.7Bright
134.6Bright
144.6Bright
154.5Bright
164.5Bright
174.5Bright
184.4Bright
194.3Bright
204.3Bright
214.2Bright
224.2Bright
234.1Bright
244.0Bright
254.0Moderate
263.9Moderate
273.9Moderate
283.8Moderate
293.7Moderate
303.6Moderate
313.6Moderate
Planning a trip in August

Is August a good time to visit Grimstad?

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

6.0
Sightseeing
2nd-best month of the year
2.9
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Grimstad for sightseeing.

What to pack for Grimstad in August

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

In August, Grimstad sees daytime highs around 20°C and nights near 14°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Grimstad in August

The nearest coast averages about 18°C in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 18°C and coldest in February near 4°C.

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

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan5Bracing
Feb4Bracing
Mar4Bracing
Apr6Bracing
May10Bracing
Jun15Bracing
Jul17Cool
Aug18Cool
Sep15Cool
Oct12Bracing
Nov9Bracing
Dec7Bracing

UV index in Grimstad in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Grimstad peaks around August 10 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 20 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowAug 10UV 5Dec 20UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May5Moderate
Jun4Moderate
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low
Location & terrain

Where is Grimstad?

Grimstad sits at 58.3°N, 8.6°E, 9 m above sea level, in Norway. The nearest listed city is Arendal, 17 km away.

Topography around Grimstad

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

Within 3 km, the terrain around Grimstad has only modest variations in elevation — a maximum elevation change of 124 m around an average of 29 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 340 m; within 80 km, large variations in elevation — a maximum elevation change of 930 m.

The land around Grimstad is covered by trees (39%) and water (30%) within 3 km, water (51%) and trees (40%) within 16 km, and trees (56%) and water (37%) within 80 km.

3 km
124 m
16 km
340 m
80 km
930 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Arendal 17 km · Kristiansand 41 km · Porsgrunn 108 km · Skien 113 km · Larvik 115 km · Hjørring 127 km · Sandefjord 128 km · Skagen 136 km

Norway travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 91% of US
price level, 2025
GDP per capita
$94,594
2025
Happiness
7.2 / 10
World Happiness, 2025
Safe drinking water
99%
of population, 2024
Homicide rate
0.7
per 100k, 2023
Road deaths
2.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 613
Religion
Church of Norway 68%other Christian 4%Muslim 3%Roman Catholic 3%

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 Grimstad (58.3405°, 8.5934°, elevation 9 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).