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Rule Blue Hour

Brighton - Blue Hour - London & Southeast England

Brighton, England, United Kingdom

When city lights balance with the deep blue twilight sky

Currently

Real-time conditions
Cloud Cover48%
Moon Altitude10.8°

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
Brighton
Wed, Mar 18 · 18:30–18:43 · 1h window
Medium confidence
47%
🌉Blue Hour Quality69.5%
Cloud Cover: 5%
Moon Illumination: 0%
Moon Altitude: -2.1°
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Brighton
Thu, Mar 19 · 05:32–05:45
🌉Blue Hour Quality:65.1%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunset
Brighton
Thu, Mar 19 · 18:32–18:45
🌉Blue Hour Quality:65.5%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Brighton
Fri, Mar 20 · 05:30–05:42
🌉Blue Hour Quality:65.4%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunset
Brighton
Fri, Mar 20 · 18:34–18:46
🌉Blue Hour Quality:68%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunset
Brighton
Sat, Mar 21 · 18:35–18:48
🌉Blue Hour Quality:67.9%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts optimal blue hour conditions for London's world-class urban skyline and Southeast England's coastal scenes. We track civil twilight timing, cloud cover, and atmospheric clarity to identify when the deep blue sky will complement city lights and landmarks.

London offers some of Europe's finest blue hour photography—the contrast between modern glass towers like the Shard and historic landmarks like Tower Bridge creates visual tension that works brilliantly during twilight. Southeast coastal towns like Brighton and Whitstable add maritime character with piers and harbors lit up against twilight skies.

What makes London and Southeast blue hour exceptional:

  • Iconic skyline - The Shard, Gherkin, Walkie Talkie, and Tower Bridge combine ancient and modern architecture
  • Thames reflections - River mirrors the illuminated skyline creating double-exposure compositions
  • Brighton Pier - Historic Victorian pier lit up against Channel twilight creates classic blue hour scene
  • Whitstable harbour - Working harbor with boats, oyster shacks, and maritime character at dusk

Best conditions occur during clear or partly cloudy evenings when city lights shine bright against deep blue sky. Winter blue hour happens at convenient times (4-5pm), while summer requires late evening shooting (9-10pm). Popular viewpoints include Waterloo Bridge, Tower Bridge walkway, and South Bank.

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72-hour requirements breakdown

