Skip to content
PhotoWeather
Get started
More Fog Hunter in Snowdonia (Eryri)
Create your own alerts
Rule Fog Hunter

Rhinog Fawr - Fog Hunter - Snowdonia (Eryri)

Harlech, Wales, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

No opportunities right now
Here’s what usually blocks matches

No Fog Hunter opportunities in the next 14 days

Get notified
Free alerts · takes 30 seconds
Rule requirements (key thresholds)
Fog Probability · ≥ 75.0%

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Fog Probability 100% failing

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread7.4°C
Visibility24135 (Clear)
Relative Humidity63%
Wind Speed1.7m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks when valley inversions and mountain mist create atmospheric conditions for photography in Snowdonia's glacial valleys. We monitor temperature inversions, humidity patterns, and wind conditions to predict optimal fog photography opportunities.

Snowdonia's deep glacial valleys—Nant Gwynant, Llanberis Pass, and Ogwen Valley—act as natural fog bowls where cold air settles overnight, creating spectacular valley inversions with mountain peaks rising through cloud seas. The region's high rainfall and numerous lakes add moisture to the atmosphere, producing frequent mist conditions that transform slate landscapes and mountain tarns into ethereal scenes.

What makes Snowdonia fog photography distinctive:

  • Valley inversions - Nant Gwynant and Ogwen Valley trap cold air, creating cloud seas with peaks emerging above
  • Lake mist - Llyn Padarn and Llyn Ogwen generate morning mist that drifts across mirror-still water
  • Slate atmosphere - Historic slate quarries at Llanberis create moody industrial landscapes in fog
  • Glacial cwms - Cwm Idwal's enclosed cirque traps mist, creating atmospheric waterfall scenes at Devil's Kitchen

The most reliable fog conditions occur during settled high-pressure periods in autumn and winter (September-February) when clear skies allow overnight cooling to create temperature inversions. Nant Gwynant valley is particularly prone to inversions—position yourself at higher viewpoints like Pen-y-Gwryd or along the A498 to capture peaks rising through cloud. Llyn Padarn generates morning mist that drifts past Dolbadarn Castle's tower, creating atmospheric castle scenes. Cwm Idwal's enclosed glacial bowl traps mist against the dramatic headwall of Devil's Kitchen. The timing is critical—arrive before dawn as mist typically burns off within an hour or two of sunrise. Wales's wet climate means fog is common, but our forecast identifies the photogenic conditions when visibility is just right—not too thick to lose definition, not too thin to lack atmosphere.

Create your own Fog Hunter alerts

Get notified when these conditions match at your own locations.

