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Rule Blue Hour

Blue Hour Forecast for London, London & Southeast England

London, England, United Kingdom

London's Thames bends connect Tower Bridge, historic riverfronts, the Shard, and modern towers, with bridges providing elevated leading lines.

Currently

Real-time conditions
Cloud Cover0%
Moon Altitude-21.4°

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 Sunrise
London
Today · 04:17–04:34 · 1h window
High confidence
77%
🌉Blue Hour Quality72%
Cloud Cover: 0%
Moon Illumination: 6%
Moon Altitude: -19.9°
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
London
Tomorrow · 04:18–04:36
🌉Blue Hour Quality:72.9%
High
blue-hour weather icon
Good Blue Hour (clear) at Sunset
London
Tomorrow · 21:36–21:53
🌉Blue Hour Quality:81%
High
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
London
Sat, Jul 18 · 04:20–04:37
🌉Blue Hour Quality:82.7%
High
blue-hour weather icon
Good Blue Hour (clear) at Sunset
London
Sat, Jul 18 · 21:35–21:52
🌉Blue Hour Quality:70.3%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunrise
London
Mon, Jul 20 · 04:23–04:40
🌉Blue Hour Quality:76.5%
Medium
blue-hour weather icon
Good Blue Hour (clear) at Sunset
London
Mon, Jul 20 · 21:32–21:49
🌉Blue Hour Quality:75%
Medium
+3 more windows in the next 14 days

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Blue Hour conditions across London & Southeast England. The requirements and hourly values below show how those signals apply at London.

Explore Blue Hour conditions across London & Southeast England →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at London during the last 365 days.

Last 30 days
49
recorded matching windows · 76% average confidence
Last 90 days
98
recorded matching windows · 74% average confidence
Last 365 days
121
recorded matching windows · 75% average confidence
Most frequent recorded start hour

04:00 local time, shared by 27 of 121 matches recorded in the last 365 days.

Most represented month

June, with 33 of 121 matches recorded in the last 365 days.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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95-hour requirements breakdown

When available, the detailed table below covers only the stated 95-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

