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Rule Fog Hunter

Grasmere - Fog Hunter - Lake District

Ambleside, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread0.2°C
Visibility211 (Fog)
Relative Humidity98%
Wind Speed4.6m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Dense Fog
Grasmere
Thu, Jun 11 · 10:00–20:00 · 10h window
High confidence
83%
🌫️Fog Probability96.2-100%
Dewpoint Spread: 0.2°C
Visibility: 81 (Dense fog)
Relative Humidity: 99%
Wind Speed: 1.3m/s (calm conditions)
fog weather icon
Dense Fog at Sunset
Grasmere
Thu, Jun 11 · 20:00–23:00
🌫️Fog Probability:79.7-91.1%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the conditions that create the Lake District's legendary atmospheric photography. We combine fog probability, dewpoint spread, visibility, and wind data to predict when and where mist will form over these famous lakes and valleys.

The Lake District's combination of lakes, tarns, and enclosed valleys creates ideal conditions for fog formation. Cool, calm nights allow mist to pool in valley bottoms, creating ethereal scenes at dawn that have inspired poets and photographers for centuries.

What makes the Lake District special for fog photography:

  • Lake mist - Cold water surfaces generate fog that pools over the lakes at dawn
  • Valley inversions - Mountain-ringed valleys trap mist while fells rise above
  • Romantic landscapes - This is Wordsworth and Turner country, with timeless views
  • Accessible locations - Well-maintained paths reach viewpoints above the fog layer

Peak fog season runs from late August through October, when temperature differentials are greatest. The best conditions typically occur on calm, clear nights when temperatures drop near dewpoint. Arrive before dawn—lake mist often lifts within an hour or two of sunrise. Higher viewpoints like Catbells or Loughrigg offer shots looking down at fog-filled valleys.

