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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 Cover64%
Moon Altitude3.4°

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
Today · 21:21–21:38 · 1h window
Medium confidence
67%
🌉Blue Hour Quality69.2%
Cloud Cover: 0%
Moon Illumination: 61%
Moon Altitude: 40.8°
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Brighton
Tomorrow · 04:15–04:32
🌉Blue Hour Quality:72.2%
High
blue-hour weather icon
Good Blue Hour (clear) at Sunset
Brighton
Tomorrow · 21:23–21:40
🌉Blue Hour Quality:67.1%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Brighton
Tue, May 26 · 04:14–04:31
🌉Blue Hour Quality:66.4%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Brighton
Wed, May 27 · 04:13–04:30
🌉Blue Hour Quality:72%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunset
Brighton
Thu, May 28 · 21:27–21:44
🌉Blue Hour Quality:70.6%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
Brighton
Fri, May 29 · 04:10–04:28
🌉Blue Hour Quality:73.3%
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
7matching 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
14:0025%0%
15:0026%0%
16:0029%0%
17:0031%0%
18:0029%0%
19:0026%0%
20:0029%0%
21:0075%0%
22:0052%0%
23:0031%0%
Sun, May 24
24:0034%0%
01:0031%0%
02:0031%0%
03:0032%0%
04:0070%0%
05:0038%0%
06:0027%0%
07:0029%0%
08:0024%0%
09:0024%0%
10:0027%0%
11:0029%0%
12:0027%0%
13:0023%0%
14:0024%0%
15:0024%0%
16:0022%0%
17:0024%0%
18:0022%0%
19:0022%0%
20:0022%0%
21:0069%0%
22:0049%0%
23:0027%0%
Mon, May 25
24:0027%0%
01:0030%0%
02:0030%0%
03:0030%0%
04:0072%0%
05:0037%0%
06:0025%0%
07:0022%0%
08:0022%0%
09:0022%0%
10:0025%0%
11:0019%0%
12:0019%0%
13:0020%0%
14:0020%1.7%
15:0020%3.3%
16:0023%5%
17:0023%3.3%
18:0022%1.7%
19:0022%0%
20:0022%5%
21:0067%10%
22:0048%15%
23:0027%27%
Tue, May 26
24:0027%38%
01:0027%50%
02:0027%33%
03:0027%17%
04:0066%0%
05:0022%0%
06:0022%0%
07:0022%0%
08:0022%0%
09:0022%0%
10:0024%0%
11:0023%17%
12:0023%33%
13:0025%50%
14:0025%50%
15:0025%50%
16:0025%50%
17:0025%67%
18:0024%83%
19:0024%100%
20:003.8%67%
21:0071%33%
22:0064%0%
23:0011%17%
Wed, May 27
24:0011%33%
01:0010%50%
02:0010%35%
03:0011%20%
04:0072%4.9%
05:003.8%3.3%
06:003.7%1.6%
07:003.6%0%
08:003.7%0%
09:003.7%0%
10:003.7%0%
11:003.7%0%
12:003.7%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
Sun, May 24 Sunrise 05:00 Sunset 20:55
14:00
- 5% 63% 0% 95% 58° 64% 7118m 3.4m/s
15:00
- 5% 63% 0% 94% 52° 64% 7100m 2.9m/s
16:00
- 5% 55% 0% 94% 44° 57% 7127m 2.2m/s
17:00
- 5% 36% 0% 92% 34° 38% 7296m 1.9m/s
18:00
- 4% 7% 0% 90% 25° 8% 21836m 2.2m/s
19:00
- 3% 3% 0% 86% 16° 6% 21841m 2.4m/s
20:00
- 0% 1% 0% 84% 6.9° 1% 22030m 2.6m/s
21:00
- 0% 0% 0% 83% -1.2° 0% 24134m 3.1m/s
22:00
- 0% 0% 0% 85% -8.3° 0% 24135m 3.6m/s
23:00
- 0% 0% 0% 88% -14° 0% 24134m 3.9m/s
Mon, May 25 Sunrise 05:00 Sunset 20:55
