Sundsvall weather in August

In August, Sundsvall sees average daytime highs of 19°C and overnight lows near 10°C, with 75 mm of rain across 11.7 wet days and about 15.7 hours of daylight. It is the 2nd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 20°C in the first days to 17°C by the end. The sky is clear or mostly clear about 17% of the time in August, and the air most often feels dry.

Daylight stretches from about 17 h 12 min at the start of August to 14 h 12 min by month's end. Set against the rest of the year, August is Sundsvall's 8th-clearest and 11th-windiest month. For the whole year in context, see Sundsvall's year-round climate.

Daytime high
19°
2nd warmest
Overnight low
10°
11th coldest
Rainfall
75 mm
11.7 wet days
Daylight
15 h 48 min
4:02 AM – 7:47 PM
Cloud cover
68%
8th clearest
Wind
10 km/h
11th windiest
Solar energy
3.84 kWh/m²
Travel score
5.7
out of 10

Sundsvall is urban area in Sundsvall Municipality, Sweden.

Air quality
Good
PM2.5 5.8 µg/m³ · 2019
Founded
1621

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 20°C in the first days to 17°C by the end.

A typical August day in Sundsvall reaches about 19°C in the afternoon and slips back to 10°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 23°C. Set against its neighbours, August runs about 1°C cooler than July and about 5°C warmer than September.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12111
22111
32111
42011
52011
62011
72011
82011
92011
102011
112010
122010
131910
141910
151910
161910
171910
181910
191910
201810
21189
22189
23189
24189
25189
26189
27179
28179
29178
30178
31178

How August really feels in Sundsvall

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.

Sundsvall weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -9°489.89.65.60.0
Feb-2° / -9°347.88.48.30.0
Mar / -6°357.3711.30.0
Apr / -1°377.94.314.41.2
May13° / 449.80.617.33.6
Jun17° / 5810.6019.25.4
Jul20° / 11°7312.1018.55.9
Aug19° / 10°7511.7015.75.7
Sep14° / 559.6012.64.0
Oct / 6310.21.99.51.0
Nov / -3°5310.66.56.60.0
Dec-1° / -7°5010.58.94.70.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 17% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 18% of August, with mostly cloudy or overcast conditions the remaining 65%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13862
23862
33763
43763
53763
63664
73664
83664
93565
103664
113565
123565
133565
143565
153466
163466
173466
183466
193466
203367
213466
223367
233367
243268
253367
263367
273367
283367
293367
303367
313466

Chance of precipitation in August

Any precipitation

Sundsvall gets around 75 mm of rain over 11.7 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 38% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
138
238
338
438
538
637
737
837
937
1037
1137
1237
1337
1437
1537
1637
1737
1837
1937
2037
2138
2238
2338
2438
2538
2638
2737
2837
2936
3036
3135

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 77% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1643051
2652951
3652951
4662851
5672751
6692551
7702451
8712351
9732250
10732250
11742150
12762040
13771940
14771940
15791830
16791830
17801730
18801730
19821620
20821620
21821620
22821620
23821620
24841510
25841510
26851410
27861310
28861310
29871210
30881110
31891010

Wind in August

Winds average 10 km/h in August.

Across August, daily wind ranges from about 10 km/h on the calmest days to 11 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2311calm
2411calm
2511calm
2611calm
2711calm
2811calm
2911calm
3011calm
3111calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 17 h 12 min at the start of August to 14 h 12 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 180 minutes over August. Sunrise moves from 3:21 AM to 4:44 AM, and sunset from 8:33 PM to 6:58 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
117.23:218:33
217.13:238:30
317.03:268:27
416.93:298:24
516.83:328:21
616.73:348:18
716.63:378:15
816.53:408:12
916.43:438:09
1016.33:468:06
1116.23:488:03
1216.13:518:00
1316.13:547:57
1416.03:577:54
1515.93:597:51
1615.84:027:47
1715.74:057:44
1815.64:087:41
1915.54:117:38
2015.44:137:35
2115.34:167:31
2215.14:197:28
2315.04:227:25
2414.94:257:21
2514.84:277:18
2614.74:307:15
2714.64:337:11
2814.54:367:08
2914.44:387:05
3014.34:417:01
3114.24:446:58

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.84 kWh/m².

For context, solar energy here swings from a low near 0.1 kWh/m² to a high of 5.57 kWh/m² in June across the year — August's 3.84 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.5Bright
34.5Bright
44.4Bright
54.4Bright
64.4Bright
74.3Bright
84.3Bright
94.2Bright
104.2Bright
114.1Bright
124.1Bright
134.0Bright
144.0Moderate
153.9Moderate
163.9Moderate
173.8Moderate
183.8Moderate
193.7Moderate
203.7Moderate
213.6Moderate
223.5Moderate
233.5Moderate
243.4Moderate
253.4Moderate
263.3Moderate
273.3Moderate
283.2Moderate
293.2Moderate
303.1Moderate
313.1Moderate
Planning a trip in August

Is August a good time to visit Sundsvall?

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

5.7
Sightseeing
2nd-best month of the year
2.4
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Sundsvall for sightseeing.

What to pack for Sundsvall in August

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

In August, Sundsvall sees daytime highs around 19°C and nights near 10°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Sundsvall in August

The nearest coast averages about 16°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 17 km away) is warmest in August at about 16°C and coldest in February near 1°C.

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

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°C)Comfort
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May6Bracing
Jun10Bracing
Jul15Cool
Aug16Cool
Sep13Bracing
Oct9Bracing
Nov5Bracing
Dec3Bracing

UV index in Sundsvall in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Sundsvall peaks around June 18 at about 4 (moderate) — a little sun protection helps at midday. It bottoms out near December 17 at about 0 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJun 18UV 4Dec 17UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar1Low
Apr2Moderate
May4Moderate
Jun5Moderate
Jul4Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Sundsvall?

Sundsvall sits at 62.4°N, 17.3°E, 26 m above sea level, in Sweden. The nearest listed city is Härnösand, 42 km away.

ÖrnsköldsvikÖstersundGävleSandvikenFalunUmeå

Topography around Sundsvall

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

Within 3 km, the terrain around Sundsvall has only modest variations in elevation — a maximum elevation change of 241 m around an average of 70 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 343 m; within 80 km, significant variations in elevation — a maximum elevation change of 549 m.

The land around Sundsvall is covered by trees (54%) and artificial surfaces (29%) within 3 km, trees (61%) and water (23%) within 16 km, and trees (66%) and water (28%) within 80 km.

3 km
241 m
16 km
343 m
80 km
549 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Härnösand 42 km · Hudiksvall 75 km · Örnsköldsvik 123 km · Östersund 162 km · Gävle 191 km · Sandviken 199 km · Falun 218 km · Umeå 218 km

Sweden travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 87% of US
price level, 2025
GDP per capita
$63,133
2025
Happiness
7.3 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
3.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 609
Religion
Church of Sweden 54%none or unspecified 37%other 9%

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 Sundsvall (62.3913°, 17.3063°, elevation 26 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).