What conditions does Fog Hunter look for?

Fog Probability: ≥ 85.0%. Dewpoint Spread: ≤ 2.0°C. Visibility: ≤ 3000.0m. Wind Speed: ≤ 2.0m/s

How often do conditions match?

There are 6 upcoming opportunity windows in the next 10 days.

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Rule Fog Hunter

Vesijärvi - Fog Hunter - Southern Finland

Lahti, Päijänne Tavastia, Finland

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions

Fog Probability

Dewpoint Spread1.9°C

Visibility24134 (Clear)

Relative Humidity87%

Wind Speed5.0m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

Next opportunity

Dense Fog (lingering)

Vesijärvi

Tomorrow · 04:00–06:00 · 2h window

High confidence

71%

🌫️Fog Probability100%

Dewpoint Spread: 0.1°C

Visibility: 743 (Fog)

Relative Humidity: 100%

Wind Speed: 1.5m/s (calm conditions)

Dense Fog (lingering) at Sunrise

Vesijärvi

Tomorrow · 06:00–09:00

🌫️Fog Probability:100%

Medium

Dense Fog (lingering)

Vesijärvi

Tue, Mar 10 · 20:00–01:00

🌫️Fog Probability:94.4-100%

Medium

Dense Fog (lingering)

Vesijärvi

Wed, Mar 11 · 16:00–17:00

🌫️Fog Probability:97.2%

Medium

Dense Fog (lingering) at Sunset

Vesijärvi

Wed, Mar 11 · 17:00–18:00

🌫️Fog Probability:97.2%

Medium

Dense Fog (lingering)

