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Rule Fog Hunter

Helsinki - Fog Hunter - Southern Finland

Helsingfors, Uusimaa, Finland

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread5.9°C
Visibility24135 (Clear)
Relative Humidity64%
Wind Speed4.0m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki
fog weather icon
Next opportunity
Moderate Fog
Helsinki
Thu, Apr 16 · 14:00–19:00 · 5h window
Low confidence
26%
🌫️Fog Probability60.7-82.3%
Dewpoint Spread: 0.3°C
Visibility: 13664 (Clear)
Relative Humidity: 98%
Wind Speed: 1.5m/s (calm conditions)
fog weather icon
Dense Fog at Sunset
Helsinki
Thu, Apr 16 · 19:00–20:00
🌫️Fog Probability:97.3%
Medium
fog weather icon
Moderate Fog at Sunset
Helsinki
Thu, Apr 16 · 21:00–22:00
🌫️Fog Probability:60.1%
Low
fog weather icon
Dense Fog
Helsinki
Fri, Apr 17 · 24:00–01:00
🌫️Fog Probability:100%
Medium
fog weather icon
Moderate Fog
Helsinki
Sat, Apr 18 · 24:00–02:00
🌫️Fog Probability:62.7%
Low
fog weather icon
Moderate Fog
Helsinki
Sat, Apr 18 · 03:00–04:00
🌫️Fog Probability:64.9%
Low

What this forecast looks for

Plain-language explanation from the rule

Southern Finland's lake district and boreal forests create ideal conditions for fog photography. The region's 188,000 lakes, countless bogs, and mixed forests generate reliable morning mist from late summer through autumn.

What makes Southern Finland special for fog photography:

  • Lake fog - Large lakes like Vesijärvi and Saimaa produce dramatic ground fog at dawn
  • Bog mist - Torronsuo and other wetlands create ethereal low-lying fog over boardwalks
  • Forest atmosphere - Nuuksio and Repovesi offer misty woodland scenes with cliff viewpoints
  • Accessibility - Most locations within 2 hours of Helsinki

