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Rule Fog Hunter

Bourton-on-the-Water - Fog Hunter - Cotswolds

Bourton on the Water, England, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread5.3°C
Visibility24134 (Clear)
Relative Humidity69%
Wind Speed3.1m/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
Bourton-on-the-Water
Tomorrow · 24:00–04:00 · 4h window
Medium confidence
68%
🌫️Fog Probability67.2-92.2%
Dewpoint Spread: 0.1°C
Visibility: 8898 (Moderate)
Relative Humidity: 99%
Wind Speed: 2.6m/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
4matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Sun, Apr 19
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%
Mon, Apr 20
24:000%
01:000%
02:0043%
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%
22:0032%
23:0044%
Tue, Apr 21
24:0067%
01:0088%
02:0092%
03:0087%
04:0028%
05:0033%
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%
Wed, Apr 22
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:0035%
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%
22:0050%
23:0050%
Thu, Apr 23
24:0050%
01:0038%
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
Mon, Apr 20 Sunrise 06:00 Sunset 20:12
09:00
55% 1.6°C 0mm 69% 0cm 27° 6.9°C 0mm 0.31kPa 24134m 4.5m/s 3.1m/s
10:00
62% 2.1°C 0mm 64% 0cm 35° 8.5°C 0mm 0.4kPa 24135m 4.6m/s 3.5m/s
11:00
62% 2.5°C 0mm 61% 0cm 42° 9.7°C 0mm 0.47kPa 24135m 4.4m/s 3.8m/s
12:00
63% 3°C 0mm 60% 0cm 48° 10°C 0mm 0.5kPa 24134m 4.4m/s 3.8m/s
13:00
63% 3.4°C 0mm 59% 0cm 50° 11°C 0.06mm 0.53kPa 24135m 4.5m/s 4m/s
14:00
52% 3.1°C 0mm 61% 0cm 48° 10°C 0.06mm 0.48kPa 24134m 5m/s 4.5m/s
15:00
42% 4.3°C 0mm 70% 0cm 44° 9.5°C 0.06mm 0.35kPa 24135m 5.5m/s 4m/s
16:00
31% 4.2°C 0mm 68% 0cm 37° 9.8°C 0.13mm 0.39kPa 24134m 5.6m/s 4.9m/s
17:00
30% 4.2°C 0mm 71% 0cm 28° 9.2°C 0.13mm 0.34kPa 24134m 5.7m/s 4.3m/s
18:00
29% 4.7°C 0mm 74% 0cm 19° 9°C 0.13mm 0.29kPa 24135m 5.9m/s 3.2m/s
19:00
28% 4.8°C 0mm 77% 0cm 10° 8.6°C 0.19mm 0.26kPa 24134m 6.6m/s 3.6m/s
20:00
46% 3.9°C 0mm 86% 0cm 1.4° 6.1°C 0mm 0.13kPa 24135m 6.7m/s 3.1m/s
21:00
63% 3.1°C 0mm 92% 0cm -7.3° 4.3°C 0mm 0.07kPa 24134m 9.2m/s 3.2m/s
22:00