Get this template

72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 75.0%
Wed, Jul 8
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Thu, Jul 9
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Fri, Jul 10
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sat, Jul 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
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/London
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
Wed, Jul 8 Sunrise 05:02 Sunset 21:40
15:00
100% 14°C 0mm 63% 0cm 54° 21°C 0mm 0.92kPa 24135m 2.1m/s 1.7m/s
16:00
100% 14°C 0mm 64% 0cm 47° 21°C 0mm 0.87kPa 24135m 2.1m/s 1.7m/s
17:00
100% 14°C 0mm 67% 0cm 39° 20°C 0mm 0.78kPa 24135m 2.2m/s 2m/s
18:00
99% 14°C 0mm 72% 0cm 30° 19°C 0mm 0.64kPa 24135m 1.9m/s 1.8m/s
19:00
99% 14°C 0mm 76% 0cm 21° 19°C 0mm 0.51kPa 24134m 1.6m/s 1.3m/s
20:00
97% 15°C 0mm 82% 0cm 12° 18°C 0mm 0.37kPa 24134m 0.9m/s 0.73m/s
21:00
95% 14°C 0mm 86% 0cm 4.3° 17°C 0mm 0.26kPa 24134m 0.83m/s 0.69m/s
22:00 ☾
93% 14°C 0mm 88% 0cm -2.9° 15°C 0mm 0.2kPa 24135m 0.61m/s 0.61m/s
23:00 ☾
95% 13°C 0mm 89% 0cm -8.7° 15°C 0mm 0.19kPa 24134m 0.61m/s 0.64m/s
Thu, Jul 9 Sunrise 05:02 Sunset 21:40
24:00 ☾
97% 13°C 0mm 89% 0cm -13° 15°C 0mm 0.18kPa 24134m 0.41m/s 0.45m/s
01:00 ☾
99% 13°C 0mm 89% 0cm -15° 14°C 0mm 0.18kPa 24135m 0.81m/s 0.82m/s
02:00 ☾
99% 13°C 0mm 89% 0cm -14° 14°C 0mm 0.18kPa 24135m 1m/s 1m/s
03:00 ☾
100% 12°C 0mm 89% 0cm -12° 14°C 0mm 0.18kPa 24135m 1m/s 1.1m/s
04:00 ☾
100% 12°C 0mm 89% 0cm -7.3° 14°C 0mm 0.18kPa 24134m 0.9m/s 0.84m/s
05:00 ☾
100% 12°C 0mm 89% 0cm -0.88° 14°C 0mm 0.18kPa 24134m 1m/s 1.1m/s
06:00
100% 12°C 0mm 87% 0cm 6.4° 14°C 0mm 0.2kPa 24134m 1.2m/s 1.3m/s
07:00
100% 13°C 0mm 84% 0cm 15° 16°C 0mm 0.28kPa 24135m 0.81m/s 0.79m/s
08:00
100% 14°C 0mm 80% 0cm 23° 17°C 0mm 0.4kPa 24135m 0.71m/s 0.61m/s
09:00
100% 14°C 0mm 76% 0cm 32° 18°C 0mm 0.51kPa 24134m 0.82m/s 0.92m/s
10:00
100% 15°C 0mm 73% 0cm 41° 19°C 0mm 0.61kPa 24135m 1.3m/s 1.5m/s
11:00
100% 15°C 0mm 72% 0cm 49° 20°C 0mm 0.64kPa 24134m 1.6m/s 2m/s
12:00
100% 16°C 0mm 74% 0cm 56° 20°C 0mm 0.64kPa 24135m 1.7m/s 2.1m/s
13:00
100% 16°C 0mm 74% 0cm 59° 21°C 0mm 0.65kPa 24135m 1.8m/s 2.3m/s
14:00
100% 16°C 0mm 72% 0cm 59° 21°C 0mm 0.7kPa 24134m 1.9m/s 2.5m/s
15:00
100% 16°C 0mm 71% 0cm 54° 22°C 0mm 0.75kPa 24135m 2.1m/s 2.5m/s
16:00
100% 16°C 0mm 71% 0cm 47° 22°C 0mm 0.75kPa 24135m 2.2m/s 2.7m/s
17:00
99% 17°C 0mm 72% 0cm 39° 22°C 0mm 0.72kPa 24134m 2.3m/s 2.5m/s
18:00
97% 17°C 0mm 74% 0cm 30° 21°C 0mm 0.65kPa 24135m 2.5m/s 2.2m/s
19:00
96% 17°C 0mm 78% 0cm 21° 21°C 0mm 0.56kPa 24135m 2.5m/s 1.9m/s
20:00
95% 18°C 0mm 84% 0cm 12° 20°C 0mm 0.39kPa 24134m 2.3m/s 1.7m/s
21:00
93% 17°C 0mm 88% 0cm 4.2° 19°C 0mm 0.26kPa 24135m 2.1m/s 2.2m/s
22:00 ☾
92% 16°C 0mm 91% 0cm -3° 18°C 0mm 0.19kPa 24135m 2.3m/s 2.5m/s
23:00 ☾
91% 15°C 0mm 89% 0cm -8.8° 17°C 0mm 0.21kPa 24135m 2.6m/s 2.8m/s
Fri, Jul 10 Sunrise 05:03 Sunset 21:39
24:00 ☾
