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Rule Fog Hunter

Porvoo - Fog Hunter - Southern Finland

Porvoo, Uusimaa, Finland

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread1.6°C
Visibility24134 (Clear)
Relative Humidity89%
Wind Speed2.6m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki
fog weather icon
Next opportunity
Dense Fog (lingering) at Sunrise
Porvoo
Tomorrow · 06:00–08:00 · 2h window
High confidence
92%
🌫️Fog Probability100%
Dewpoint Spread: 0.1°C
Visibility: 1065 (Mist/Haze)
Relative Humidity: 99%
Wind Speed: 1.3m/s (calm conditions)
fog weather icon
Dense Fog (lingering)
Porvoo
Tomorrow · 08:00–11:00
🌫️Fog Probability:100%
Medium

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
5matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Fog Probability
≥ 85.0%
Dewpoint Spread
≤ 2.0°C
Visibility
≤ 3000.0m
Wind Speed
≤ 2.0m/s
Wed, Mar 4
09:000%3°C24135m4.5m/s
10:000%3.2°C24135m5m/s
11:000%3.2°C24134m5.6m/s
12:000%2.9°C24135m5.9m/s
13:000%3.1°C24134m5.5m/s
14:000%1°C3180m5m/s
15:0054%0.7°C1899m4.9m/s
16:0068%0.6°C317m5m/s
17:000%2.4°C24135m5.5m/s
18:000%1.4°C24135m5.8m/s
19:0027%0.5°C3051m5.7m/s
20:000%1.6°C24135m5.5m/s
21:0043%0.7°C11877m5.1m/s
22:000%1.1°C24134m5.4m/s
23:000%1.7°C24134m5.4m/s
Thu, Mar 5
24:000%2.3°C24135m5.5m/s
01:000%2.5°C24135m5.3m/s
02:000%2.7°C24134m5.4m/s
03:000%2.3°C24135m5.2m/s
04:000%2°C24134m4.8m/s
05:000%1.9°C24135m4m/s
06:000%1.8°C24134m3.6m/s
07:000%1.9°C24134m3.3m/s
08:000%1.8°C24134m2.9m/s
09:000%1.6°C24134m2.6m/s
10:000%1.9°C24134m3.3m/s
11:000%2.2°C24134m3.4m/s
12:000%2.5°C24135m3.5m/s
13:000%2.6°C24135m3.6m/s
14:000%2.5°C24135m3.1m/s
15:000%2.1°C24134m3.1m/s
16:000%1.8°C24135m2.8m/s
17:000%1°C24134m1.9m/s
18:0067%0.4°C24135m1.2m/s
19:0067%0.3°C24135m1.3m/s
20:0067%0.3°C24135m1m/s
21:0069%0.3°C24134m0.85m/s
22:0069%0.2°C24134m0.66m/s
23:0069%0.2°C22019m0.39m/s
Fri, Mar 6
24:0069%0.1°C21282m0.78m/s
01:0069%0.2°C21004m0.8m/s
02:0069%0.1°C20455m1.1m/s
03:0069%0.1°C20023m1.1m/s
04:0069%0.2°C20909m1.3m/s
05:0097%0.2°C5000m1.2m/s
06:00100%0.1°C1065m1.3m/s
07:00100%0°C452m1.2m/s
08:00100%0.1°C218m1.6m/s
09:00100%0.4°C254m1.8m/s
10:00100%0.7°C730m1.9m/s
11:000%1.5°C22788m1.9m/s
12:000%2.5°C22881m2.2m/s
13:000%3.1°C23316m2.5m/s
14:000%3°C24135m2.7m/s
15:000%2.5°C24135m2.7m/s
16:000%2.2°C24134m2.9m/s
17:000%1.9°C24134m3.1m/s
18:000%1.2°C24135m3.2m/s
19:000%1.1°C24135m3.3m/s
20:0051%1°C24134m3.2m/s
21:0051%0.7°C24134m3m/s