Peak fog season runs from August through October, with the strongest conditions occurring on calm, clear nights when temperatures drop near the dewpoint. Arrive before sunrise for the most dramatic mist.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Fog Probability
≥ 60.0%
Wed, Apr 8
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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Thu, Apr 9
24:000%
01:000%
02:000%
03:000%
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09:000%
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Fri, Apr 10
24:000%
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03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
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Sat, Apr 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
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20:000%
21:000%
22:000%
23:000%
Sun, Apr 12
24:000%
01:000%
02:000%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
Europe/Helsinki
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Thu, Apr 9 Sunrise 06:21 Sunset 20:23
05:00 ☾
100% -7.6°C 0mm 64% 0cm -9.9° -1.7°C 0mm 0.19kPa 24135m 9.8m/s 4m/s
06:00 ☾
100% -7.7°C 0mm 65% 0cm -3.3° -2°C 0mm 0.19kPa 24135m 9.9m/s 3.9m/s
07:00
100% -7.7°C 0mm 65% 0cm 4° -2°C 0mm 0.19kPa 24135m 9.8m/s 3.8m/s
08:00
100% -7.9°C 0mm 61% 0cm 11° -1.3°C 0mm 0.22kPa 24134m 9.5m/s 4m/s
09:00
100% -8.7°C 0mm 52% 0cm 19° -0.003°C 0mm 0.29kPa 24134m 8.3m/s 4.6m/s
10:00
100% -9.6°C 0mm 44% 0cm 25° 1.3°C 0mm 0.38kPa 24134m 7.6m/s 4.5m/s
11:00
100% -10°C 0mm 38% 0cm 31° 2.8°C 0mm 0.46kPa 24135m 7.1m/s 4.2m/s
12:00
100% -10°C 0mm 34% 0cm 35° 4°C 0mm 0.54kPa 24134m 6.7m/s 3.9m/s
13:00
99% -10°C 0mm 33% 0cm 37° 5°C 0mm 0.59kPa 24135m 6.4m/s 3.7m/s
14:00
99% -9.4°C 0mm 34% 0cm 37° 5.3°C 0mm 0.59kPa 24135m 6.2m/s 4m/s
15:00
98% -8.9°C 0mm 35% 0cm 34° 5.4°C 0mm 0.58kPa 24135m 5.7m/s 3.6m/s
16:00
95% -8.3°C 0mm 37% 0cm 30° 5.2°C 0mm 0.56kPa 24135m 5.5m/s 3.5m/s
17:00
92% -7.5°C 0mm 42% 0cm 24° 4.2°C 0mm 0.48kPa 24134m 5.6m/s 3.6m/s
18:00
89% -7.3°C 0mm 46% 0cm 17° 3.2°C 0mm 0.41kPa 24135m 5.4m/s 3.1m/s
19:00
87% -6.7°C 0mm 51% 0cm 9.5° 2.5°C 0mm 0.36kPa 24134m 5.6m/s 2.3m/s
20:00
86% -6.3°C 0mm 57% 0cm 2.3° 1.2°C 0mm 0.28kPa 24134m 3.9m/s 2m/s
21:00 ☾
84% -6.5°C 0mm 60% 0cm -5° 0.33°C 0mm 0.25kPa 24135m 3.4m/s 2m/s
22:00 ☾
80% -6.6°C 0mm 60% 0cm -11° 0.17°C 0mm 0.25kPa 24135m 4.8m/s 2.2m/s
23:00 ☾
77% -6.6°C 0mm 61% 0cm -16° 0.08°C 0mm 0.24kPa 24134m 6.6m/s 2.2m/s
Fri, Apr 10 Sunrise 06:21 Sunset 20:23
24:00 ☾
73% -6.4°C 0mm 62% 0cm -20° -0.03°C 0mm 0.23kPa 24134m 5.8m/s 2.2m/s
01:00 ☾
74% -6.5°C 0mm 62% 0cm -22° -0.12°C 0mm 0.23kPa 24135m 5.5m/s 2.3m/s
02:00 ☾
74% -6.8°C 0mm 62% 0cm -22° -0.42°C 0mm 0.23kPa 24134m 3.9m/s 2.1m/s
03:00 ☾
75% -7.3°C 0mm 61% 0cm -19° -0.7°C 0mm 0.23kPa 24135m 4.2m/s 2.2m/s
04:00 ☾
71% -7.5°C 0mm 60% 0cm -15° -0.75°C 0mm 0.23kPa 24134m 5.4m/s 2.3m/s
05:00 ☾
66% -7.7°C 0mm 59% 0cm -9.5° -0.61°C 0mm 0.24kPa 24134m 6m/s 2.4m/s
06:00 ☾
62% -7.7°C 0mm 59% 0cm -2.9° -0.68°C 0mm 0.24kPa 24135m 6.3m/s 2.4m/s
07:00
59% -7.6°C 0mm 59% 0cm 4.4° -0.55°C 0mm 0.24kPa 24134m 6.2m/s 2.3m/s
08:00
55% -7.4°C 0mm 55% 0cm 12° 0.47°C 0mm 0.28kPa 24134m 6.3m/s 2.5m/s
09:00
52% -7.6°C 0mm 49% 0cm 19° 1.9°C 0mm 0.35kPa 24135m 5.4m/s 2.8m/s
10:00
