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Rule Blue Hour

Kimmeridge Bay - Blue Hour - Dorset & Jurassic Coast

Wareham, England, United Kingdom

When city lights balance with the deep blue twilight sky

Currently

Real-time conditions
Cloud Cover34%
Moon Altitude51.6°

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
blue-hour weather icon
Next opportunity
Good Blue Hour (clear) at Sunrise
Kimmeridge Bay
Tomorrow · 05:24–05:37 · 1h window
Medium confidence
66%
🌉Blue Hour Quality68.7%
Cloud Cover: 5%
Moon Illumination: 32%
Moon Altitude: -11.2°
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Kimmeridge Bay
Thu, Apr 23 · 05:21–05:35
🌉Blue Hour Quality:70%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunset
Kimmeridge Bay
Thu, Apr 23 · 20:38–20:52
🌉Blue Hour Quality:71.4%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Kimmeridge Bay
Tue, Apr 28 · 05:11–05:25
🌉Blue Hour Quality:67%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks twilight conditions that transform the Jurassic Coast's landmarks into atmospheric scenes. We combine cloud cover, visibility, and twilight timing to predict optimal blue hour opportunities for lighthouse photography, natural arch silhouettes, and coastal twilight compositions.

The Jurassic Coast's dramatic geology creates powerful silhouettes during blue hour, while Portland Bill lighthouse provides one of Britain's finest twilight lighthouse compositions. The clean marine atmosphere along this coast often produces clear twilight skies with rich color gradients.

What makes the Jurassic Coast special for blue-hour photography:

  • Portland Bill - Red-and-white striped lighthouse beam cutting through dusk, dramatic tidal race visible below
  • Durdle Door - Limestone arch silhouetted against colorful twilight, long exposures smooth the sea
  • Swanage Pier - Victorian pier lights reflecting in calm bay water, Purbeck Hills backdrop
  • Old Harry Rocks - Chalk sea stacks profiled against eastern twilight glow

Portland Bill lighthouse offers Britain's finest lighthouse blue hour composition—the distinctive red-and-white striped tower sends its beam across darkening waters while the tidal race creates texture below. The lighthouse is accessible year-round, with the visitor center providing context. Durdle Door becomes a dramatic silhouette during blue hour—the arch perfectly frames remaining light on the western horizon. Long exposures smooth the sea into misty layers around the limestone. Swanage's Victorian pier with its period lighting creates nostalgic twilight compositions, with lights reflecting in the bay. Lulworth Cove takes on serene quality at twilight, with limestone cliffs darkening as the sky retains color. The timing requires planning—arrive well before sunset to compose, then shoot through the 20-30 minute blue hour window when artificial and natural light balance. Spring and autumn offer the most colorful twilights, while winter's earlier blue hour means shooting in milder conditions.