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 75.0%
Sun, Jun 7
03:0055%
04:0073%
05:0073%
06:0080%
07:00100%
08:0069%
09:0015%
10:0015%
11:000%
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13:000%
14:000%
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23:000%
Mon, Jun 8
24:000%
01:000%
02:000%
03:000%
04:000%
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06:000%
07:000%
08:000%
09:000%
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Tue, Jun 9
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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Wed, Jun 10
24:000%
01:000%
02:000%
03:000%
04:0030%
05:000%
06:000%
07:000%
08:000%
09:000%
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20:000%
21:000%
22:000%
23:000%
Thu, Jun 11
24:000%
01:000%
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
Mon, Jun 8 Sunrise 04:39 Sunset 21:43
03:00 ☾
0% 9.4°C 1.9mm 98% 0cm -9.2° 9.6°C 5.9mm 0.02kPa 211m 8.7m/s 4.6m/s
04:00 ☾
0% 8.2°C 0.64mm 95% 0cm -4.6° 9.1°C 7.1mm 0.06kPa 14423m 5.9m/s 2.2m/s
05:00
0% 7.8°C 1.2mm 97% 0cm 1.8° 8.3°C 8.4mm 0.03kPa 10335m 1.3m/s 1.2m/s
06:00
0% 7.7°C 0.08mm 97% 0cm 8.9° 8.2°C 8.8mm 0.03kPa 24135m 1.7m/s 1.4m/s
07:00
0% 7.6°C 0.02mm 96% 0cm 17° 8.3°C 9.1mm 0.04kPa 24134m 2.3m/s 1.5m/s
08:00
11% 6.9°C 0mm 87% 0cm 25° 8.9°C 0.06mm 0.15kPa 24135m 3.6m/s 1.9m/s
09:00
22% 6.4°C 0mm 79% 0cm 34° 9.9°C 0.06mm 0.26kPa 24134m 4.2m/s 2.2m/s
10:00
33% 6.4°C 0mm 76% 0cm 43° 10°C 0.19mm 0.3kPa 22167m 4.8m/s 3.3m/s
11:00
38% 6.4°C 0mm 76% 0cm 50° 10°C 0.31mm 0.3kPa 24135m 7.1m/s 5.8m/s
12:00
43% 6.3°C 0mm 74% 0cm 56° 11°C 0.44mm 0.34kPa 24135m 7.5m/s 6.2m/s
13:00
48% 5.4°C 0mm 68% 0cm 58° 11°C 0.5mm 0.43kPa 24134m 7.5m/s 6.3m/s
14:00
64% 5°C 0mm 66% 0cm 57° 11°C 0mm 0.45kPa 24134m 7.3m/s 6.4m/s
15:00
79% 4.9°C 0mm 65% 0cm 52° 11°C 0mm 0.46kPa 24134m 7.5m/s 6.5m/s
16:00
95% 4.9°C 0mm 66% 0cm 45° 11°C 0mm 0.45kPa 24135m 7.6m/s 6.2m/s
17:00
96% 5.2°C 0mm 68% 0cm 37° 11°C 0mm 0.42kPa 24134m 7.4m/s 5.9m/s
18:00
97% 5.8°C 0mm 73% 0cm 29° 10°C 0mm 0.34kPa 24134m 7.7m/s 6.2m/s
19:00
98% 6°C 0mm 77% 0cm 20° 9.7°C 0mm 0.27kPa 24134m 7.2m/s 4.2m/s
20:00
85% 6.4°C 0mm 82% 0cm 12° 9.3°C 0mm 0.21kPa 24134m 7.2m/s 2.7m/s
21:00
71% 5.8°C 0mm 88% 0cm 4.3° 7.6°C 0mm 0.12kPa 24134m 3.3m/s 2.6m/s
22:00 ☾
58% 5.4°C 0mm 93% 0cm -2.4° 6.5°C 0mm 0.07kPa 24135m 3m/s 2.7m/s
23:00 ☾
47% 5.5°C 0.01mm 93% 0cm -7.7° 6.6°C 0mm 0.07kPa 24135m 2.9m/s 2.6m/s
Tue, Jun 9 Sunrise 04:39 Sunset 21:43
24:00 ☾
35% 5.4°C 0mm 93% 0cm -11° 6.5°C 0mm 0.07kPa 24135m 2.8m/s 2.5m/s
01:00 ☾
24% 5.5°C 0.01mm 93% 0cm -13° 6.6°C 0.06mm 0.07kPa 24135m 4.3m/s 2.5m/s
02:00 ☾
17% 5.8°C 0.06mm 88% 0cm -12° 7.6°C 0.13mm 0.12kPa 23091m 8.8m/s 3m/s
03:00 ☾
11% 6.2°C 0.96mm 93% 0cm -9.1° 7.2°C 0.69mm 0.07kPa 9988m 8.1m/s 3m/s
04:00 ☾
4% 6.2°C 0mm 94% 0cm -4.5° 7.2°C 1.3mm 0.06kPa 13078m 8.9m/s 3.7m/s
05:00
4% 5.3°C 0mm 93% 0cm 1.9° 6.3°C 1.4mm 0.07kPa 24135m 9.8m/s 3.9m/s
06:00
5% 4.8°C 0mm 92% 0cm 8.9° 6°C 1.4mm 0.07kPa 24134m 9.5m/s 3m/s
07:00
5% 5.8°C 0mm 91% 0cm 17° 7.2°C 1.5mm 0.09kPa 24135m 8.9m/s 3.7m/s
08:00
14% 6.2°C 0mm 90% 0cm 26° 7.7°C 0.44mm 0.11kPa 19806m 9.6m/s 5.8m/s
09:00
24% 6.3°C 0mm 91% 0cm 34° 7.7°C 0.88mm 0.09kPa 20455m 10m/s 7m/s
