Suomenlinna weather in July

In July, Suomenlinna sees average daytime highs of 22°C and overnight lows near 14°C, with 78 mm of rain across 12.1 wet days and about 17.7 hours of daylight. It is the 1st-warmest and 1st-wettest month of the year here.

Highs climb over the month, from about 20°C in the first days to 22°C by the end. The sky is clear or mostly clear about 25% of the time in July, and the air most often feels dry.

Daylight stretches from about 18 h 24 min at the start of July to 16 h 42 min by month's end. Set against the rest of the year, July is Suomenlinna's 2nd-clearest and 12th-windiest month. For the whole year in context, see Suomenlinna's year-round climate.

Daytime high
22°
1st warmest
Overnight low
14°
12th coldest
Rainfall
78 mm
12.1 wet days
Daylight
17 h 48 min
3:32 AM – 9:20 PM
Cloud cover
60%
2nd clearest
Wind
12 km/h
12th windiest
Solar energy
5.58 kWh/m²
Travel score
6.3
out of 10

Temperature in July

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 20°C in the first days to 22°C by the end.

A typical July day in Suomenlinna reaches about 22°C in the afternoon and slips back to 14°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 17°C and 27°C. Set against its neighbours, July runs about 3°C warmer than June and about 1°C warmer than August.

10°15°20°25°30°151015202531
Avg high (°C)Avg low (°C)
12012
22013
32013
42113
52113
62113
72113
82113
92113
102113
112113
122113
132114
142214
152214
162214
172214
182214
192214
202214
212214
222214
232214
242214
252214
262214
272214
282214
292214
302214
312214

How July really feels in Suomenlinna

Once humidity and wind are folded in, July 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

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

Suomenlinna weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-2° / -7°4710.910.16.40.0
Feb-3° / -8°429.58.68.60.0
Mar / -5°368.4711.30.0
Apr / 378.52.314.21.4
May14° / 469.30.116.84.3
Jun19° / 11°7411.8018.45.6
Jul22° / 14°7812.1017.76.3
Aug20° / 13°7412015.46.0
Sep15° / 5810.5012.64.4
Oct / 6011.40.79.71.5
Nov / 5811.64.47.10.0
Dec / -4°5612.18.85.60.0

Cloud cover in July

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 25% of the time in July.

Beyond those clear spells, partly cloudy skies cover about 23% of July, with mostly cloudy or overcast conditions the remaining 52%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14555
24654
34654
44555
54654
64654
74753
84852
94753
104753
114852
124852
134852
144852
154852
164852
174951
184951
195050
204951
214951
224951
234951
245050
255050
265050
275050
284951
294951
304951
314951

Chance of precipitation in July

Any precipitation

Suomenlinna gets around 78 mm of rain over 12.1 wet days in July, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 39% and peaks near 43% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
143
243
343
442
542
641
741
841
941
1040
1140
1240
1340
1439
1539
1639
1739
1838
1938
2038
2137
2237
2337
2437
2537
2636
2736
2836
2936
3036
3136

Humidity in July

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, July lands in the dry band about 49% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1712450
2702550
3672760
4652960
5633160
6623260
7593461
8583561
9563671
10553771
11543871
12533971
13514081
14504082
15484192
16474292
174642102
184443112
194343113
204243123
214143123
224044133
233944134
243944144
253844144
263844154
273844154
283744154
293743154
303843154
313843154

Wind in July

Winds average 12 km/h in July, the calmest month.

Across July, daily wind ranges from about 12 km/h on the calmest days to 12 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (km/h)Feels
112light breeze
212light breeze
312light breeze
412light breeze
512light breeze
612light breeze
712light breeze
812light breeze
912light breeze
1012light breeze
1112light breeze
1212light breeze
1312light breeze
1412light breeze
1512light breeze
1612light breeze
1712light breeze
1812light breeze
1912light breeze
2012light breeze
2112light breeze
2212light breeze
2312light breeze
2412light breeze
2512light breeze
2612light breeze
2712light breeze
2812light breeze
2912light breeze
3012light breeze
3112light breeze

Sunrise & sunset in July

DaylightNight

Daylight runs from about 18 h 24 min at the start of July to 16 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over July. Sunrise moves from 3:10 AM to 4:04 AM, and sunset from 9:37 PM to 8:49 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
118.43:109:37
218.43:119:36
318.43:129:35
418.43:139:35
518.33:159:34
618.33:169:33
718.23:179:32
818.23:199:31
918.23:209:30
1018.13:219:28
1118.13:239:27
1218.03:259:26
1318.03:269:24
1417.93:289:23
1517.93:309:21
1617.83:329:20
1717.73:349:18
1817.73:369:16
1917.63:389:14
2017.53:409:12
2117.53:429:11
2217.43:449:09
2317.33:469:07
2417.33:489:04
2517.23:509:02
2617.13:529:00
2717.13:558:58
2817.03:578:56
2916.93:598:53
3016.84:018:51
3116.74:048:49

Solar energy in July

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in July, about 5.58 kWh/m².

For context, solar energy here swings from a low near 0.16 kWh/m² to a high of 5.82 kWh/m² in June across the year — July's 5.58 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.8Bright
25.8Bright
35.8Bright
45.8Bright
55.7Bright
65.7Bright
75.7Bright
85.7Bright
95.7Bright
105.7Bright
115.7Bright
125.7Bright
135.7Bright
145.7Bright
155.6Bright
165.6Bright
175.6Bright
185.6Bright
195.5Bright
205.5Bright
215.5Bright
225.5Bright
235.4Bright
245.4Bright
255.4Bright
265.3Bright
275.3Bright
285.3Bright
295.2Bright
305.2Bright
315.2Bright
Planning a trip in July

Is July a good time to visit Suomenlinna?

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

6.3
Sightseeing
1st-best month of the year
4.0
Beach & pool
1st-best month of the year

July is a reasonable time to visit Suomenlinna for sightseeing.

What to pack for Suomenlinna in July

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

In July, Suomenlinna sees daytime highs around 22°C and nights near 14°C. Worth packing: rain gear and sun protection. About 12 days see rain.

rain gearsun protection

Sea temperature near Suomenlinna in July

The nearest coast averages about 16°C in July — 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 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
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Suomenlinna in July

LowModerateHighVery highExtreme

Clear-sky midday UV in July 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 Suomenlinna 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 18UV 5Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5High
Jul5Moderate
Aug5Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Suomenlinna?

Suomenlinna sits at 60.1°N, 25.0°E, 0 m above sea level, in Finland. The nearest listed city is Helsinki, 4.0 km away.

Topography around Suomenlinna

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

Within 3 km, the terrain around Suomenlinna has only modest variations in elevation — a maximum elevation change of 35 m around an average of 3 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 83 m; within 80 km, only modest variations in elevation — a maximum elevation change of 193 m.

The land around Suomenlinna is covered by water (77%) within 3 km, water (62%) and trees (21%) within 16 km, and water (50%) and trees (38%) within 80 km.

3 km
35 m
16 km
83 m
80 km
193 m
treesgrasslandcroplandartificial surfaceswater
July weather nearby: Helsinki 4.0 km · Laajasalo 4.0 km · Kallio 5.0 km · Taka-Töölö 5.0 km · Herttoniemi 6.0 km · Lauttasaari 7.0 km · Munkkiniemi 8.0 km · Viikki 8.0 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 Suomenlinna (60.1478°, 24.9856°, elevation 0 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).