Vesijärvi

Thu, Mar 12 · 02:00–03:00

🌫️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 92 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
06:00	0%	2.5°C	24134m	5.4m/s
07:00	0%	2.7°C	24134m	5.2m/s
08:00	0%	3°C	24134m	5.5m/s
09:00	0%	2.9°C	24135m	5.2m/s
10:00	0%	2.8°C	24135m	5.9m/s
11:00	0%	1.7°C	24134m	5.9m/s
12:00	0%	1.4°C	24135m	5.9m/s
13:00	31%	0.3°C	576m	5.2m/s
14:00	33%	0.2°C	95m	5.1m/s
15:00	32%	0.2°C	76m	5.1m/s
16:00	36%	0.3°C	72m	5m/s
17:00	0%	0.4°C	137m	5.4m/s
18:00	0%	0.4°C	55m	5.6m/s
19:00	0%	0.3°C	103m	5.3m/s
20:00	0%	0.2°C	54m	4.9m/s
21:00	71%	0.2°C	813m	5m/s
22:00	50%	0.4°C	7031m	5.3m/s
23:00	0%	1.1°C	24134m	5.4m/s
Thu, Mar 5
24:00	0%	1.7°C	24135m	5.5m/s
01:00	0%	2.5°C	24135m	5.5m/s
02:00	0%	1.9°C	24134m	5.4m/s
03:00	0%	1.7°C	24135m	5.7m/s
04:00	0%	1.9°C	24134m	5m/s
05:00	0%	1.8°C	24134m	4m/s
06:00	0%	1.7°C	24134m	3.7m/s
07:00	0%	1.5°C	24135m	3.6m/s
08:00	0%	1.5°C	24134m	3.5m/s
09:00	0%	1.6°C	24135m	3.5m/s
10:00	0%	1.8°C	24135m	3.5m/s
11:00	0%	2.3°C	24134m	3.5m/s
12:00	0%	2.2°C	24134m	3.5m/s
13:00	0%	2°C	24134m	3.6m/s
14:00	0%	2°C	24135m	3.2m/s
15:00	0%	1.5°C	24134m	2.9m/s
16:00	0%	1.3°C	24134m	2.5m/s
17:00	60%	0.8°C	24134m	1.7m/s
18:00	67%	0.4°C	24135m	1.2m/s
19:00	69%	0.2°C	18374m	1.2m/s
20:00	78%	0.2°C	14852m	1m/s
21:00	78%	0.2°C	14414m	0.86m/s
22:00	78%	0.2°C	13188m	0.5m/s
23:00	78%	0.1°C	12416m	0.25m/s
Fri, Mar 6
24:00	78%	0.1°C	11857m	0.86m/s
01:00	78%	0.1°C	11609m	1.3m/s
02:00	78%	0.1°C	12305m	1.3m/s
03:00	86%	0°C	6609m	1.5m/s
04:00	100%	0.1°C	743m	1.5m/s
05:00	100%	0.1°C	332m	1.4m/s
06:00	100%	0°C	259m	1.5m/s
07:00	100%	0°C	250m	1.5m/s
08:00	100%	0°C	236m	1.7m/s
09:00	83%	0.2°C	6388m	1.9m/s
10:00	0%	1.1°C	24135m	2.1m/s
11:00	0%	1.3°C	24134m	2.3m/s
12:00	0%	1.2°C	24134m	2.4m/s
13:00	0%	1.3°C	24135m	2.5m/s
14:00	0%	1.5°C	24134m	2.9m/s
15:00	0%	1.8°C	24134m	3.2m/s
16:00	0%	1.7°C	24135m	3.3m/s
17:00	0%	1.4°C	24134m	3.3m/s
18:00	0%	1.1°C	24134m	3m/s
19:00	51%	0.9°C	24134m	3.1m/s
20:00	51%	0.9°C	24135m	3.3m/s
21:00	51%	0.7°C	24135m	3.1m/s
22:00	54%	0.6°C	24134m	2.8m/s
23:00	57%	0.4°C	24134m	2.6m/s
Sat, Mar 7
24:00	0%	1°C	24134m	4m/s
01:00	0%	1.6°C	24135m	4.1m/s
02:00	51%	1°C	24135m	3.7m/s
03:00	36%	1°C	24135m	4.1m/s
04:00	0%	1.3°C	24135m	4.4m/s
05:00	0%	1.9°C	24134m	4.1m/s
06:00	0%	1.6°C	24135m	3.6m/s