22:0054%0.6°C24134m2.9m/s
23:0054%0.6°C24134m2.8m/s
Sat, Mar 7
24:0054%0.5°C24134m2.8m/s
01:0054%0.6°C24135m3.2m/s
02:000%1.5°C24135m4.2m/s
03:000%1.8°C24135m3.9m/s
04:000%1.3°C24135m4m/s
05:000%2°C24134m4.6m/s
06:000%2.8°C24134m4.6m/s
07:000%3°C24135m4.1m/s
08:000%3°C24135m3.5m/s
09:000%3.2°C24135m3.4m/s
10:000%3.3°C24135m3.1m/s
11:000%4.4°C24134m3.1m/s
12:000%5.7°C24135m3.3m/s
13:000%5.7°C24135m3.2m/s
14:000%5.3°C24135m2.9m/s
15:000%3.8°C24135m2.5m/s
16:000%2.4°C24135m2.1m/s
17:000%1.2°C24135m1.6m/s
18:000%1.4°C24135m1.8m/s
19:000%1.6°C24135m2m/s
20:000%1.7°C24135m2.2m/s
21:000%2°C24135m2.3m/s
22:000%2.3°C24135m2.4m/s
23:000%2.5°C24135m2.5m/s
Sun, Mar 8
24:000%2.5°C24135m2.6m/s
01:000%2.4°C24135m2.8m/s
02:000%2.4°C24135m3m/s
03:000%2.7°C24135m3.1m/s
04:000%3.1°C24135m3.1m/s
05:000%3.5°C24135m3.2m/s
06:000%3.4°C24135m3.2m/s
07:000%3.4°C24135m3.3m/s
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
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Wind Gusts
m/s
Thu, Mar 5 Sunrise 07:05 Sunset 17:53
09:00
-2.2°C 0mm 89% 0cm -0.56°C 0mm 0.07kPa 9.2m/s
10:00
-1.5°C 0mm 87% 0cm 0.44°C 0mm 0.08kPa 7.9m/s
11:00
-1.1°C 0mm 85% 0cm 1.1°C 0mm 0.1kPa 7.2m/s
12:00
-0.7°C 0mm 84% 0cm 1.8°C 0mm 0.11kPa 6.6m/s
13:00
-0.4°C 0mm 83% 0cm 2.2°C 0mm 0.12kPa 6.9m/s
14:00
0°C 0mm 84% 0cm 2.5°C 0mm 0.12kPa 6.6m/s
15:00
0.4°C 0mm 86% 0cm 2.5°C 0mm 0.1kPa 7.9m/s
16:00
0.3°C 0mm 88% 0cm 2.1°C 0mm 0.08kPa 7.8m/s
17:00
-0.1°C 0mm 93% 0cm 0.95°C 0mm 0.05kPa 4.7m/s
18:00 ☾
-1.9°C 0mm 97% 0cm -1.5°C 0mm 0.02kPa 1.1m/s
19:00 ☾
-2.4°C 0mm 97% 0cm -2.1°C 0mm 0.01kPa 1.2m/s
20:00 ☾
-2.7°C 0mm 98% 0cm -2.4°C 0mm 0.01kPa 1m/s
21:00 ☾
-3°C 0mm 98% 0cm -2.7°C 0mm 0.01kPa 0.82m/s
22:00 ☾
-3.2°C 0mm 98% 0cm -3°C 0mm 0.01kPa 0.7m/s
23:00 ☾
-3.4°C 0mm 99% 0cm -3.2°C 0mm 0.01kPa 0.3m/s
Fri, Mar 6 Sunrise 07:05 Sunset 17:53
24:00 ☾
-3.4°C 0mm 99% 0cm -3.3°C 0mm 0.01kPa 0.71m/s
01:00 ☾
-3.5°C 0mm 99% 0cm -3.3°C 0mm 0.01kPa 0.81m/s
02:00 ☾
-3.4°C 0mm 99% 0cm -3.3°C 0mm 0kPa 1.1m/s
03:00 ☾
-3.4°C 0mm 99% 0cm -3.3°C 0mm 0kPa 2.4m/s
04:00 ☾
-3.3°C 0mm 99% 0cm -3.1°C 0mm 0kPa 3.7m/s
05:00 ☾
-3.2°C 0mm 99% 0cm -3°C 0mm 0kPa 3.5m/s
06:00 ☾
-2.9°C 0mm 99% 0cm -2.8°C 0mm 0kPa 3.3m/s
07:00 ☾
-3°C 0mm 99% 0cm -3°C 0mm 0kPa 2.4m/s
08:00
-2.3°C 0mm 99% 0cm -2.2°C 0mm 0.01kPa 4.2m/s
09:00
-1.1°C 0mm 97% 0cm -0.67°C 0mm 0.02kPa 4.2m/s
10:00
-0.2°C 0mm 95% 0cm 0.47°C 0mm 0.03kPa 3.6m/s
11:00
0.2°C 0mm 90% 0cm 1.7°C 0mm 0.07kPa 3.9m/s
12:00