81% 2.3°C 0mm 94% 0cm -15° 3.2°C 0mm 0.05kPa 24135m 11m/s 3m/s
23:00
85% 1.9°C 0mm 96% 0cm -21° 2.5°C 0mm 0.03kPa 24135m 9.9m/s 3m/s
Tue, Apr 21 Sunrise 06:00 Sunset 20:12
24:00
90% 1.9°C 0mm 98% 0cm -25° 2.3°C 0mm 0.02kPa 24134m 10m/s 2.9m/s
01:00
94% 1.9°C 0mm 99% 0cm -26° 2.1°C 0mm 0.01kPa 20270m 9.3m/s 2.7m/s
02:00
91% 1.7°C 0mm 99% 0cm -25° 1.8°C 0mm 0kPa 8898m 8.3m/s 2.6m/s
03:00
88% 2.5°C 0mm 99% 0cm -22° 2.7°C 0mm 0.01kPa 335m 9.3m/s 3.7m/s
04:00
85% 3°C 0mm 96% 0cm -16° 3.6°C 0mm 0.03kPa 10381m 11m/s 4.9m/s
05:00
80% 3.7°C 0mm 96% 0cm -8.8° 4.3°C 0mm 0.03kPa 9740m 10m/s 4.7m/s
06:00
75% 3.7°C 0mm 93% 0cm 0.04° 4.8°C 0mm 0.06kPa 24134m 11m/s 5.6m/s
07:00
70% 3.7°C 0mm 93% 0cm 8.5° 4.7°C 0mm 0.06kPa 24134m 11m/s 4.8m/s
08:00
67% 3.6°C 0mm 90% 0cm 18° 5°C 0mm 0.09kPa 24135m 11m/s 5.7m/s
09:00
65% 3.9°C 0mm 81% 0cm 27° 7°C 0mm 0.19kPa 24134m 10m/s 6.8m/s
10:00
62% 3°C 0mm 70% 0cm 35° 8.1°C 0mm 0.33kPa 24135m 9.4m/s 7.4m/s
11:00
56% 3°C 0mm 64% 0cm 43° 9.4°C 0mm 0.42kPa 24134m 9.4m/s 7.6m/s
12:00
49% 3.3°C 0mm 62% 0cm 48° 10°C 0mm 0.48kPa 24134m 9.2m/s 7.5m/s
13:00
43% 3.8°C 0mm 61% 0cm 50° 11°C 0mm 0.52kPa 20269m 9.2m/s 7.4m/s
14:00
42% 5.2°C 0mm 71% 0cm 49° 10°C 0mm 0.35kPa 24134m 9.3m/s 6.7m/s
15:00
41% 3.6°C 0mm 58% 0cm 44° 12°C 0mm 0.58kPa 24135m 10m/s 7.5m/s
16:00
40% 5.4°C 0mm 63% 0cm 37° 12°C 0mm 0.54kPa 24134m 10m/s 8.2m/s
17:00
43% 5.4°C 0mm 66% 0cm 29° 12°C 0mm 0.47kPa 24134m 10m/s 8.3m/s
18:00
47% 4.6°C 0mm 67% 0cm 20° 10°C 0mm 0.41kPa 24134m 11m/s 7.8m/s
19:00
50% 3.2°C 0mm 68% 0cm 10° 8.7°C 0mm 0.36kPa 24134m 12m/s 7.4m/s
20:00
61% 1.3°C 0mm 67% 0cm 1.6° 7°C 0mm 0.33kPa 24134m 13m/s 7.3m/s
21:00
73% 0.6°C 0mm 69% 0cm -7.1° 5.9°C 0mm 0.29kPa 24135m 14m/s 6.9m/s
22:00
84% 1.3°C 0mm 77% 0cm -15° 4.9°C 0mm 0.2kPa 24135m 15m/s 7.2m/s
23:00
86% 1.4°C 0mm 83% 0cm -20° 4°C 0mm 0.14kPa 24135m 15m/s 6.7m/s
Wed, Apr 22 Sunrise 05:58 Sunset 20:14
24:00
88% 1.3°C 0mm 86% 0cm -24° 3.4°C 0mm 0.11kPa 24134m 15m/s 6.3m/s
01:00
90% 1.3°C 0mm 89% 0cm -26° 2.9°C 0mm 0.08kPa 24135m 15m/s 6m/s
02:00
91% 1.5°C 0mm 92% 0cm -25° 2.6°C 0mm 0.06kPa 24135m 15m/s 5.9m/s
03:00
91% 1.7°C 0mm 94% 0cm -21° 2.6°C 0mm 0.04kPa 24135m 15m/s 6.4m/s
04:00