07:00	0%	1.3°C	24134m	3.6m/s
08:00	0%	1.2°C	24135m	3.4m/s
09:00	0%	1.2°C	24135m	2.7m/s
10:00	0%	1.3°C	24135m	2m/s
11:00	0%	1.3°C	24135m	1.3m/s
12:00	0%	1.1°C	24135m	1.3m/s
13:00	53%	0.8°C	24135m	1.3m/s
14:00	56%	0.6°C	24135m	1.2m/s
15:00	56%	0.7°C	24135m	1.2m/s
16:00	64%	0.6°C	24135m	1.2m/s
17:00	60%	0.7°C	24135m	1.2m/s
18:00	60%	0.8°C	24135m	1.4m/s
19:00	0%	1.1°C	24135m	1.6m/s
20:00	0%	1.2°C	24135m	1.9m/s
21:00	0%	1.4°C	24135m	2.1m/s
22:00	0%	1.6°C	24135m	2.3m/s
23:00	0%	1.9°C	24135m	2.5m/s
Sun, Mar 8
24:00	0%	2.2°C	24135m	2.6m/s
01:00	0%	2.4°C	24135m	2.7m/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 07:06 Sunset 17:52
04:00 ☾	-3.3°C	0mm	87%	0cm	-1.4°C	0mm	0.07kPa	13m/s
05:00 ☾	-4.2°C	0mm	87%	0cm	-2.4°C	0mm	0.07kPa	13m/s
06:00 ☾	-4.7°C	0mm	88%	0cm	-3°C	0mm	0.06kPa	13m/s
07:00 ☾	-4.9°C	0mm	89%	0cm	-3.4°C	0mm	0.05kPa	13m/s
08:00	-4.7°C	0mm	89%	0cm	-3.2°C	0mm	0.05kPa	12m/s
09:00	-3.9°C	0mm	89%	0cm	-2.3°C	0mm	0.06kPa	12m/s
10:00	-3.2°C	0mm	87%	0cm	-1.4°C	0mm	0.07kPa	10m/s
11:00	-3.1°C	0mm	84%	0cm	-0.77°C	0mm	0.09kPa	7.8m/s
12:00	-2.5°C	0mm	85%	0cm	-0.3°C	0mm	0.09kPa	7.2m/s
13:00	-1.9°C	0mm	86%	0cm	0.1°C	0mm	0.08kPa	7.8m/s
14:00	-1.7°C	0mm	86%	0cm	0.32°C	0mm	0.09kPa	6.8m/s
15:00	-1°C	0mm	89%	0cm	0.51°C	0mm	0.07kPa	7.5m/s
16:00	-0.9°C	0mm	91%	0cm	0.38°C	0mm	0.06kPa	7.8m/s
17:00	-1.6°C	0mm	94%	0cm	-0.79°C	0mm	0.03kPa	4.1m/s
18:00 ☾	-3.9°C	0mm	97%	0cm	-3.5°C	0mm	0.01kPa	1.2m/s
19:00 ☾	-4.7°C	0mm	98%	0cm	-4.5°C	0mm	0.01kPa	1.2m/s
20:00 ☾	-5.2°C	0mm	99%	0cm	-5°C	0mm	0.01kPa	1m/s
21:00 ☾	-5.2°C	0mm	99%	0cm	-5°C	0mm	0.01kPa	0.81m/s
22:00 ☾	-5.6°C	0mm	99%	0cm	-5.4°C	0mm	0.01kPa	0.51m/s
23:00 ☾	-5.9°C	0mm	99%	0cm	-5.8°C	0mm	0kPa	0.2m/s
Fri, Mar 6 Sunrise 07:06 Sunset 17:52
24:00 ☾	-6.1°C	0mm	99%	0cm	-6°C	0mm	0kPa	0.81m/s
01:00 ☾	-6.1°C	0mm	99%	0cm	-6°C	0mm	0kPa	1.2m/s
02:00 ☾	-5.8°C	0mm	99%	0cm	-5.7°C	0mm	0kPa	1.6m/s
03:00 ☾	-4.8°C	0mm	100%	0cm	-4.8°C	0mm	0kPa	4.6m/s
04:00 ☾	-4.4°C	0mm	100%	0cm	-4.3°C	0mm	0kPa	5.1m/s
05:00 ☾	-4.1°C	0mm	100%	0cm	-4°C	0mm	0kPa	4.7m/s
06:00 ☾	-4°C	0mm	100%	0cm	-4°C	0mm	0kPa	4.6m/s
07:00 ☾	-4°C	0mm	100%	0cm	-4°C	0mm	0kPa	5m/s
08:00	-3.2°C	0mm	100%	0cm	-3.2°C	0mm	0kPa	5.7m/s
09:00	-1.8°C	0mm	98%	0cm	-1.6°C	0mm	0.01kPa	5.3m/s
10:00	-0.7°C	0mm	93%	0cm	0.37°C	0mm	0.05kPa	5.3m/s
11:00	0.3°C	0mm	91%	0cm	1.6°C	0mm	0.06kPa	5.5m/s
