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Rule Fog Hunter

Lower Slaughter - Fog Hunter - Cotswolds

Lower Slaughter, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread1.9°C
Visibility24135 (Clear)
Relative Humidity88%
Wind Speed4.0m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Moderate Fog
Lower Slaughter
Sun, Apr 12 · 21:00–24:00 · 3h window
Medium confidence
40%
🌫️Fog Probability68.3-77.1%
Dewpoint Spread: 0.4°C
Visibility: 24135 (Clear)
Relative Humidity: 97%
Wind Speed: 3.2m/s (calm conditions)

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks morning mist and fog conditions that transform the Cotswolds' gentle landscapes into atmospheric scenes worthy of a Constable painting. We monitor temperature inversions, humidity levels, and overnight cooling to predict when valley fog will blanket the honey-stone villages and rolling hills.

The Cotswolds' distinctive topography of shallow river valleys creates perfect conditions for radiation fog and valley mist. Cold air pools in valleys overnight, and when combined with moisture from the River Windrush and its tributaries, creates dreamy morning conditions that soften the already pastoral landscape.

What makes Cotswolds fog photography special:

  • Slad Valley inversions - Laurie Lee's famous valley fills with morning mist, with hilltop villages emerging as islands above the fog layer
  • Arlington Row mist - Bibury's iconic weavers' cottages partially obscured by dawn fog, with honey-stone glowing through the haze
  • Valley villages - Bourton-on-the-Water and Lower Slaughter with fog settled along their streams, stone bridges emerging from mist
  • Church tower beacons - Stow-on-the-Wold and Painswick church towers rising above fog blankets, marking village locations

The best fog photography occurs on calm, clear autumn and winter mornings (September-March) following cold nights. Slad Valley—immortalized in Laurie Lee's "Cider with Rosie"—is particularly reliable for valley fog, with viewpoints along the valley rim offering elevated perspectives. Arlington Row benefits from mist rising from the River Coln, creating dreamy morning compositions of England's most photographed street. Arrive before dawn to capture the transition from pre-dawn blue light through foggy golden hour. Fog typically burns off by mid-morning, creating a narrow window of opportunity.