24:00
- 0% 0% 0% 90% -17° 0% 24135m 3.9m/s
01:00
- 0% 0% 0% 89% -18° 0% 24135m 3.9m/s
02:00
- 0% 0% 0% 87% -17° 0% 24135m 3.9m/s
03:00
- 0% 0% 0% 85% -13° 0% 24135m 3.8m/s
04:00
- 0% 0% 0% 84% -7.7° 0% 24135m 3.9m/s
05:00
- 0% 0% 0% 84% -0.23° 0% 24134m 4m/s
06:00
- 0% 0% 0% 86% 7.6° 0% 24134m 4.2m/s
07:00
- 0% 0% 0% 88% 17° 0% 24134m 3.8m/s
08:00
- 0% 0% 0% 89% 26° 0% 24135m 3.6m/s
09:00
- 0% 0% 0% 89% 35° 0% 24134m 4.1m/s
10:00
- 0% 1% 0% 88% 44° 1% 24135m 4.6m/s
11:00
- 0% 2% 0% 87% 52° 2% 21871m 4.7m/s
12:00
- 0% 3% 0% 86% 58° 3% 21848m 5.2m/s
13:00
- 0% 3% 0% 86% 60° 3% 21839m 5.3m/s
14:00
- 0% 3% 0% 85% 58° 3% 21837m 5m/s
15:00
- 0% 3% 0% 83% 52° 3% 21842m 4.8m/s
16:00
- 0% 2% 0% 81% 44° 2% 21884m 4.9m/s
17:00
- 0% 0% 0% 80% 35° 0% 24134m 4.9m/s
18:00
- 0% 0% 0% 79% 25° 0% 24135m 4.9m/s
19:00
- 0% 0% 0% 79% 16° 0% 24134m 5.2m/s
20:00
- 0% 0% 0% 80% 0% 24135m 5.3m/s
21:00
- 0% 0% 0% 80% -0.97° 0% 24134m 5.3m/s
22:00
- 0% 0% 0% 80% -8.2° 0% 24135m 5.1m/s
23:00
- 0% 0% 0% 81% -14° 0% 24134m 4.8m/s
Tue, May 26 Sunrise 04:59 Sunset 20:56
24:00
- 0% 0% 0% 82% -17° 0% 24134m 4.5m/s
01:00
- 0% 0% 0% 84% -18° 0% 24135m 3.9m/s
02:00
- 0% 0% 0% 86% -17° 0% 24134m 3.4m/s
03:00
- 0% 0% 0% 88% -13° 0% 24135m 3.2m/s
04:00
- 0% 0% 0% 89% -7.6° 0% 24134m 3.5m/s
05:00
- 0% 0% 0% 88% 0.008° 0% 24134m 3.8m/s
06:00
- 0% 0% 0% 88% 7.8° 0% 24134m 4.1m/s
07:00
- 0% 0% 0% 87% 17° 0% 24135m 4.1m/s
08:00
- 0% 0% 0% 86% 26° 0% 24134m 4m/s
09:00
- 0% 0% 0% 85% 35° 0% 24135m 4m/s
10:00
- 0% 0% 0% 82% 44° 0% 24134m 4m/s
11:00
- 0% 0% 0% 80% 52° 0% 24135m 4.1m/s
12:00
- 0% 0% 0% 77% 58° 0% 24134m 4.5m/s
13:00
- 0% 0% 0% 77% 60° 0% 24134m 4.7m/s
14:00
- 0% 0% 0% 77% 58° 0% 24134m 4.2m/s
15:00
- 0% 0% 0% 75% 52° 0% 24135m 3.5m/s
16:00
- 0% 0% 0% 74% 44° 0% 24135m 3.2m/s
17:00
- 0% 0% 0% 72% 35° 0% 24134m 3.2m/s
18:00
- 0% 0% 0% 70% 25° 0% 24135m 3.3m/s
19:00
- 0% 0% 0% 70% 16° 0% 24134m 3.4m/s
20:00
- 0% 0% 0% 73% 7.2° 0% 24134m 3.2m/s
21:00
- 0% 0% 0% 76% -0.77° 0% 24135m 3m/s
22:00
- 0% 0% 0% 79% -8° 0% 24135m 2.8m/s
23:00
- 0% 0% 0% 80% -13° 0% 24135m 3.2m/s
Wed, May 27 Sunrise 04:58 Sunset 20:57
24:00
- 0% 0% 0% 81% -17° 0% 24135m 3.6m/s
01:00
- 0% 0% 0% 82% -18° 0% 24135m 4m/s
02:00
- 0% 0% 0% 77% -17° 0% 24135m 4.6m/s
03:00
- 0% 0% 0% 72% -13° 0% 24135m 5.2m/s
04:00
- 0% 0% 0% 67% -7.5° 0% 24135m 5.8m/s
05:00
- 2% 0% 0% 65% 0.11° 2% 24135m 6m/s
06:00
- 3% 0% 0% 63% 7.9° 3% 24135m 6.1m/s
07:00
- 4% 0% 0% 60% 17° 4% 24135m 6.2m/s
08:00
- 3% 0% 0% 60% 26° 3% 24135m 6.3m/s
09:00
- 2% 0% 0% 60% 36° 2% 24135m 6.4m/s
10:00
- 0% 0% 0% 61% 45° 0% 24135m 6.5m/s
11:00
- 0% 0% 0% 63% 53° 0% 24135m 6.3m/s
12:00
- 0% 0% 0% 65% 58° 0% 24135m 6.2m/s
13:00
- 0% 0% 0% 66% 61° 0% 24135m 6.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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