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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
Blue Hour
Any
Blue Hour Quality
≥ 65.0%
Precipitation Chance
≤ 15.0%
Mon, Apr 20
20:0064%0%
21:0063%0%
22:0026%0%
23:0025%0%
Tue, Apr 21
24:0026%0%
01:0029%0%
02:0028%0%
03:0026%0%
04:0026%0%
05:0067%13%
06:0027%26%
07:0018%39%
08:0018%31%
09:0015%23%
10:0019%15%
11:0017%23%
12:0017%31%
13:0015%39%
14:0015%26%
15:0012%0%
16:0018%0%
17:0023%0%
18:0026%0%
19:0017%0%
20:0049%0%
21:0066%0%
22:0034%0%
23:0031%0%
Wed, Apr 22
24:0036%0%
01:0032%0%
02:0033%0%
03:0026%0%
04:0027%0%
05:0069%0%
06:0036%0%
07:0026%0%
08:0029%0%
09:0027%0%
10:0028%0%
11:0028%0%
12:0028%0%
13:0027%0%
14:0027%0%
15:0027%0%
16:0027%0%
17:0027%0%
18:0026%0%
19:0026%0%
20:0057%0%
21:0054%0%
22:0029%0%
23:0029%0%
Thu, Apr 23
24:0029%0%
01:0031%0%
02:0033%0%
03:0033%0%
04:0033%0%
05:0070%0%
06:0027%0%
07:0025%0%
08:0025%0%
09:0025%0%
10:0027%0%
11:0024%0%
12:0025%0%
13:0025%0%
14:0025%0%
15:0025%0%
16:0025%0%
17:0024%0%
18:0024%0%
19:0024%0%
20:0071%0%
21:0066%0%
22:0029%0%
23:0029%0%
Fri, Apr 24
24:0029%0%
01:0029%0%
02:0011%0%
03:0010%0%
04:009.7%0%
05:0058%0%
06:002.9%0%
07:002.9%0%
08:002.8%0%
09:002.2%0%
10:002.2%0%
11:002.2%0%
12:002.7%0%
13:003.4%0%
14:002.8%0%
15:002.4%0%
16:002.4%0%
17:002.2%0%
18:002%0%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Blue Hour Quality 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
Blue Hour
High Clouds
%
Low Clouds
%
Mid-Level Clouds
%
Relative Humidity
%
Solar Elevation
°
Total Cloud Coverage
%
Visibility
m
Wind Speed
m/s
Tue, Apr 21 Sunrise 06:02 Sunset 20:12
20:00
- 5% 34% 0% 74% 1.5° 34% 24134m 8.1m/s
21:00
- 5% 5% 0% 72% -7.5° 5% 24134m 7.8m/s
22:00
- 5% 4% 0% 69% -15° 5% 24134m 7.8m/s
23:00
- 5% 0% 0% 67% -21° 5% 24134m 7.7m/s
Wed, Apr 22 Sunrise 06:02 Sunset 20:12
24:00
- 5% 2% 0% 70% -26° 5% 24135m 7.7m/s
01:00
- 5% 1% 0% 74% -27° 5% 24134m 7.6m/s
02:00
- 6% 0% 0% 77% -26° 6% 24135m 8.5m/s
03:00
- 74% 0% 1% 80% -22° 74% 24134m 8m/s
04:00
- 72% 0% 0% 84% -17° 72% 24135m 7.1m/s
05:00
- 5% 0% 0% 87% -9.3° 5% 24134m 7.4m/s
06:00
- 0% 0% 0% 89% -0.47° 0% 24135m 7.3m/s
07:00
- 67% 0% 0% 87% 8.4° 67% 24134m 7.8m/s
08:00
- 9% 0% 0% 80% 18° 9% 24134m 7.8m/s
09:00
- 5% 0% 0% 74% 27° 5% 24134m 8.2m/s
10:00
- 11% 0% 0% 65% 36° 11% 24135m 9m/s
11:00
- 49% 0% 2% 59% 44° 49% 24134m 9.5m/s
12:00
- 27% 0% 5% 54% 49° 27% 24134m 10m/s
13:00
- 100% 0% 6% 53% 52° 100% 24135m 10m/s
14:00
- 100% 0% 10% 53% 50° 100% 24135m 9.7m/s
15:00