92% 2°C 0mm 95% 0cm -16° 2.7°C 0mm 0.04kPa 24134m 15m/s 6.2m/s
05:00
91% 2.1°C 0mm 96% 0cm -8.5° 2.7°C 0mm 0.03kPa 24135m 15m/s 5.7m/s
06:00
89% 2.2°C 0mm 96% 0cm 0.29° 2.7°C 0mm 0.03kPa 24134m 14m/s 5.2m/s
07:00
88% 2.6°C 0mm 94% 0cm 8.8° 3.5°C 0mm 0.05kPa 24134m 15m/s 6.2m/s
08:00
85% 3.6°C 0mm 86% 0cm 18° 5.8°C 0mm 0.13kPa 24135m 14m/s 6.5m/s
09:00
82% 3.9°C 0mm 76% 0cm 27° 7.8°C 0mm 0.25kPa 24135m 13m/s 7.5m/s
10:00
79% 4°C 0mm 69% 0cm 36° 9.3°C 0mm 0.36kPa 24135m 11m/s 7.8m/s
11:00
78% 4.2°C 0mm 65% 0cm 43° 10°C 0mm 0.44kPa 24135m 11m/s 7.9m/s
12:00
78% 4.5°C 0mm 62% 0cm 48° 11°C 0mm 0.51kPa 24134m 11m/s 7.9m/s
13:00
77% 4.8°C 0mm 60% 0cm 50° 12°C 0mm 0.58kPa 24135m 10m/s 7.9m/s
14:00
77% 3.5°C 0mm 63% 0cm 49° 10°C 0mm 0.47kPa 24135m 11m/s 7m/s
15:00
77% 2.2°C 0mm 66% 0cm 44° 8.2°C 0mm 0.38kPa 24135m 13m/s 6.2m/s
16:00
77% 0.8°C 0mm 68% 0cm 37° 6.2°C 0mm 0.3kPa 24135m 14m/s 5.3m/s
17:00
76% 1°C 0mm 75% 0cm 29° 5.1°C 0mm 0.22kPa 24135m 12m/s 4.7m/s
18:00
75% 1.1°C 0mm 81% 0cm 20° 4°C 0mm 0.15kPa 24135m 10m/s 4.1m/s
19:00
74% 1.1°C 0mm 88% 0cm 11° 2.9°C 0mm 0.09kPa 24135m 8.5m/s 3.5m/s
20:00
75% 1°C 0mm 90% 0cm 1.9° 2.4°C 0mm 0.07kPa 24135m 7.7m/s 3.3m/s
21:00
75% 0.9°C 0mm 93% 0cm -6.8° 2°C 0mm 0.05kPa 24135m 6.9m/s 3.1m/s
22:00
76% 0.8°C 0mm 95% 0cm -14° 1.5°C 0mm 0.03kPa 24135m 6m/s 2.9m/s
23:00
76% 0.9°C 0mm 95% 0cm -20° 1.6°C 0mm 0.03kPa 24135m 6.8m/s 2.8m/s
Thu, Apr 23 Sunrise 05:56 Sunset 20:16
24:00
75% 1°C 0mm 95% 0cm -24° 1.7°C 0mm 0.03kPa 24135m 7.5m/s 2.7m/s
01:00
75% 1.1°C 0mm 95% 0cm -26° 1.8°C 0mm 0.03kPa 24135m 8.2m/s 2.6m/s
02:00
70% 2.3°C 0mm 87% 0cm -25° 4.4°C 0mm 0.11kPa 24135m 8.1m/s 3.5m/s
03:00
64% 3.4°C 0mm 78% 0cm -21° 7°C 0mm 0.22kPa 24135m 7.9m/s 4.4m/s
04:00
59% 4.3°C 0mm 70% 0cm -15° 9.5°C 0mm 0.36kPa 24135m 7.8m/s 5.3m/s
05:00
55% 4.5°C 0mm 65% 0cm -8.2° 11°C 0mm 0.46kPa 24135m 7.7m/s 5.5m/s
06:00
50% 4.5°C 0mm 59% 0cm 0.54° 12°C 0mm 0.57kPa 24135m 7.6m/s 5.7m/s
07:00
46% 4.3°C 0mm 54% 0cm 9.1° 13°C 0mm 0.71kPa 24135m 7.5m/s 6m/s
08:00
46% 4.7°C 0mm 54% 0cm 18° 14°C 0mm 0.72kPa 24135m 7.5m/s 6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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