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Rule Blue Hour

Rovinj - Blue Hour - Croatian Coast

Rovinj, Istria, Croatia

When city lights balance with the deep blue twilight sky

No opportunities right now
Here’s what usually blocks matches

No Blue Hour opportunities in the next 14 days

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Rule requirements (key thresholds)
Blue Hour · Any Blue Hour Quality · ≥ 65.0% Precipitation Chance · ≤ 15.0%

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Blue Hour Quality 97% failing
Blue Hour 92% failing

Currently

Real-time conditions
Cloud Cover100%
Moon Altitude-14.9°

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Zagreb

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

What this forecast looks for

Plain-language explanation from the rule

Croatia's Adriatic coast transforms during blue hour as medieval walled cities illuminate their honey-colored stone fortifications against the deepening twilight sky. The warm glow of street lamps and restaurant lighting creates perfect color contrast with the cool blue Adriatic atmosphere.

Dubrovnik's Old Town becomes a glowing jewel when viewed from Mount Srđ or the city walls themselves. The limestone fortifications, illuminated from within, create a golden circuit around the darkening terracotta rooftops. Split's Diocletian's Palace—a 1,700-year-old Roman structure forming the city's core—offers countless blue-hour compositions as modern cafes illuminate ancient archways.

What makes Croatian blue hour exceptional:

  • Illuminated fortifications - Medieval walls and towers glowing against Adriatic twilight
  • Harbor reflections - Rovinj, Hvar, and Korčula harbors mirror warm lights on calm water
  • Roman integration - Ancient architecture (Split's palace, Pula's arena) illuminated for night use
  • Coastal town cascades - Hillside villages create layered light displays descending to the sea