- 100% 0% 80% 57% 45° 100% 24135m 9.4m/s
16:00
- 100% 0% 100% 60% 38° 100% 24135m 9.1m/s
17:00
- 100% 0% 100% 61% 29° 100% 24135m 7.7m/s
18:00
- 100% 0% 100% 63% 20° 100% 24134m 6.8m/s
19:00
- 100% 0% 100% 66% 11° 100% 24134m 6.6m/s
20:00
- 85% 0% 100% 67% 1.7° 100% 24134m 6.3m/s
21:00
- 63% 0% 100% 69% -7.2° 100% 24134m 6.3m/s
22:00
- 87% 0% 93% 69% -15° 95% 24135m 6.3m/s
23:00
- 66% 0% 36% 70% -21° 67% 24135m 6.2m/s
Thu, Apr 23 Sunrise 06:00 Sunset 20:14
24:00
- 70% 0% 5% 70% -25° 70% 24135m 5.9m/s
01:00
- 44% 0% 4% 73% -27° 44% 24134m 5.7m/s
02:00
- 9% 0% 4% 78% -26° 9% 24135m 5.6m/s
03:00
- 7% 0% 4% 82% -22° 7% 24135m 5.7m/s
04:00
- 6% 0% 0% 85% -16° 6% 24135m 5.6m/s
05:00
- 5% 0% 0% 88% -9° 5% 24135m 5.4m/s
06:00
- 5% 0% 0% 91% 0.01° 5% 24135m 5.2m/s
07:00
- 4% 0% 0% 88% 8.7° 4% 24135m 5.4m/s
08:00
- 0% 0% 0% 79% 18° 0% 24135m 6.2m/s
09:00
- 0% 0% 0% 71% 28° 0% 24134m 7.1m/s
10:00
- 0% 0% 0% 64% 36° 0% 24135m 7.8m/s
11:00
- 0% 0% 0% 60% 44° 0% 24135m 8m/s
12:00
- 0% 0% 0% 57% 50° 0% 24135m 8.1m/s
13:00
- 0% 0% 0% 55% 52° 0% 24134m 8m/s
14:00
- 0% 0% 0% 55% 50° 0% 24135m 7.8m/s
15:00
- 0% 0% 0% 57% 46° 0% 24135m 7.4m/s
16:00
- 0% 0% 0% 59% 38° 0% 24134m 6.9m/s
17:00
- 0% 0% 0% 62% 30° 0% 24135m 6.1m/s
18:00
- 0% 0% 0% 64% 20° 0% 24134m 5.7m/s
19:00
- 0% 0% 0% 66% 11° 0% 24134m 5.4m/s
20:00
- 0% 0% 0% 68% 1.9° 0% 24134m 5.1m/s
21:00
- 0% 0% 0% 66% -7° 0% 24134m 5.3m/s
22:00
- 0% 0% 0% 65% -15° 0% 24134m 5.2m/s
23:00
- 0% 0% 0% 68% -21° 0% 24135m 4.8m/s
Fri, Apr 24 Sunrise 05:58 Sunset 20:16
24:00
- 0% 0% 0% 70% -25° 0% 24135m 4.7m/s
01:00
- 0% 0% 0% 73% -26° 0% 24135m 4.6m/s
02:00
- 2% 0% 2% 71% -25° 2% 24135m 5.9m/s
03:00
- 3% 0% 3% 69% -22° 3% 24135m 7.1m/s
04:00
- 5% 0% 5% 67% -16° 5% 24135m 8.4m/s
05:00
- 7% 0% 4% 68% -8.7° 7% 24135m 7.6m/s
06:00
- 10% 0% 3% 68% 0.25° 10% 24135m 6.8m/s
07:00
- 12% 0% 2% 69% 12% 24135m 6m/s
08:00
- 41% 0% 4% 68% 18° 41% 24135m 5.6m/s
09:00
- 71% 0% 6% 68% 28° 71% 24135m 5.2m/s
10:00
- 100% 0% 9% 68% 37° 100% 24135m 4.8m/s
11:00
- 72% 0% 8% 69% 44° 72% 24135m 4.5m/s
12:00
- 45% 0% 6% 70% 50° 45% 24135m 4.3m/s
13:00
- 18% 0% 5% 71% 52° 18% 24135m 4.1m/s
14:00
- 45% 0% 3% 72% 51° 45% 24135m 3.9m/s
15:00
- 73% 0% 2% 73% 46° 73% 24135m 3.7m/s
16:00
- 100% 0% 0% 74% 39° 100% 24135m 3.5m/s
17:00
- 100% 0% 0% 76% 30° 100% 24135m 3.8m/s
18:00
- 100% 0% 0% 78% 21° 100% 24135m 4.2m/s
19:00
- 100% 0% 0% 79% 11° 100% 24135m 4.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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