10:00
33% 6.4°C 0mm 88% 0cm 43° 8.4°C 1.3mm 0.14kPa 20060m 11m/s 8m/s
11:00
23% 6°C 0mm 90% 0cm 50° 7.5°C 1.4mm 0.1kPa 22605m 9.5m/s 5.4m/s
12:00
14% 6.7°C 0mm 92% 0cm 56° 8°C 1.9mm 0.09kPa 11923m 10m/s 7.3m/s
13:00
4% 7.1°C 0mm 87% 0cm 58° 9.1°C 2.4mm 0.15kPa 13546m 12m/s 8.8m/s
14:00
12% 7.3°C 0mm 88% 0cm 57° 9.1°C 0.44mm 0.14kPa 15113m 13m/s 8.6m/s
15:00
19% 7.3°C 0mm 87% 0cm 53° 9.4°C 0.81mm 0.15kPa 18075m 14m/s 9m/s
16:00
27% 7.3°C 0mm 83% 0cm 46° 10°C 1.1mm 0.21kPa 22875m 14m/s 9.6m/s
17:00
28% 6.7°C 0mm 78% 0cm 37° 10°C 1.3mm 0.27kPa 24134m 14m/s 9.1m/s
18:00
29% 6.3°C 0mm 76% 0cm 29° 10°C 1.3mm 0.31kPa 24135m 12m/s 7.7m/s
19:00
30% 5.9°C 0mm 76% 0cm 20° 9.9°C 1.3mm 0.29kPa 24134m 11m/s 5.7m/s
20:00
31% 5.3°C 0mm 78% 0cm 12° 9°C 0mm 0.26kPa 24134m 9.1m/s 3.7m/s
21:00
33% 4.5°C 0mm 83% 0cm 4.4° 7.2°C 0mm 0.17kPa 24134m 1.8m/s 1.9m/s
22:00 ☾
34% 4°C 0mm 84% 0cm -2.3° 6.5°C 0mm 0.16kPa 24135m 1.7m/s 1.8m/s
23:00 ☾
27% 3.9°C 0mm 87% 0cm -7.6° 5.9°C 0mm 0.12kPa 24134m 1.5m/s 1.6m/s
Wed, Jun 10 Sunrise 04:38 Sunset 21:44
24:00 ☾
21% 3.9°C 0mm 87% 0cm -11° 5.8°C 0mm 0.12kPa 24135m 1.6m/s 1.7m/s
01:00 ☾
14% 3.9°C 0mm 89% 0cm -13° 5.6°C 0mm 0.1kPa 24135m 1.6m/s 1.6m/s
02:00 ☾
12% 4.1°C 0mm 89% 0cm -12° 5.8°C 0mm 0.1kPa 24134m 1.6m/s 1.7m/s
03:00 ☾
11% 5°C 0.36mm 88% 0cm -9.1° 6.7°C 0.13mm 0.11kPa 20634m 2.1m/s 1.7m/s
04:00 ☾
9% 5.9°C 0.66mm 96% 0cm -4.4° 6.4°C 0.94mm 0.04kPa 13511m 1.8m/s 1.5m/s
05:00
8% 6°C 0mm 96% 0cm 1.9° 6.6°C 1.3mm 0.04kPa 24134m 1.5m/s 1.4m/s
06:00
7% 5.9°C 0mm 95% 0cm 9° 6.7°C 1.4mm 0.05kPa 24135m 1.7m/s 1.5m/s
07:00
6% 5.7°C 0.24mm 89% 0cm 17° 7.4°C 1.6mm 0.11kPa 21642m 5m/s 1.8m/s
08:00
7% 5.9°C 0.18mm 84% 0cm 26° 8.5°C 1.3mm 0.18kPa 22473m 6.3m/s 3.6m/s
09:00
7% 6.1°C 0.12mm 78% 0cm 34° 9.7°C 1mm 0.26kPa 23304m 7.6m/s 5.3m/s
10:00
8% 6.2°C 0.06mm 73% 0cm 43° 11°C 0.75mm 0.35kPa 24135m 8.9m/s 7.1m/s
11:00
6% 6.4°C 0.04mm 75% 0cm 50° 11°C 0.79mm 0.32kPa 24135m 9.1m/s 6.8m/s
12:00
4% 6.6°C 0.03mm 77% 0cm 56° 10°C 0.83mm 0.29kPa 24135m 9.2m/s 6.6m/s
13:00
2% 6.7°C 0.01mm 79% 0cm 59° 10°C 0.88mm 0.26kPa 24135m 9.4m/s 6.3m/s
14:00
12% 5.9°C 0.007mm 83% 0cm 57° 8.7°C 0.58mm 0.19kPa 24135m 6.9m/s 4.9m/s
15:00
21% 5.1°C 0.003mm 86% 0cm 53° 7.2°C 0.29mm 0.14kPa 24135m 4.4m/s 3.4m/s
16:00
31% 4.2°C 0mm 90% 0cm 46° 5.8°C 0mm 0.09kPa 24135m 1.8m/s 2m/s
17:00
31% 4.1°C 0mm 91% 0cm 38° 5.5°C 0mm 0.08kPa 24135m 1.7m/s 1.8m/s
18:00
30% 4°C 0mm 92% 0cm 29° 5.2°C 0mm 0.07kPa 24135m 1.5m/s 1.6m/s
19:00
30% 3.9°C 0mm 94% 0cm 20° 4.9°C 0mm 0.06kPa 24135m 1.3m/s 1.4m/s
20:00
35% 4.3°C 0mm 94% 0cm 12° 5.2°C 0mm 0.05kPa 24135m 1.7m/s 1.7m/s
21:00
39% 4.7°C 0mm 94% 0cm 4.4° 5.6°C 0mm 0.05kPa 24135m 2.2m/s 2m/s
22:00 ☾
44% 5.1°C 0mm 95% 0cm -2.2° 5.9°C 0mm 0.05kPa 24135m 2.6m/s 2.4m/s
23:00 ☾
40% 5.7°C 0.01mm 94% 0cm -7.5° 6.6°C 0mm 0.06kPa 24135m 3m/s 2.5m/s
Thu, Jun 11 Sunrise 04:38 Sunset 21:44
24:00 ☾
36% 6.3°C 0.03mm 93% 0cm -11° 7.3°C 0mm 0.07kPa 24135m 3.3m/s 2.6m/s
01:00 ☾
32% 6.8°C 0.04mm 93% 0cm -12° 8°C 0mm 0.08kPa 24135m 3.6m/s 2.7m/s
02:00 ☾
26% 7.5°C 0.14mm 94% 0cm -12° 8.3°C 0.27mm 0.06kPa 16205m 4.5m/s 2.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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