91% 13°C 0mm 83% 0cm -13° 16°C 0mm 0.31kPa 24135m 2.6m/s 2.8m/s
01:00 ☾
90% 12°C 0mm 78% 0cm -15° 16°C 0mm 0.4kPa 24135m 3.6m/s 3.3m/s
02:00 ☾
89% 11°C 0mm 74% 0cm -14° 15°C 0mm 0.46kPa 24135m 3.7m/s 3.6m/s
03:00 ☾
88% 11°C 0mm 73% 0cm -12° 15°C 0mm 0.46kPa 24135m 3.5m/s 3.5m/s
04:00 ☾
87% 10°C 0mm 74% 0cm -7.4° 15°C 0mm 0.45kPa 24134m 2.6m/s 3m/s
05:00 ☾
84% 10°C 0mm 73% 0cm -1° 15°C 0mm 0.47kPa 24135m 2.7m/s 3m/s
06:00
81% 11°C 0mm 74% 0cm 6.2° 15°C 0mm 0.46kPa 24134m 2.7m/s 3m/s
07:00
78% 12°C 0mm 73% 0cm 14° 17°C 0mm 0.51kPa 24135m 3.1m/s 2.9m/s
08:00
57% 14°C 0mm 71% 0cm 23° 19°C 0mm 0.64kPa 24134m 2.9m/s 2.5m/s
09:00
37% 13°C 0mm 62% 0cm 32° 21°C 0mm 0.94kPa 24134m 2.2m/s 1.7m/s
10:00
16% 14°C 0mm 58% 0cm 41° 22°C 0mm 1.1kPa 24135m 1.6m/s 0.9m/s
11:00
14% 14°C 0mm 56% 0cm 49° 23°C 0mm 1.3kPa 24134m 1.6m/s 0.6m/s
12:00
12% 15°C 0mm 54% 0cm 56° 25°C 0mm 1.4kPa 24134m 1.5m/s 0.97m/s
13:00
10% 15°C 0mm 55% 0cm 59° 25°C 0mm 1.4kPa 24134m 1.8m/s 1.8m/s
14:00
20% 16°C 0mm 55% 0cm 58° 25°C 0mm 1.4kPa 24135m 2m/s 2.3m/s
15:00
30% 16°C 0mm 56% 0cm 54° 25°C 0mm 1.4kPa 24134m 2.2m/s 2.6m/s
16:00
40% 17°C 0mm 59% 0cm 47° 25°C 0mm 1.3kPa 24134m 2.3m/s 2.5m/s
17:00
39% 17°C 0mm 63% 0cm 39° 25°C 0mm 1.2kPa 24135m 2.5m/s 2.3m/s
18:00
38% 18°C 0mm 68% 0cm 30° 25°C 0mm 0.99kPa 24135m 2.8m/s 2.3m/s
19:00
37% 19°C 0mm 74% 0cm 21° 24°C 0mm 0.77kPa 24135m 4.1m/s 3.1m/s
20:00
36% 18°C 0mm 80% 0cm 12° 21°C 0.08mm 0.5kPa 24135m 3.5m/s 2.9m/s
21:00
36% 16°C 0mm 86% 0cm 4.1° 18°C 0.17mm 0.29kPa 24135m 3m/s 2.8m/s
22:00 ☾
35% 14°C 0mm 92% 0cm -3.1° 15°C 0.25mm 0.14kPa 24135m 2.4m/s 2.7m/s
23:00 ☾
33% 14°C 0mm 91% 0cm -8.9° 16°C 0.29mm 0.16kPa 24135m 2.4m/s 2.6m/s
Sat, Jul 11 Sunrise 05:04 Sunset 21:38
24:00 ☾
31% 15°C 0mm 90% 0cm -13° 16°C 0.33mm 0.18kPa 24135m 2.4m/s 2.4m/s
01:00 ☾
29% 15°C 0mm 90% 0cm -15° 17°C 0.38mm 0.2kPa 24135m 2.3m/s 2.3m/s
02:00 ☾
34% 15°C 0mm 85% 0cm -15° 18°C 0.27mm 0.31kPa 24135m 2.4m/s 2.2m/s
03:00 ☾
40% 16°C 0mm 80% 0cm -12° 19°C 0.17mm 0.45kPa 24135m 2.5m/s 2.2m/s
04:00 ☾
45% 16°C 0mm 75% 0cm -7.5° 21°C 0.06mm 0.61kPa 24135m 2.6m/s 2.1m/s
05:00 ☾
44% 16°C 0mm 70% 0cm -1.2° 22°C 0.06mm 0.77kPa 24135m 3.1m/s 2.5m/s
06:00
42% 16°C 0mm 66% 0cm 6.1° 23°C 0.06mm 0.95kPa 24135m 3.6m/s 2.8m/s
07:00
41% 16°C 0mm 62% 0cm 14° 24°C 0.06mm 1.1kPa 24135m 4.1m/s 3.2m/s
08:00
41% 16°C 0mm 61% 0cm 23° 24°C 0.13mm 1.2kPa 24135m 4.3m/s 3.3m/s
09:00
41% 17°C 0mm 61% 0cm 32° 25°C 0.19mm 1.2kPa 24135m 4.4m/s 3.5m/s
10:00
41% 17°C 0mm 61% 0cm 41° 25°C 0.25mm 1.2kPa 24135m 4.5m/s 3.6m/s
11:00
41% 17°C 0.02mm 69% 0cm 49° 23°C 0.54mm 0.89kPa 24135m 5.1m/s 3.9m/s
12:00
42% 17°C 0.04mm 77% 0cm 55° 21°C 0.83mm 0.59kPa 24135m 5.6m/s 4.3m/s
13:00
42% 17°C 0.06mm 85% 0cm 59° 20°C 1.1mm 0.35kPa 24135m 6.1m/s 4.6m/s
14:00
43% 17°C 0.04mm 87% 0cm 58° 19°C 0.9mm 0.28kPa 24135m 6m/s 4.3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

Get Notified of Opportunities

Create your own custom alerts for this location and more.

Create Free Account