Mäntsälä weather in August

In August, Mäntsälä sees average daytime highs of 20°C and overnight lows near 11°C, with 65 mm of rain across 11.3 wet days and about 15.5 hours of daylight. It is the 2nd-warmest and 3rd-wettest month of the year here.

Highs ease over the month, from about 22°C in the first days to 18°C by the end. The sky is clear or mostly clear about 16% 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 Mäntsälä's 5th-clearest and 11th-windiest month. For the whole year in context, see Mäntsälä's year-round climate.

Daytime high
20°
2nd warmest
Overnight low
11°
11th coldest
Rainfall
65 mm
11.3 wet days
Daylight
15 h 30 min
4:39 AM – 8:07 PM
Cloud cover
69%
5th clearest
Wind
10 km/h
11th windiest
Solar energy
3.89 kWh/m²
Travel score
6.0
out of 10

Mäntsälä is the administrative centre of the Mäntsälä municipality, Finland.

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 22°C in the first days to 18°C by the end.

A typical August day in Mäntsälä reaches about 20°C in the afternoon and slips back to 11°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 16°C and 25°C. Set against its neighbours, August runs about 1°C cooler than July and about 6°C warmer than September.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12213
22213
32212
42212
52212
62212
72212
82112
92112
102112
112112
122112
132111
142111
152011
162011
172011
182011
192011
202011
212011
221910
231910
241910
251910
261910
271910
281810
291810
30189
31189

How August really feels in Mäntsälä

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.

Mäntsälä weather by month

How August compares with the rest of the year at a glance. August is the 2nd-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-3° / -8°4310.210.56.20.0
Feb-3° / -9°368.48.78.50.0
Mar / -6°348.17.911.30.0
Apr / -0°358.8314.21.7
May15° / 479.80.216.94.7
Jun19° / 10°7312.2018.55.6
Jul22° / 12°7312.5017.96.1
Aug20° / 11°6511.3015.56.0
Sep15° / 5110.1012.64.2
Oct / 5511.11.49.71.1
Nov / -1°5110.55.470.0
Dec-1° / -5°4911.39.35.50.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 16% 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 67%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
13961
23862
33763
43763
53664
63565
73565
83664
93565
103466
113466
123565
133565
143466
153565
163565
173466
183466
193367
203367
213268
223169
233169
243070
253070
262971
272773
282773
292773
302674
312674

Chance of precipitation in August

Any precipitation

Mäntsälä gets around 65 mm of rain over 11.3 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 37% and peaks near 40% on the wettest days.

0%10%20%30%40%50%151015202531
Rain chance (%)
134
234
335
435
535
635
736
836
937
1037
1138
1238
1339
1439
1540
1640
1739
1839
1939
2039
2138
2238
2338
2437
2537
2636
2736
2836
2935
3035
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 68% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1563491
2573481
3573481
4593371
5593371
6613261
7613261
8623161
9633151
10643150
11663040
12663040
13672940
14672940
15682840
16692830
17692830
18702730
19702730
20712720
21712720
22712720
23722620
24722620
25732520
26752410
27762310
28772210
29782110
30792010
31801910

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
2310calm
2410calm
2510calm
2610calm
2710calm
2811calm
2911calm
3011calm
3111calm

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 4:02 AM to 5:17 AM, and sunset from 8:48 PM to 7:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.84:028:48
216.74:048:46
316.64:068:43
416.54:098:40
516.44:118:38
616.44:148:35
716.34:168:32
816.24:198:30
916.14:218:27
1016.04:248:24
1115.94:268:21
1215.84:298:18
1315.74:318:16
1415.64:348:13
1515.64:368:10
1615.54:398:07
1715.44:418:04
1815.34:448:01
1915.24:467:58
2015.14:497:55
2115.04:517:52
2214.94:547:49
2314.84:567:46
2414.74:597:43
2514.65:027:40
2614.55:047:37
2714.45:077:33
2814.45:097:30
2914.35:127:27
3014.25:147:24
3114.15:177:21

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 3.89 kWh/m².

For context, solar energy here swings from a low near 0.13 kWh/m² to a high of 5.37 kWh/m² in June across the year — August's 3.89 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.7Bright
24.6Bright
34.6Bright
44.5Bright
54.5Bright
64.4Bright
74.4Bright
84.3Bright
94.3Bright
104.2Bright
114.2Bright
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
293.1Moderate
303.1Moderate
313.0Moderate
Planning a trip in August

Is August a good time to visit Mäntsälä?

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
3.2
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Mäntsälä for sightseeing.

What to pack for Mäntsälä in August

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

In August, Mäntsälä sees daytime highs around 20°C and nights near 11°C. Worth packing: rain gear. About 11 days see rain.

rain gear

Sea temperature near Mäntsälä 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 57 km away) is warmest in August at about 17°C and coldest in March near 1°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
Jan2Bracing
Feb1Bracing
Mar1Bracing
Apr2Bracing
May6Bracing
Jun11Bracing
Jul16Cool
Aug17Cool
Sep15Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Mäntsälä 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 Mäntsälä peaks around June 18 at about 5 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateModerateLowJun 18UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug4Moderate
Sep2Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Mäntsälä?

Mäntsälä sits at 60.6°N, 25.3°E, 59 m above sea level, in Finland. The nearest listed city is Järvenpää, 22 km away.

Topography around Mäntsälä

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

Within 3 km, the terrain around Mäntsälä has only modest variations in elevation — a maximum elevation change of 48 m around an average of 81 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 106 m; within 80 km, only modest variations in elevation — a maximum elevation change of 226 m.

The land around Mäntsälä is covered by trees (58%) within 3 km, trees (68%) and cropland (20%) within 16 km, and trees (60%) and water (23%) within 80 km.

3 km
48 m
16 km
106 m
80 km
226 m
treesgrasslandcroplandartificial surfaceswater
August weather nearby: Järvenpää 22 km · Hyvinge 25 km · Kerava 28 km · Sibbo 29 km · Orimattila 29 km · Tuusula 30 km · Riihimäki 32 km · Porvoo 33 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 Mäntsälä (60.6333°, 25.3167°, elevation 59 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).