What passed or failed, hour by hour
1matching 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%
Wed, Mar 11
07:001.7%47%
08:001%41%
09:001%42%
10:001%41%
11:001%40%
12:003.2%39%
13:003.2%36%
14:002.7%18%
15:003.2%0%
16:003.2%0%
17:003.3%0%
18:0067%0%
19:007.4%0%
20:006.4%0%
21:009.9%0%
22:009.5%13%
23:009.5%26%
Thu, Mar 12
24:009.6%39%
01:009.1%26%
02:009.1%13%
03:007.8%0%
04:007.8%27%
05:0046%55%
06:0038%82%
07:001.6%76%
08:001.6%70%
09:002%64%
10:002%75%
11:002%86%
12:001.5%97%
13:001%90%
14:001%84%
15:001%77%
16:001%83%
17:001.5%88%
18:0016%94%
19:002.4%96%
20:002.4%98%
21:002.4%100%
22:002.5%100%
23:002.4%100%
Fri, Mar 13
24:002%100%
01:001.2%73%
02:002%47%
03:001.5%20%
04:001.5%21%
05:0020%21%
06:0018%22%
07:001%27%
08:001.2%32%
09:001.2%38%
10:001.2%40%
11:002.2%42%
12:002.4%44%
13:001.4%46%
14:001.2%48%
15:001%50%
16:001.2%39%
17:001.5%28%
18:0032%17%
19:0019%11%
20:004.8%5.6%
21:004.4%0%
22:005%0%
23:004.5%0%
Sat, Mar 14
24:004.5%0%
01:008.7%0%
02:0011%0%
03:0011%0%
04:0010%13%
05:0033%26%
06:0024%39%
07:002.3%54%
08:001.2%69%
09:001.2%84%
10:001.2%87%
11:003%90%
12:003.6%93%
13:003.1%67%
14:002.2%40%
15:003.6%14%
16:003.7%22%
17:003.4%31%
18:0049%39%
19:0034%32%
20:008.7%24%
21:0010%17%
22:0010%28%
23:0010%38%
Sun, Mar 15
24:0010%49%
01:0010%47%
02:008.7%45%
03:008.5%43%
04:006.8%52%
05:0031%60%
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
Thu, Mar 12 Sunrise 06:21 Sunset 17:59
07:00
- 31% 47% 28% 82% 5.4° 48% 24134m 12m/s
08:00
- 39% 45% 6% 82% 14° 51% 24134m 12m/s
09:00
- 100% 5% 66% 83% 22° 100% 24134m 13m/s
10:00
- 100% 5% 68% 82% 29° 100% 24134m 14m/s
11:00
- 100% 0% 100% 82% 34° 100% 24134m 14m/s
12:00
- 100% 44% 81% 81% 36° 100% 24135m 14m/s
13:00
- 100% 100% 100% 81% 35° 100% 24135m 15m/s
14:00
- 100% 100% 5% 80% 31° 100% 24135m 16m/s
15:00
- 100% 100% 5% 80% 25° 100% 24134m 17m/s
16:00
- 97% 100% 81% 82% 17° 100% 24135m 17m/s
17:00
- 100% 100% 2% 85% 8.6° 100% 24135m 17m/s
18:00
- 100% 100% 72% 88% -0.38° 100% 24135m 17m/s
19:00
- 100% 100% 68% 88% -10° 100% 24134m 17m/s
20:00
- 100% 100% 100% 91% -19° 100% 23898m 17m/s
21:00
- 100% 100% 84% 91% -28° 100% 24134m 18m/s
22:00
- 100% 100% 24% 90% -35° 100% 24134m 18m/s
23:00
- 100% 100% 49% 90% -40° 100% 24135m 18m/s
Fri, Mar 13 Sunrise 06:19 Sunset 18:01
24:00
- 100% 100% 100% 89% -42° 100% 16670m 19m/s
01:00
- 100% 100% 100% 91% -41° 100% 8713m 19m/s
02:00
- 100% 100% 100% 88% -37° 100% 17039m 13m/s
03:00
- 100% 100% 100% 86% -30° 100% 11100m 13m/s
04:00
- 100% 100% 100% 87% -22° 100% 10138m 10m/s
05:00
- 100% 100% 100% 81% -13° 100% 20676m 10m/s
06:00
- 100% 99% 100% 77% -3.8° 100% 24135m 10m/s
07:00
- 100% 100% 100% 80% 5.7° 100% 24134m 8.7m/s
08:00
- 100% 100% 100% 70% 15° 100% 24134m 8.8m/s
09:00
- 100% 100% 100% 69% 23° 100% 24134m 8.5m/s
10:00
- 100% 100% 100% 66% 30° 100% 24134m 9m/s
11:00
- 100% 6% 100% 66% 34° 100% 24134m 8.8m/s
12:00
- 100% 6% 100% 62% 36° 100% 24134m 9.4m/s
13:00
- 100% 100% 100% 64% 35° 100% 24134m 9.7m/s
14:00
- 100% 98% 100% 68% 31° 100% 24135m 9.4m/s
15:00
- 55% 100% 100% 81% 25° 100% 21318m 8.4m/s
16:00
- 100% 100% 100% 79% 18° 100% 24134m 6.4m/s
17:00
- 99% 51% 100% 74% 8.9° 100% 24134m 5.9m/s
18:00
- 100% 98% 100% 73% 0.03° 100% 24135m 3.5m/s
19:00
- 100% 98% 100% 70% -9.9° 100% 24135m 3.7m/s
20:00
- 2% 98% 100% 66% -19° 100% 24135m 3.8m/s
21:00
- 0% 66% 100% 66% -28° 100% 24135m 5.3m/s
22:00
- 0% 56% 100% 65% -35° 100% 24135m 5.8m/s
23:00
- 0% 7% 97% 68% -40° 97% 24135m 5.6m/s
Sat, Mar 14 Sunrise 06:17 Sunset 18:03
24:00
- 0% 0% 96% 68% -42° 96% 24135m 4.5m/s
01:00
- 0% 0% 21% 68% -41° 21% 24135m 5.1m/s
02:00
- 0% 0% 0% 69% -36° 0% 24135m 5.1m/s
03:00
- 0% 0% 0% 72% -30° 0% 24134m 5.3m/s
04:00
- 0% 3% 5% 72% -22° 5% 24134m 5m/s
05:00
- 0% 71% 5% 74% -13° 71% 24135m 5.3m/s
06:00
- 0% 77% 6% 76% -3.4° 77% 24134m 5.3m/s
07:00
- 0% 34% 5% 78% 6.1° 34% 24134m 5.1m/s
08:00
- 0% 92% 59% 80% 15° 92% 24135m 5m/s
09:00
- 0% 95% 100% 80% 23° 100% 24135m 5.2m/s
10:00
- 0% 99% 100% 76% 30° 100% 24134m 6.8m/s
11:00
- 0% 5% 5% 68% 35° 5% 24135m 7.3m/s
12:00
- 0% 5% 5% 64% 37° 5% 24135m 7m/s
13:00
- 0% 19% 0% 60% 36° 19% 24135m 7m/s
14:00
- 0% 45% 0% 59% 32° 45% 18775m 7.3m/s
15:00
- 0% 5% 2% 60% 26° 5% 22244m 7m/s
16:00
- 0% 5% 0% 61% 18° 5% 24134m 6m/s
17:00
- 0% 5% 3% 64% 9.1° 5% 19819m 6.7m/s
18:00
- 0% 3% 32% 68% 0.25° 32% 24135m 6.4m/s
19:00
- 0% 2% 23% 74% -9.7° 23% 24135m 4.9m/s
20:00
- 0% 1% 14% 79% -19° 14% 24135m 3.5m/s
21:00
- 0% 0% 5% 85% -27° 5% 24135m 2m/s
22:00
- 0% 0% 3% 86% -34° 3% 24135m 1.9m/s
23:00
- 0% 0% 2% 87% -39° 2% 24135m 1.7m/s
Sun, Mar 15 Sunrise 06:14 Sunset 18:04
24:00
- 0% 0% 0% 89% -41° 0% 24135m 1.6m/s
01:00
- 1% 0% 3% 89% -40° 3% 24135m 1.6m/s
02:00
- 2% 0% 6% 89% -36° 6% 24135m 1.5m/s
03:00
- 2% 0% 9% 89% -30° 9% 24135m 1.5m/s
04:00
- 2% 0% 37% 89% -22° 37% 24135m 1.6m/s
05:00
- 1% 0% 66% 89% -13° 66% 24135m 1.7m/s
06:00
- 0% 0% 94% 89% -3° 94% 24135m 1.8m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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