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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/London
Fog Probability
≥ 60.0%
Wed, Apr 8
08:000%
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Thu, Apr 9
24:000%
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Fri, Apr 10
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Sat, Apr 11
24:000%
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Sun, Apr 12
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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
Thu, Apr 9 Sunrise 06:24 Sunset 19:53
08:00
3% 9.1°C 0mm 88% 0cm 14° 11°C 0mm 0.15kPa 24135m 9.5m/s 4m/s
09:00
1% 9.5°C 0mm 85% 0cm 23° 12°C 0mm 0.21kPa 24135m 9.7m/s 4.4m/s
10:00
0% 8.6°C 0mm 77% 0cm 31° 13°C 0mm 0.33kPa 24134m 9.4m/s 5.3m/s
11:00
0% 6.7°C 0mm 67% 0cm 39° 13°C 0mm 0.48kPa 24135m 8.7m/s 6m/s
12:00
0% 8.2°C 0mm 72% 0cm 44° 13°C 0mm 0.43kPa 24134m 9.2m/s 6.5m/s
13:00
0% 10°C 0mm 78% 0cm 46° 14°C 0mm 0.35kPa 24134m 11m/s 7.7m/s
14:00
0% 9.5°C 0mm 83% 0cm 45° 12°C 0.06mm 0.24kPa 24135m 10m/s 7.6m/s
15:00
0% 8°C 0mm 79% 0cm 40° 12°C 0.06mm 0.28kPa 24135m 12m/s 7.8m/s
16:00
0% 6.5°C 0mm 77% 0cm 34° 10°C 0.13mm 0.29kPa 24135m 11m/s 8.5m/s
17:00
0% 4.7°C 0mm 76% 0cm 26° 8.6°C 0.19mm 0.26kPa 24134m 11m/s 7.4m/s
18:00
0% 4°C 0mm 74% 0cm 17° 8.3°C 0.19mm 0.29kPa 24135m 12m/s 7m/s
19:00
0% 3.4°C 0mm 76% 0cm 7.5° 7.4°C 0.19mm 0.25kPa 24135m 10m/s 6.8m/s
20:00
31% 2.1°C 0mm 77% 0cm -1.5° 5.9°C 0mm 0.22kPa 24135m 11m/s 6m/s
21:00
63% 1.1°C 0mm 75% 0cm -10° 5.2°C 0mm 0.22kPa 24135m 11m/s 5.2m/s
22:00
94% 0.3°C 0mm 76% 0cm -18° 4.1°C 0mm 0.2kPa 24134m 9.3m/s 4.1m/s
23:00
92% 0°C 0mm 80% 0cm -24° 3.1°C 0mm 0.15kPa 24134m 9.1m/s 4.2m/s
Fri, Apr 10 Sunrise 06:24 Sunset 19:53
24:00
89% -0.3°C 0mm 80% 0cm -28° 2.9°C 0mm 0.15kPa 24135m 11m/s 4.9m/s
01:00
87% -0.5°C 0mm 78% 0cm -30° 3°C 0mm 0.17kPa 24134m 9.9m/s 4.3m/s
02:00
59% -0.4°C 0mm 78% 0cm -29° 3°C 0mm 0.16kPa 24135m 8.5m/s 3.4m/s
03:00
31% -0.4°C 0mm 80% 0cm -26° 2.6°C 0mm 0.14kPa 24135m 8.6m/s 2.5m/s
04:00
3% -0.1°C 0mm 80% 0cm -20° 2.9°C 0mm 0.15kPa 24135m 9m/s 2.9m/s
05:00
2% 0.2°C 0mm 81% 0cm -12° 3.2°C 0mm 0.15kPa 24134m 7.2m/s 2.1m/s
06:00
1% 0.2°C 0mm 82% 0cm -4° 3°C 0mm 0.13kPa 24135m 1.3m/s 1.3m/s
07:00
0% 0.6°C 0mm 83% 0cm 5.1° 3.3°C 0mm 0.13kPa 24135m 0.91m/s 0.66m/s
08:00
0% 0.9°C 0mm 79% 0cm 14° 4.2°C 0mm 0.17kPa 24134m 1.5m/s 1.1m/s
09:00
0% 0.9°C 0mm 75% 0cm 23° 4.9°C 0mm 0.21kPa 24134m 0.4m/s 0.28m/s
10:00
0% 0.9°C 0mm 70% 0cm 32° 6.1°C 0mm 0.29kPa 24135m 1.9m/s 1.6m/s
11:00
0% 1.2°C 0mm 65% 0cm 39° 7.5°C 0mm 0.37kPa 24135m 3.8m/s 3m/s
12:00
0% 1.3°C 0mm 61% 0cm 44° 8.2°C 0mm 0.42kPa 24135m 5m/s 4.1m/s
13:00
0% 1.5°C 0mm 61% 0cm 46° 8.5°C 0mm 0.43kPa 24135m 5.5m/s 4.7m/s
14:00
0% 1.8°C 0mm 61% 0cm 45° 9°C 0mm 0.45kPa 24135m 5.7m/s 4.6m/s
15:00
0% 1.9°C 0mm 61% 0cm 41° 9°C 0mm 0.44kPa 24134m 6.1m/s 4.9m/s
16:00
0% 1.8°C 0mm 62% 0cm 34° 8.8°C 0mm 0.43kPa 24135m 6.6m/s 5.1m/s
17:00