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%
Wed, Jul 15
03:0030%0%
04:0070%0%
05:0037%0%
06:0025%0%
07:0025%0%
08:0027%0%
09:0025%0%
10:0025%0%
11:0025%0%
12:0024%0%
13:0023%0%
14:0024%0%
15:0023%0%
16:0023%0%
17:0026%0%
18:0026%0%
19:0023%0%
20:0023%0%
21:0074%0%
22:0071%0%
23:0029%0%
Thu, Jul 16
24:0030%0%
01:0028%0%
02:0027%0%
03:0027%0%
04:0072%0%
05:0038%0%
06:0025%0%
07:0027%0%
08:0028%0%
09:0028%0%
10:0027%0%
11:0027%0%
12:0025%0%
13:0025%0%
14:0025%0%
15:0025%0%
16:0029%0%
17:0027%0%
18:0027%0%
19:0026%0%
20:0030%8.3%
21:0082%17%
22:0075%25%
23:0038%33%
Fri, Jul 17
24:0036%42%
01:0037%50%
02:0034%33%
03:0032%17%
04:0073%0%
05:0043%0%
06:0030%0%
07:0027%0%
08:0028%1.6%
09:0030%3.3%
10:0031%4.9%
11:0029%3.3%
12:0025%1.6%
13:0027%0%
14:0022%0%
15:0020%0%
16:0019%0%
17:0013%0%
18:0015%0%
19:0015%0%
20:0025%0%
21:0081%0%
22:0059%0%
23:0033%0%
Sat, Jul 18
24:0034%0%
01:0038%0%
02:0037%0%
03:0037%0%
04:0083%0%
05:0061%0%
06:0029%0%
07:0033%0%
08:0028%0%
09:0027%0%
10:0025%0%
11:0024%0%
12:0024%0%
13:0028%0%
14:001.9%0%
15:001.9%0%
16:001.9%0%
17:002.4%0%
18:002.8%0%
19:003.4%0%
20:003.5%0%
21:0070%0%
22:0064%0%
23:008.9%0%
Sun, Jul 19
24:006.2%0%
01:006%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
Thu, Jul 16 Sunrise 05:02 Sunset 21:10
03:00
- 0% 0% 0% 71% -13° 0% 24134m 4m/s
04:00
- 0% 0% 0% 73% -7.8° 0% 24134m 3.6m/s
05:00
- 0% 0% 0% 74% -0.78° 0% 24135m 3.5m/s
06:00
- 0% 0% 0% 74% 0% 24135m 3.4m/s
07:00
- 0% 0% 0% 67% 16° 0% 24134m 4m/s
08:00
- 0% 0% 0% 55% 25° 0% 24134m 3.9m/s
09:00
- 0% 0% 0% 43% 34° 0% 24134m 4.2m/s
10:00
- 0% 0% 0% 36% 43° 0% 24135m 4.2m/s
11:00
- 0% 0% 0% 31% 51° 0% 24135m 3.9m/s
12:00
- 0% 0% 0% 27% 57° 0% 24135m 3.8m/s
13:00
- 0% 0% 0% 24% 60° 0% 24135m 3.8m/s
14:00
- 0% 0% 0% 21% 58° 0% 24134m 3.6m/s
15:00
- 0% 0% 2% 20% 53° 2% 24135m 3.5m/s
16:00
- 0% 2% 3% 20% 45° 3% 24135m 4m/s
17:00
- 0% 1% 3% 22% 36° 3% 24134m 4.7m/s
18:00
- 0% 1% 0% 28% 27° 1% 24135m 5.1m/s
19:00
- 1% 0% 5% 31% 18° 6% 24134m 4.6m/s
20:00
- 0% 0% 7% 34% 8.7° 7% 24134m 4m/s
21:00
- 0% 0% 0% 38% 0.9° 0% 24135m 3.4m/s
22:00
- 0% 0% 3% 42% -6.5° 3% 24134m 3.7m/s
23:00
- 5% 0% 3% 42% -12° 5% 24135m 3.6m/s
Fri, Jul 17 Sunrise 05:02 Sunset 21:10
24:00
- 8% 0% 0% 46% -16° 8% 24135m 3.1m/s
01:00
- 5% 0% 0% 50% -17° 5% 24134m 2.6m/s
02:00
- 7% 0% 0% 53% -16° 7% 24135m 2.5m/s
03:00
- 7% 0% 0% 56% -13° 7% 24134m 2.2m/s
04:00
- 7% 0% 0% 60% -7.9° 7% 24135m 2.5m/s
05:00
- 1% 0% 0% 64% -0.97° 1% 24135m 2.7m/s
06:00
- 0% 0% 0% 66% 6.8° 0% 24134m 3m/s
07:00
- 0% 0% 0% 62% 15° 0% 24135m 2.7m/s
08:00
- 1% 0% 0% 55% 25° 1% 24134m 3.3m/s
09:00
- 10% 0% 0% 48% 34° 10% 24134m 3.3m/s
10:00
- 5% 0% 3% 41% 43° 5% 24135m 3.4m/s
11:00
- 5% 0% 5% 34% 51° 5% 24134m 3m/s
12:00
- 16% 4% 26% 28% 57° 26% 24135m 2.8m/s
13:00
- 14% 4% 24% 26% 60° 24% 24135m 2.7m/s
14:00
- 20% 0% 5% 24% 58° 20% 24135m 2.5m/s
15:00
- 5% 0% 2% 22% 52° 5% 24135m 2.3m/s
16:00
- 0% 5% 0% 20% 45° 5% 24135m 2.2m/s
17:00
- 0% 50% 1% 19% 36° 50% 24134m 2.8m/s
18:00
- 0% 61% 39% 19% 27° 61% 24134m 3.5m/s
19:00
- 5% 27% 42% 22% 17° 42% 24134m 4.6m/s
20:00
- 14% 5% 4% 27% 8.6° 14% 24135m 4.5m/s
21:00
- 19% 5% 0% 31% 0.78° 19% 24135m 3.7m/s
22:00
- 95% 0% 0% 34% -6.7° 95% 24134m 3.7m/s
23:00
- 98% 0% 0% 36% -12° 98% 24135m 4.7m/s
Sat, Jul 18 Sunrise 05:03 Sunset 21:08
24:00
- 39% 0% 0% 42% -16° 39% 24134m 4.5m/s
01:00
- 1% 0% 0% 47% -17° 1% 24134m 4m/s
02:00
- 0% 0% 0% 51% -16° 0% 24134m 3.2m/s
03:00
- 0% 0% 0% 54% -13° 0% 24134m 3.1m/s
04:00
- 1% 0% 0% 57% -8.1° 1% 24135m 2.9m/s
05:00
- 5% 0% 0% 60% -1.2° 5% 24134m 2.7m/s
06:00
- 10% 0% 0% 62% 6.7° 10% 24134m 2.9m/s
07:00
- 24% 0% 3% 58% 15° 24% 24134m 3.3m/s
08:00
- 16% 22% 2% 46% 25° 38% 24134m 2.9m/s
09:00
- 8% 45% 1% 35% 34° 53% 24135m 2.5m/s
10:00
- 0% 67% 0% 23% 43° 67% 24135m 2.1m/s
11:00
- 0% 75% 1% 30% 51° 75% 24135m 3.5m/s
12:00
- 0% 84% 2% 37% 57° 84% 24135m 4.8m/s
13:00
- 0% 92% 2% 44% 59° 92% 24135m 6.2m/s
14:00
- 0% 76% 11% 53% 58° 76% 20476m 5.9m/s
15:00
- 0% 59% 20% 61% 52° 61% 16817m 5.6m/s
16:00
- 0% 43% 29% 70% 45° 45% 13158m 5.2m/s
17:00
- 0% 30% 20% 73% 36° 31% 16817m 4.6m/s
18:00
- 0% 17% 10% 76% 27° 18% 20476m 4m/s
19:00
- 0% 4% 0% 79% 17° 4% 24135m 3.4m/s
20:00
- 0% 3% 0% 80% 8.5° 3% 24135m 3.4m/s
21:00
- 0% 1% 0% 82% 0.66° 1% 24135m 3.5m/s
22:00
- 0% 0% 0% 83% -6.8° 0% 24135m 3.5m/s
23:00
- 33% 2% 0% 82% -12° 33% 24135m 3.7m/s
Sun, Jul 19 Sunrise 05:04 Sunset 21:07
24:00
- 67% 4% 0% 81% -16° 67% 24135m 4m/s
01:00
- 100% 6% 0% 81% -18° 100% 24135m 4.3m/s
02:00
- 100% 4% 33% 70% -17° 100% 24135m 4.2m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

Forecast generated

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