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Rule Blue Hour

Sennen Cove - Blue Hour - Cornwall

Sennen, England, United Kingdom

When city lights balance with the deep blue twilight sky

Currently

Real-time conditions
Cloud Cover0%
Moon Altitude-0.2°

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 Sunset
Sennen Cove
Today · 21:40–21:56 · 1h window
Medium confidence
66%
🌉Blue Hour Quality67.1%
Cloud Cover: 0%
Moon Illumination: 61%
Moon Altitude: 42.3°

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the magical twilight conditions that transform Cornwall's coastal landmarks into atmospheric scenes. We combine cloud cover, visibility, and atmospheric conditions to predict optimal blue hour opportunities for lighthouse photography, harbour scenes, and coastal silhouettes.

Cornwall's lighthouses, fishing harbours, and tidal islands create compelling compositions during blue hour—when fading natural light balances perfectly with artificial illumination. The mild maritime climate means clear twilight skies are common, and the peninsula's western position provides extended blue hour periods.

What makes Cornwall special for blue-hour photography:

  • St Michael's Mount - Tidal island castle lit against twilight, causeway reflections in wet sand
  • Working harbours - Padstow and St Ives with fishing boats, harbour lights, and twilight reflections
  • Lighthouse beams - Godrevy and other lighthouses with beams cutting through dusk
  • Coastal silhouettes - Sea stacks and mine ruins profiled against colorful twilight sky

St Michael's Mount offers Cornwall's signature blue hour composition—the medieval castle-topped island illuminated against deepening twilight, with the tidal causeway creating leading lines and wet sand providing mirror reflections. St Ives harbour with its working fishing boats, gallery lights, and chapel creates a classic Cornish twilight scene. Godrevy Lighthouse—Virginia Woolf's inspiration for "To the Lighthouse"—sends its beam across darkening waters during blue hour. The clifftop ruins of Botallack tin mine become dramatic silhouettes against sunset colors, then take on ghostly quality as twilight deepens. Port Isaac and other fishing villages glow with warm cottage lights against cool twilight. The timing requires planning—arrive before sunset to set up, then capture the 20-30 minute window of perfect light balance.