0% 2.8°C 0mm 67% 0cm 26° 8.5°C 0.06mm 0.36kPa 24134m 6.8m/s 5.1m/s
18:00
0% 1.9°C 0mm 68% 0cm 17° 7.4°C 0.06mm 0.33kPa 24135m 8.1m/s 5.4m/s
19:00
0% 1.5°C 0mm 69% 0cm 7.8° 6.8°C 0.06mm 0.31kPa 24134m 10m/s 6m/s
20:00
1% 1.3°C 0mm 70% 0cm -1.2° 6.4°C 0mm 0.29kPa 24135m 11m/s 6.4m/s
21:00
2% 1.8°C 0mm 75% 0cm -10° 5.8°C 0mm 0.23kPa 24135m 13m/s 7.3m/s
22:00
3% 2.6°C 0mm 83% 0cm -18° 5.2°C 0mm 0.15kPa 24134m 15m/s 7.4m/s
23:00
3% 2.6°C 0mm 83% 0cm -24° 5.2°C 0mm 0.15kPa 24135m 19m/s 8.1m/s
Sat, Apr 11 Sunrise 06:22 Sunset 19:55
24:00
4% 2.6°C 0mm 76% 0cm -28° 6.5°C 0mm 0.23kPa 24135m 19m/s 9m/s
01:00
4% 2.9°C 0mm 76% 0cm -30° 6.9°C 0mm 0.24kPa 24134m 18m/s 9.2m/s
02:00
3% 4°C 0mm 81% 0cm -29° 7.1°C 0mm 0.2kPa 24135m 18m/s 9.1m/s
03:00
1% 5.1°C 0mm 83% 0cm -25° 7.8°C 0mm 0.18kPa 24134m 17m/s 8.2m/s
04:00
0% 5.8°C 0mm 84% 0cm -19° 8.2°C 0mm 0.17kPa 24135m 15m/s 6.7m/s
05:00
0% 6.7°C 0mm 85% 0cm -12° 9.1°C 0mm 0.18kPa 24134m 15m/s 7.1m/s
06:00
0% 6.8°C 0mm 86% 0cm -3.6° 9°C 0mm 0.16kPa 24135m 14m/s 7.3m/s
07:00
0% 6.9°C 0.01mm 87% 0cm 5.5° 9°C 0mm 0.15kPa 24135m 13m/s 6.8m/s
08:00
0% 7.4°C 0.36mm 89% 0cm 15° 9.1°C 0.13mm 0.12kPa 21910m 13m/s 6.9m/s
09:00
0% 3°C 0.54mm 95% 0cm 24° 3.8°C 1mm 0.04kPa 1787m 9.9m/s 7.6m/s
10:00
0% 2.6°C 0.03mm 97% 0cm 32° 3°C 1.2mm 0.02kPa 1177m 6.9m/s 4.5m/s
11:00
0% 1.8°C 0mm 98% 0cm 39° 2.1°C 1.2mm 0.01kPa 58m 6.9m/s 3.8m/s
12:00
0% 2.5°C 0mm 96% 0cm 44° 3.1°C 1.3mm 0.03kPa 149m 4.7m/s 2.9m/s
13:00
0% 3.2°C 0mm 92% 0cm 47° 4.4°C 1.3mm 0.07kPa 24134m 7.3m/s 3.2m/s
14:00
9% 2.8°C 0mm 87% 0cm 45° 4.8°C 0.88mm 0.11kPa 24134m 10m/s 5m/s
15:00
18% 2.5°C 0mm 83% 0cm 41° 5.1°C 0.44mm 0.15kPa 24135m 13m/s 6.7m/s
16:00
27% 2.1°C 0mm 79% 0cm 34° 5.5°C 0mm 0.19kPa 24135m 16m/s 8.4m/s
17:00
28% 2.6°C 0.003mm 79% 0cm 26° 5.9°C 0.02mm 0.2kPa 24135m 17m/s 9.1m/s
18:00
29% 3.1°C 0.007mm 79% 0cm 17° 6.4°C 0.04mm 0.2kPa 24135m 18m/s 9.9m/s
19:00
30% 3.6°C 0.01mm 80% 0cm 6.8°C 0.06mm 0.2kPa 24135m 19m/s 11m/s
20:00
42% 3.6°C 0.01mm 80% 0cm -0.89° 6.8°C 0.06mm 0.2kPa 24135m 18m/s 10m/s
21:00
54% 3.6°C 0.01mm 80% 0cm -9.7° 6.8°C 0.06mm 0.2kPa 24135m 17m/s 10m/s
22:00
66% 3.6°C 0.01mm 80% 0cm -17° 6.9°C 0.06mm 0.2kPa 24135m 16m/s 9.7m/s
23:00
64% 3.7°C 0.007mm 80% 0cm -24° 7°C 0.06mm 0.2kPa 24135m 16m/s 9.6m/s
Sun, Apr 12 Sunrise 06:19 Sunset 19:57
24:00
61% 3.9°C 0.003mm 80% 0cm -28° 7.1°C 0.06mm 0.2kPa 24135m 15m/s 9.5m/s
01:00
59% 4.1°C 0mm 80% 0cm -29° 7.2°C 0.06mm 0.2kPa 24135m 15m/s 9.4m/s
02:00
59% 4.5°C 0mm 80% 0cm -28° 7.7°C 0.1mm 0.21kPa 24135m 15m/s 9.3m/s
03:00
58% 4.9°C 0mm 79% 0cm -25° 8.2°C 0.15mm 0.22kPa 24135m 14m/s 9.3m/s
04:00
58% 5.3°C 0mm 79% 0cm -19° 8.7°C 0.19mm 0.24kPa 24135m 14m/s 9.2m/s
05:00
57% 5.2°C 0mm 78% 0cm -12° 8.8°C 0.44mm 0.25kPa 20651m 13m/s 8.8m/s
06:00
57% 5.1°C 0mm 77% 0cm -3.3° 8.8°C 0.69mm 0.26kPa 17166m 13m/s 8.3m/s
07:00
56% 4.9°C 0mm 76% 0cm 5.8° 8.8°C 0.94mm 0.27kPa 13682m 12m/s 7.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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