47% -8.1°C 0mm 43% 0cm 26° 3.2°C 0mm 0.44kPa 24134m 5.6m/s 3.4m/s
11:00
43% -8.6°C 0mm 39% 0cm 32° 4°C 0mm 0.5kPa 24134m 5.9m/s 3.8m/s
12:00
38% -8.9°C 0mm 37% 0cm 36° 4.6°C 0mm 0.54kPa 24135m 5.6m/s 3.7m/s
13:00
37% -9.2°C 0mm 35% 0cm 38° 5.1°C 0mm 0.57kPa 24135m 5.4m/s 3.7m/s
14:00
37% -9.4°C 0mm 34% 0cm 37° 5.2°C 0mm 0.59kPa 24134m 5.4m/s 3.6m/s
15:00
36% -10°C 0mm 32% 0cm 35° 5.6°C 0mm 0.62kPa 24134m 4.8m/s 3m/s
16:00
39% -9.9°C 0mm 32% 0cm 30° 5.6°C 0mm 0.62kPa 24134m 4.4m/s 2.6m/s
17:00
43% -9.2°C 0mm 34% 0cm 24° 5.3°C 0mm 0.59kPa 24134m 3.6m/s 2.3m/s
18:00
46% -8.2°C 0mm 39% 0cm 17° 4.7°C 0mm 0.52kPa 24134m 1.8m/s 1.4m/s
19:00
40% -6.5°C 0mm 47% 0cm 9.8° 3.8°C 0mm 0.43kPa 24134m 1.4m/s 1.1m/s
20:00
35% -6.8°C 0mm 49% 0cm 2.6° 2.9°C 0mm 0.38kPa 24135m 1.5m/s 1.5m/s
21:00 ☾
29% -6.6°C 0mm 53% 0cm -4.6° 2.1°C 0mm 0.33kPa 24135m 1.8m/s 1.8m/s
22:00 ☾
32% -6.3°C 0mm 57% 0cm -11° 1.3°C 0mm 0.29kPa 24135m 1.9m/s 1.9m/s
23:00 ☾
35% -5.9°C 0mm 61% 0cm -16° 0.75°C 0mm 0.25kPa 24134m 2.2m/s 2.1m/s
Sat, Apr 11 Sunrise 06:18 Sunset 20:25
24:00 ☾
38% -6°C 0mm 62% 0cm -20° 0.38°C 0mm 0.24kPa 24135m 3.4m/s 2.3m/s
01:00 ☾
39% -6.4°C 0mm 62% 0cm -21° 0.09°C 0mm 0.24kPa 24134m 5.7m/s 2.6m/s
02:00 ☾
41% -6.5°C 0mm 62% 0cm -21° -0.11°C 0mm 0.23kPa 24135m 6.8m/s 2.6m/s
03:00 ☾
42% -6.7°C 0mm 62% 0cm -19° -0.41°C 0mm 0.22kPa 24134m 7.6m/s 2.9m/s
04:00 ☾
53% -6.7°C 0mm 63% 0cm -15° -0.51°C 0mm 0.22kPa 24134m 7.7m/s 3m/s
05:00 ☾
64% -6.7°C 0mm 63% 0cm -9.2° -0.63°C 0mm 0.21kPa 24134m 8m/s 3m/s
06:00 ☾
75% -6.8°C 0mm 63% 0cm -2.5° -0.74°C 0mm 0.21kPa 24135m 7.9m/s 2.9m/s
07:00
75% -7°C 0mm 61% 0cm 4.7° -0.44°C 0mm 0.23kPa 24135m 8.4m/s 3.1m/s
08:00
74% -6.8°C 0mm 55% 0cm 12° 1.2°C 0mm 0.3kPa 24135m 8.7m/s 3.3m/s
09:00
74% -6.6°C 0mm 50% 0cm 19° 2.8°C 0mm 0.37kPa 24135m 8.2m/s 3.8m/s
10:00
74% -3.9°C 0mm 61% 0cm 26° 2.8°C 0mm 0.29kPa 24135m 9.7m/s 5m/s
11:00
74% -1.7°C 0mm 72% 0cm 32° 2.9°C 0mm 0.21kPa 24135m 11m/s 6.3m/s
12:00
74% 0.3°C 0mm 83% 0cm 36° 2.9°C 0mm 0.13kPa 24135m 13m/s 7.5m/s
13:00
72% 0.2°C 0mm 83% 0cm 38° 2.9°C 0mm 0.13kPa 24135m 11m/s 6.8m/s
14:00
70% 0.1°C 0mm 82% 0cm 38° 2.8°C 0mm 0.13kPa 24135m 9m/s 6.2m/s
15:00
68% 0°C 0mm 82% 0cm 35° 2.8°C 0mm 0.13kPa 24135m 7.2m/s 5.6m/s
16:00
63% 0.1°C 0mm 83% 0cm 30° 2.7°C 0mm 0.12kPa 24135m 7.4m/s 5.6m/s
17:00
59% 0.2°C 0mm 85% 0cm 24° 2.5°C 0mm 0.11kPa 24135m 7.6m/s 5.6m/s
18:00
54% 0.3°C 0mm 86% 0cm 17° 2.4°C 0mm 0.1kPa 24135m 7.7m/s 5.6m/s
19:00
51% 0.4°C 0mm 87% 0cm 10° 2.3°C 0mm 0.09kPa 24135m 7.6m/s 5.5m/s
20:00
47% 0.5°C 0mm 89% 0cm 2.9° 2.1°C 0mm 0.08kPa 24135m 7.4m/s 5.4m/s
21:00 ☾
44% 0.6°C 0mm 90% 0cm -4.3° 2°C 0mm 0.07kPa 24135m 7.2m/s 5.4m/s
22:00 ☾
46% 0.5°C 0mm 91% 0cm -11° 1.9°C 0mm 0.07kPa 24135m 7.2m/s 5.3m/s
23:00 ☾
48% 0.5°C 0mm 91% 0cm -16° 1.8°C 0mm 0.06kPa 24135m 7.2m/s 5.2m/s
Sun, Apr 12 Sunrise 06:15 Sunset 20:28
24:00 ☾
50% 0.5°C 0mm 92% 0cm -19° 1.7°C 0mm 0.06kPa 24135m 7.1m/s 5.1m/s
01:00 ☾
45% 0.6°C 0mm 92% 0cm -21° 1.7°C 0mm 0.05kPa 24135m 7.2m/s 5.2m/s
02:00 ☾
40% 0.6°C 0mm 92% 0cm -21° 1.7°C 0mm 0.05kPa 24135m 7.2m/s 5.3m/s
03:00 ☾
35% 0.7°C 0mm 93% 0cm -18° 1.7°C 0mm 0.05kPa 24135m 7.3m/s 5.4m/s
04:00 ☾
36% 0.7°C 0mm 93% 0cm -14° 1.7°C 0mm 0.05kPa 20743m 7.7m/s 5.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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