0.5°C 0mm 84% 0cm 3°C 0mm 0.13kPa 4.4m/s
13:00
0.6°C 0mm 80% 0cm 3.7°C 0mm 0.15kPa 4.8m/s
14:00
0.6°C 0mm 81% 0cm 3.6°C 0mm 0.15kPa 5.6m/s
15:00
0.5°C 0mm 84% 0cm 3°C 0mm 0.12kPa 7.4m/s
16:00
0°C 0mm 85% 0cm 2.2°C 0mm 0.11kPa 10m/s
17:00
-0.6°C 0mm 87% 0cm 1.3°C 0mm 0.09kPa 9.9m/s
18:00 ☾
-1°C 0mm 92% 0cm 0.17°C 0mm 0.05kPa 11m/s
19:00 ☾
-1.1°C 0mm 92% 0cm -0.05°C 0mm 0.05kPa 11m/s
20:00 ☾
-1.1°C 0mm 93% 0cm -0.15°C 0mm 0.04kPa 10m/s
21:00 ☾
-1.2°C 0mm 95% 0cm -0.49°C 0mm 0.03kPa 10m/s
22:00 ☾
-1.4°C 0mm 96% 0cm -0.77°C 0mm 0.03kPa 9.6m/s
23:00 ☾
-1.4°C 0mm 96% 0cm -0.78°C 0mm 0.02kPa 10m/s
Sat, Mar 7 Sunrise 07:02 Sunset 17:56
24:00 ☾
-1.3°C 0mm 96% 0cm -0.78°C 0mm 0.02kPa 10m/s
01:00 ☾
-1.3°C 0mm 96% 0cm -0.66°C 0mm 0.03kPa 9.6m/s
02:00 ☾
-1.2°C 0mm 89% 0cm 0.34°C 0mm 0.07kPa 9.9m/s
03:00 ☾
-0.9°C 0mm 87% 0cm 0.9°C 0mm 0.08kPa 10m/s
04:00 ☾
-0.5°C 0mm 91% 0cm 0.76°C 0mm 0.06kPa 12m/s
05:00 ☾
-0.5°C 0mm 86% 0cm 1.5°C 0mm 0.09kPa 12m/s
06:00 ☾
-1°C 0mm 82% 0cm 1.8°C 0mm 0.13kPa 11m/s
07:00
-1.4°C 0mm 80% 0cm 1.6°C 0mm 0.13kPa 11m/s
08:00
-2°C 0mm 80% 0cm 1°C 0mm 0.13kPa 11m/s
09:00
-2°C 0mm 79% 0cm 1.2°C 0mm 0.14kPa 11m/s
10:00
-1.6°C 0mm 79% 0cm 1.7°C 0mm 0.15kPa 10m/s
11:00
-1.9°C 0mm 73% 0cm 2.5°C 0mm 0.2kPa 9.6m/s
12:00
-2.6°C 0mm 66% 0cm 3.1°C 0mm 0.26kPa 8.5m/s
13:00
-2.3°C 0mm 66% 0cm 3.4°C 0mm 0.27kPa 8.9m/s
14:00
-1.7°C 0mm 68% 0cm 3.6°C 0mm 0.25kPa 8.9m/s
15:00
-1.9°C 0mm 76% 0cm 1.9°C 0mm 0.17kPa 7.3m/s
16:00
-2.2°C 0mm 84% 0cm 0.16°C 0mm 0.1kPa 5.7m/s
17:00
-2.7°C 0mm 92% 0cm -1.5°C 0mm 0.05kPa 4.1m/s
18:00 ☾
-2.9°C 0mm 90% 0cm -1.5°C 0mm 0.05kPa 5.3m/s
19:00 ☾
-3.1°C 0mm 89% 0cm -1.5°C 0mm 0.06kPa 6.6m/s
20:00 ☾
-3.2°C 0mm 88% 0cm -1.5°C 0mm 0.07kPa 7.8m/s
21:00 ☾
-3.5°C 0mm 86% 0cm -1.5°C 0mm 0.08kPa 8.7m/s
22:00 ☾
-3.8°C 0mm 84% 0cm -1.5°C 0mm 0.09kPa 9.5m/s
23:00 ☾
-4°C 0mm 83% 0cm -1.5°C 0mm 0.09kPa 10m/s
Sun, Mar 8 Sunrise 06:59 Sunset 17:58
24:00 ☾
-3.6°C 0mm 83% 0cm -1.1°C 0mm 0.09kPa 11m/s
01:00 ☾
-3.2°C 0mm 84% 0cm -0.79°C 0mm 0.09kPa 11m/s
02:00 ☾
-2.8°C 0mm 84% 0cm -0.44°C 0mm 0.09kPa 11m/s
03:00 ☾
-2.2°C 0mm 82% 0cm 0.47°C 0mm 0.11kPa 11m/s
04:00 ☾
-1.7°C 0mm 80% 0cm 1.4°C 0mm 0.14kPa 11m/s
05:00 ☾
-1.2°C 0mm 78% 0cm 2.3°C 0mm 0.16kPa 10m/s
06:00 ☾
-0.7°C 0mm 78% 0cm 2.7°C 0mm 0.16kPa 11m/s
07:00
-0.2°C 0mm 79% 0cm 3.2°C 0mm 0.16kPa 11m/s
08:00
0.4°C 0mm 79% 0cm 3.6°C 0mm 0.17kPa 11m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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