Karhula weather in August

In August, Karhula sees average daytime highs of 20°C and overnight lows near 13°C, with 66 mm of rain across 11.6 wet days and about 15.4 hours of daylight. It is the 2nd-warmest and 1st-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 21% of the time in August, and the air most often feels dry.

Daylight stretches from about 16 h 48 min at the start of August to 14 h 06 min by month's end. Set against the rest of the year, August is Karhula's 4th-clearest and 9th-windiest month. For the whole year in context, see Karhula's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
13°
11th coldest
Rainfall
66 mm
11.6 wet days
Daylight
15 h 30 min
4:33 AM – 8:00 PM
Cloud cover
65%
4th clearest
Wind
13 km/h
9th windiest
Solar energy
4.09 kWh/m²
Travel score
5.9
out of 10

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 Karhula reaches about 20°C in the afternoon and slips back to 13°C overnight — a 7°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 24°C. Set against its neighbours, August runs about 1°C cooler than July and about 5°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12114
22114
32114
42114
52114
62114
72114
82114
92114
102014
112014
122013
132013
142013
152013
162013
172013
181913
191913
201913
211913
221912
231912
241912
251812
261812
271812
281812
291812
301811
311711

How August really feels in Karhula

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.

Karhula 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° / -7°4710.910.96.30.0
Feb-3° / -8°429.29.28.60.0
Mar / -5°3797.211.30.0
Apr / 358.82.614.20.9
May13° / 439.50.116.93.7
Jun17° / 10°6411.1018.55.3
Jul21° / 14°5810.1017.86.4
Aug20° / 13°6611.6015.45.9
Sep15° / 5810.2012.64.2
Oct / 6411.619.71.3
Nov / -0°61125.170.0
Dec-0° / -4°5912.395.50.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 21% 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 62%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14852
24654
34555
44456
54357
64357
74258
84060
94060
104060
114060
124060
134060
144060
153961
163862
173763
183763
193664
203664
213565
223466
233466
243367
253367
263367
273268
283070
293070
303070
313070

Chance of precipitation in August

Any precipitation

Karhula gets around 66 mm of rain over 11.6 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 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
132
232
333
433
534
635
735
836
936
1037
1137
1238
1338
1438
1539
1639
1739
1839
1940
2040
2140
2239
2339
2439
2539
2638
2738
2837
2937
3037
3136

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 54% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14141154
24241143
34241143
44341143
54441133
64541132
74541122
84640122
94740111
104840111
114940111
125039101
135039101
14513991
15523891
16543880
17543880
18563770
19563770
20583660
21583660
22603550
23603550
24613450
25633340
26643240
27653140
28673030
29682930
30692830
31712630

Wind in August

Winds average 13 km/h in August.

Across August, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
113light breeze
213light breeze
313light breeze
413light breeze
513light breeze
613light breeze
713light breeze
813light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2814light breeze
2914light breeze
3014light breeze
3114light breeze

Sunrise & sunset in August

DaylightNight

Daylight runs from about 16 h 48 min at the start of August to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 162 minutes over August. Sunrise moves from 3:56 AM to 5:10 AM, and sunset from 8:41 PM to 7:14 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.83:568:41
216.73:588:38
316.64:018:36
416.54:038:33
516.44:068:31
616.34:088:28
716.24:108:25
816.24:138:23
916.14:158:20
1016.04:188:17
1115.94:208:14
1215.84:238:11
1315.74:258:09
1415.64:288:06
1515.54:308:03
1615.54:338:00
1715.44:357:57
1815.34:387:54
1915.24:407:51
2015.14:437:48
2115.04:457:45
2214.94:487:42
2314.84:507:39
2414.74:537:36
2514.64:557:33
2614.54:587:30
2714.45:007:27
2814.35:037:24
2914.25:057:20
3014.25:087:17
3114.15:107:14

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.09 kWh/m².

For context, solar energy here swings from a low near 0.14 kWh/m² to a high of 5.61 kWh/m² in June across the year — August's 4.09 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.8Bright
34.8Bright
44.8Bright
54.7Bright
64.6Bright
74.6Bright
84.5Bright
94.5Bright
104.4Bright
114.3Bright
124.3Bright
134.2Bright
144.2Bright
154.1Bright
164.1Bright
174.0Bright
184.0Moderate
193.9Moderate
203.9Moderate
213.8Moderate
223.7Moderate
233.7Moderate
243.6Moderate
253.6Moderate
263.5Moderate
273.5Moderate
283.4Moderate
293.3Moderate
303.3Moderate
313.2Moderate
Planning a trip in August

Is August a good time to visit Karhula?

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

5.9
Sightseeing
2nd-best month of the year
2.9
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Karhula for sightseeing.

What to pack for Karhula in August

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

In August, Karhula sees daytime highs around 20°C and nights near 13°C. Worth packing: rain gear. About 12 days see rain.

rain gear

Sea temperature near Karhula in August

The nearest coast averages about 17°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 17°C and coldest in February near 0°C.

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

0°10°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan1Bracing
Feb0Bracing
Mar0Bracing
Apr2Bracing
May6Bracing
Jun12Bracing
Jul17Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Karhula 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 Karhula peaks around June 20 at about 5 (high) — 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 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Karhula?

Karhula sits at 60.5°N, 26.9°E, 4 m above sea level, in Finland. The nearest listed city is Kotka, 6.0 km away.

OrimattilaLahtiMäntsälä

Topography around Karhula

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

Within 3 km, the terrain around Karhula has only modest variations in elevation — a maximum elevation change of 54 m around an average of 15 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 90 m; within 80 km, only modest variations in elevation — a maximum elevation change of 178 m.

The land around Karhula is covered by trees (60%) within 3 km, trees (49%) and water (33%) within 16 km, and water (47%) and trees (44%) within 80 km.

3 km
54 m
16 km
90 m
80 km
178 m
treesgrasslandcroplandartificial surfaceswaterwetland
August weather nearby: Kotka 6.0 km · Hamina 16 km · Anjala 19 km · Kouvola 40 km · Porvoo 71 km · Orimattila 73 km · Lahti 86 km · Mäntsälä 89 km

Finland travel facts

Travel advisory
Level 1
Exercise Normal Precautions
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 85% of US
price level, 2025
GDP per capita
$56,149
2025
Happiness
7.8 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1
per 100k, 2023
Road deaths
3.9
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 603
Religion
Lutheran 67%none 31%other 2%Greek Orthodox 1%

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 Karhula (60.5216°, 26.9312°, elevation 4 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).