12:00	1.1°C	0mm	91%	0cm	2.3°C	0mm	0.06kPa	6.4m/s
13:00	1.6°C	0mm	91%	0cm	2.9°C	0mm	0.07kPa	7.8m/s
14:00	1.7°C	0mm	90%	0cm	3.2°C	0mm	0.08kPa	9.8m/s
15:00	1.4°C	0mm	88%	0cm	3.2°C	0mm	0.09kPa	10m/s
16:00	1.1°C	0mm	89%	0cm	2.8°C	0mm	0.08kPa	9.5m/s
17:00	0.6°C	0mm	90%	0cm	2°C	0mm	0.07kPa	9.7m/s
18:00 ☾	-0.3°C	0mm	92%	0cm	0.82°C	0mm	0.05kPa	9m/s
19:00 ☾	-0.7°C	0mm	94%	0cm	0.21°C	0mm	0.04kPa	11m/s
20:00 ☾	-0.9°C	0mm	94%	0cm	-0.01°C	0mm	0.04kPa	11m/s
21:00 ☾	-1.2°C	0mm	95%	0cm	-0.52°C	0mm	0.03kPa	10m/s
22:00 ☾	-1.7°C	0mm	96%	0cm	-1.1°C	0mm	0.02kPa	10m/s
23:00 ☾	-2°C	0mm	97%	0cm	-1.6°C	0mm	0.02kPa	9.7m/s
Sat, Mar 7 Sunrise 07:03 Sunset 17:55
24:00 ☾	-1.2°C	0mm	93%	0cm	-0.18°C	0mm	0.04kPa	9.5m/s
01:00 ☾	-1.3°C	0mm	89%	0cm	0.25°C	0mm	0.07kPa	9.7m/s
02:00 ☾	-0.8°C	0mm	93%	0cm	0.15°C	0mm	0.04kPa	11m/s
03:00 ☾	-0.5°C	0mm	93%	0cm	0.46°C	0mm	0.04kPa	12m/s
04:00 ☾	-0.4°C	0mm	91%	0cm	0.9°C	0mm	0.06kPa	12m/s
05:00 ☾	-0.8°C	0mm	87%	0cm	1.1°C	0mm	0.08kPa	12m/s
06:00 ☾	-1.6°C	0mm	89%	0cm	-0.03°C	0mm	0.07kPa	11m/s
07:00 ☾	-2.1°C	0mm	91%	0cm	-0.77°C	0mm	0.05kPa	12m/s
08:00	-2.1°C	0mm	91%	0cm	-0.85°C	0mm	0.05kPa	12m/s
09:00	-1.7°C	0mm	91%	0cm	-0.49°C	0mm	0.05kPa	8.3m/s
10:00	-1.4°C	0mm	91%	0cm	-0.12°C	0mm	0.05kPa	4.8m/s
11:00	-1.1°C	0mm	91%	0cm	0.25°C	0mm	0.06kPa	1.3m/s
12:00	-2°C	0mm	92%	0cm	-0.94°C	0mm	0.04kPa	1.3m/s
13:00	-2.9°C	0mm	94%	0cm	-2.1°C	0mm	0.03kPa	1.2m/s
14:00	-3.9°C	0mm	96%	0cm	-3.3°C	0mm	0.02kPa	1.2m/s
15:00	-4.1°C	0mm	96%	0cm	-3.4°C	0mm	0.02kPa	1.2m/s
16:00	-4.2°C	0mm	95%	0cm	-3.6°C	0mm	0.02kPa	1.1m/s
17:00	-4.4°C	0mm	95%	0cm	-3.7°C	0mm	0.02kPa	1.1m/s
18:00 ☾	-4.4°C	0mm	94%	0cm	-3.6°C	0mm	0.03kPa	2.9m/s
19:00 ☾	-4.5°C	0mm	93%	0cm	-3.4°C	0mm	0.04kPa	4.7m/s
20:00 ☾	-4.5°C	0mm	91%	0cm	-3.3°C	0mm	0.04kPa	6.5m/s
21:00 ☾	-4.4°C	0mm	90%	0cm	-3°C	0mm	0.05kPa	7.8m/s
22:00 ☾	-4.3°C	0mm	88%	0cm	-2.7°C	0mm	0.06kPa	9.1m/s
23:00 ☾	-4.3°C	0mm	87%	0cm	-2.4°C	0mm	0.07kPa	10m/s
Sun, Mar 8 Sunrise 07:00 Sunset 17:57
24:00 ☾	-4.3°C	0mm	85%	0cm	-2.1°C	0mm	0.08kPa	11m/s
01:00 ☾	-4.3°C	0mm	84%	0cm	-1.9°C	0mm	0.09kPa	11m/s
02:00 ☾	-4.3°C	0mm	82%	0cm	-1.6°C	0mm	0.1kPa	12m/s
03:00 ☾	-4.2°C	0mm	77%	0cm	-0.77°C	0mm	0.13kPa	12m/s

How to read: these inputs help produce the derived score; they are not requirements by themselves.

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