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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%
Sat, May 23
14:0024%0%
15:0024%0%
16:0027%0%
17:0027%0%
18:0027%0%
19:0025%0%
20:0025%0%
21:0067%0%
22:0063%0%
23:0026%0%
Sun, May 24
24:0029%0%
01:0029%0%
02:0029%0%
03:0029%0%
04:0067%0%
05:0067%0%
06:0025%0%
07:0025%0%
08:0025%0%
09:0025%0%
10:0025%0%
11:0022%0%
12:0022%0%
13:0022%0%
14:0022%0%
15:0022%0%
16:0022%0%
17:0022%0%
18:0022%0%
19:0022%0%
20:0022%0%
21:0067%0%
22:0062%0%
23:0027%0%
Mon, May 25
24:0027%0%
01:0027%0%
02:0026%0%
03:0026%0%
04:0063%0%
05:0059%0%
06:0022%0%
07:0022%0%
08:0022%0%
09:0022%0%
10:0022%0%
11:0022%0%
12:0022%0%
13:0022%0%
14:0025%4.2%
15:0025%8.4%
16:0025%13%
17:0025%42%
18:0025%71%
19:0026%100%
20:0029%72%
21:0055%44%
22:0053%15%
23:0028%16%
Tue, May 26
24:0029%16%
01:0029%17%
02:0026%11%
03:0026%5.6%
04:0064%0%
05:0060%0%
06:0022%0%
07:0025%0%
08:0025%0%
09:0022%0%
10:0022%0%
11:0022%0%
12:0021%0%
13:0021%0%
14:0021%0%
15:0022%0%
16:0022%0%
17:0022%17%
18:0022%33%
19:0022%50%
20:003%50%
21:0054%50%
22:0049%50%
23:007.5%38%
Wed, May 27
24:007.7%27%
01:009.1%15%
02:008.6%28%
03:008.7%42%
04:0059%55%
05:0053%45%
06:003%36%
07:003%26%
08:003%34%
09:003%42%
10:003%50%
11:002.9%38%
12:002.9%27%
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
Sun, May 24 Sunrise 05:25 Sunset 21:14
14:00
- 0% 0% 0% 84% 60° 0% 24135m 2.5m/s
15:00
- 0% 0% 0% 82% 55° 0% 24135m 2.6m/s
16:00
- 0% 0% 0% 82% 47° 0% 24134m 2.6m/s
17:00
- 0% 0% 0% 82% 38° 0% 24134m 2.5m/s
18:00
- 0% 0% 0% 82% 29° 0% 24134m 2.5m/s
19:00
- 0% 0% 0% 81% 19° 0% 24134m 2.9m/s
20:00
- 0% 0% 0% 81% 9.8° 0% 24135m 3.9m/s
21:00
- 0% 0% 0% 80% 1.5° 0% 24134m 4.7m/s
22:00
- 0% 0% 0% 80% -6.4° 0% 24135m 4.9m/s
23:00
- 0% 0% 0% 80% -13° 0% 24134m 5.1m/s
Mon, May 25 Sunrise 05:25 Sunset 21:14
24:00
- 0% 0% 0% 81% -17° 0% 24135m 5.2m/s
01:00
- 0% 0% 0% 83% -19° 0% 24135m 5.5m/s
02:00
- 0% 0% 0% 84% -18° 0% 24135m 6m/s
03:00
- 0% 0% 0% 86% -16° 0% 24135m 6.7m/s
04:00
- 0% 0% 0% 86% -11° 0% 24135m 7.3m/s
05:00
- 0% 0% 0% 87% -3.9° 0% 24134m 7.7m/s
06:00
- 0% 0% 0% 87% 4.2° 0% 24134m 8m/s
07:00
- 0% 0% 0% 87% 13° 0% 24134m 8m/s
08:00
- 0% 0% 0% 88% 22° 0% 24135m 7.8m/s
09:00
- 0% 0% 0% 90% 32° 0% 24134m 7.9m/s
10:00
- 0% 0% 0% 92% 41° 0% 24135m 8.1m/s
11:00
- 0% 0% 0% 92% 50° 0% 24135m 8.1m/s
12:00
- 0% 0% 0% 93% 57° 0% 24134m 8m/s
13:00
- 0% 0% 0% 93% 61° 0% 24135m 7.8m/s
14:00
- 0% 0% 0% 93% 60° 0% 24134m 7.8m/s
15:00
- 0% 0% 0% 94% 55° 0% 24134m 7.6m/s
16:00
- 0% 0% 0% 94% 47° 0% 24134m 7.3m/s
17:00
- 1% 0% 1% 93% 38° 2% 24134m 6.9m/s
18:00
- 5% 0% 5% 92% 29° 5% 24135m 6.6m/s
19:00
- 5% 0% 51% 92% 19° 51% 24134m 6.5m/s
20:00
- 13% 0% 15% 92% 9.9° 15% 24135m 6.2m/s
21:00
- 20% 0% 73% 91% 1.6° 73% 24134m 5.8m/s
22:00
- 37% 0% 90% 91% -6.2° 90% 24135m 5.5m/s
23:00
- 1% 0% 21% 92% -12° 21% 24134m 5.3m/s
Tue, May 26 Sunrise 05:24 Sunset 21:15
24:00
- 0% 0% 0% 93% -17° 0% 24134m 5.5m/s
01:00
- 0% 0% 0% 93% -19° 0% 24135m 6m/s
02:00
- 0% 0% 0% 93% -18° 0% 24134m 5.9m/s
03:00
- 0% 0% 0% 93% -15° 0% 24135m 5.4m/s
04:00
- 0% 0% 0% 93% -10° 0% 24134m 5.3m/s
05:00
- 0% 0% 0% 94% -3.7° 0% 24134m 5.6m/s
06:00
- 0% 0% 0% 95% 4.3° 0% 24134m 6.2m/s
07:00
- 0% 0% 0% 95% 13° 0% 24135m 6.8m/s
08:00
- 0% 0% 0% 96% 22° 0% 24134m 7.3m/s
09:00
- 0% 0% 0% 96% 32° 0% 24135m 7.4m/s
10:00
- 0% 0% 0% 96% 41° 0% 24134m 7.5m/s
11:00
- 0% 4% 0% 96% 50° 4% 24135m 7.2m/s
12:00
- 0% 9% 0% 97% 57° 9% 24134m 7.1m/s
13:00
- 0% 18% 0% 98% 61° 18% 24134m 7m/s
14:00
- 0% 8% 0% 97% 60° 8% 24134m 6.8m/s
15:00
- 0% 0% 0% 95% 55° 0% 24135m 6.9m/s
16:00
- 0% 0% 0% 94% 47° 0% 24135m 6.8m/s
17:00
- 0% 0% 0% 92% 38° 0% 24134m 6.8m/s
18:00
- 0% 0% 0% 90% 29° 0% 24135m 6.7m/s
19:00
- 0% 0% 0% 87% 19° 0% 24134m 6.9m/s
20:00
- 4% 0% 1% 86% 10° 4% 24134m 7.2m/s
21:00
- 8% 0% 1% 84% 1.7° 8% 24135m 7.6m/s
22:00
- 12% 0% 2% 82% -6.1° 12% 24135m 7.9m/s
23:00
- 10% 0% 2% 83% -12° 10% 24135m 8.2m/s
Wed, May 27 Sunrise 05:23 Sunset 21:16
24:00
- 7% 0% 1% 84% -16° 7% 24135m 8.5m/s
01:00
- 5% 0% 1% 85% -19° 5% 24135m 8.9m/s
02:00
- 3% 0% 0% 85% -18° 3% 24135m 9.2m/s
03:00
- 2% 0% 0% 86% -15° 2% 24135m 9.5m/s
04:00
- 0% 0% 0% 87% -10° 0% 24135m 9.8m/s
05:00
- 0% 0% 0% 87% -3.6° 0% 24135m 10m/s
06:00
- 0% 0% 0% 86% 4.4° 0% 24135m 10m/s
07:00
- 0% 0% 0% 86% 13° 0% 24135m 11m/s
08:00
- 0% 0% 0% 87% 23° 0% 24135m 10m/s
09:00
- 0% 0% 0% 87% 32° 0% 24135m 10m/s
10:00
- 0% 0% 0% 88% 42° 0% 24135m 10m/s
11:00
- 0% 0% 0% 89% 50° 0% 22209m 9.6m/s
12:00
- 0% 0% 0% 89% 57° 0% 20282m 8.8m/s
13:00
- 1% 0% 0% 90% 61° 1% 18356m 7.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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