Best blue hour occurs during stable high-pressure systems when the Adriatic lies calm. Summer (June-August) offers blue hours around 8:30-9:30 PM with warm ambient temperatures. Spring and autumn provide earlier timing (7-8 PM) with fewer tourists. Arrive 45 minutes before sunset to scout compositions—the transition from golden hour to blue hour happens quickly in these latitudes.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Zagreb
Blue Hour
Any
Blue Hour Quality
≥ 65.0%
Precipitation Chance
≤ 15.0%
Sun, Feb 22
02:0011%0%
03:0011%0%
04:0011%0%
05:0011%0%
06:0075%0%
07:003.3%0%
08:003.6%0%
09:003.4%0%
10:003.6%0%
11:004%0%
12:004%0%
13:003.5%0%
14:002.7%0%
15:002.7%0%
16:002.4%0%
17:002.7%0%
18:0054%0%
19:008.1%0%
20:008.1%0%
21:008.3%0%
22:008.1%0%
23:008.1%0%
Mon, Feb 23
24:008.1%0%
01:008.1%0%
02:008.1%0%
03:008.1%0%
04:008.1%0%
05:008.1%0%
06:0050%0%
07:002.5%0%
08:002.5%0%
09:002.2%0%
10:002.9%0%
11:002.5%0%
12:002.3%0%
13:002.4%0%
14:002.3%0%
15:002.2%0%
16:002.2%0%
17:002%0%
18:0045%0%
19:006%0%
20:004.7%0%
21:004.7%0%
22:006%0%
23:004.6%0%
Tue, Feb 24
24:004.6%0%
01:004%0%
02:005.4%0%
03:004%0%
04:005.4%0%
05:005.4%0%
06:0036%0%
07:001.8%0%
08:001.3%0%
09:001.8%0%
10:002%0%
11:002%0%
12:002%0%
13:002%0%
14:002%0%
15:002%0%
16:002.5%0%
17:002.5%0%
18:0046%0%
19:006.9%0%
20:006.9%0%
21:006.9%0%
22:007.5%0%
23:0011%0%
Wed, Feb 25
24:0011%0%
01:0011%0%
02:0011%0%
03:0011%0%
04:0011%0%
05:0011%0%
06:0072%0%
07:003.5%0%
08:003.4%0%
09:003.4%0%
10:003.4%0%
11:003.4%0%
12:003.4%0%
13:003.4%0%
14:003.5%0%
15:003.7%0%
16:003.8%0%
17:003.8%0%
18:0075%0%
19:0011%0%
20:0011%0%
21:0011%0%
22:0011%0%
23:0011%0%
Thu, Feb 26
24:0011%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/Zagreb
Blue Hour
High Clouds
%
Low Clouds
%
Mid-Level Clouds
%
Relative Humidity
%
Solar Elevation
°
Total Cloud Coverage
%
Visibility
m
Wind Speed
m/s
Mon, Feb 23 Sunrise 06:54 Sunset 17:44
02:00
- 100% 0% 96% 74% -49° 100% 24134m 1.1m/s
03:00
- 100% 0% 100% 75% -41° 100% 24135m 1.2m/s
04:00
- 100% 1% 100% 75% -31° 100% 24134m 1.2m/s
05:00
- 100% 9% 100% 75% -21° 100% 24134m 1.2m/s
06:00
- 100% 2% 100% 75% -10° 100% 24134m 1.6m/s
07:00
- 100% 1% 100% 76% 0.66° 100% 24135m 1.6m/s
08:00
- 100% 6% 100% 76% 10° 100% 24134m 1.6m/s
09:00
- 100% 4% 0% 75% 19° 100% 24135m 1.4m/s
10:00
- 48% 12% 0% 72% 27° 48% 24135m 1.2m/s
11:00
- 29% 38% 0% 70% 32° 42% 24135m 0.49m/s
12:00
- 58% 27% 0% 70% 35° 60% 24135m 0.86m/s
13:00
- 31% 41% 0% 70% 34° 47% 24135m 1.4m/s
14:00
- 24% 48% 0% 71% 31° 52% 24134m 1.1m/s
15:00
- 92% 57% 0% 72% 24° 92% 24135m 1.1m/s
16:00
- 100% 42% 0% 74% 16° 100% 24135m 1.2m/s
17:00
- 100% 23% 0% 79% 6.8° 100% 24135m 0.96m/s
18:00
- 100% 11% 5% 82% -3.4° 100% 24135m 1.6m/s
19:00
- 100% 45% 77% 84% -14° 100% 24134m 1.2m/s
20:00
- 8% 52% 77% 84% -25° 77% 24135m 1.4m/s
21:00
- 33% 78% 21% 84% -35° 78% 24134m 1.4m/s
22:00
- 100% 89% 3% 83% -44° 100% 24134m 1.6m/s
23:00
- 100% 100% 0% 84% -51° 100% 24135m 1.2m/s
Tue, Feb 24 Sunrise 06:54 Sunset 17:44
24:00
- 94% 100% 0% 84% -54° 100% 24135m 0.97m/s
01:00
- 100% 100% 0% 85% -53° 100% 24134m 1.5m/s
02:00
- 100% 99% 0% 86% -48° 100% 24135m 0.92m/s
03:00
- 100% 100% 0% 87% -40° 100% 24134m 0.28m/s
04:00
- 100% 88% 2% 88% -31° 100% 24134m 0.37m/s
05:00
- 100% 74% 2% 88% -21° 100% 24135m 0.61m/s
06:00
- 100% 86% 2% 88% -9.9° 100% 24135m 0.78m/s
07:00
- 100% 91% 0% 88% 0.91° 100% 24135m 0.93m/s
08:00
- 100% 100% 2% 88% 11° 100% 24135m 0.97m/s
09:00
- 100% 98% 2% 87% 20° 100% 24135m 0.85m/s
10:00
- 100% 98% 4% 84% 27° 100% 24135m 0.64m/s
11:00
- 100% 99% 0% 81% 33° 100% 24134m 0.55m/s
12:00
- 100% 99% 1% 79% 35° 100% 24135m 0.63m/s
13:00
- 100% 94% 5% 77% 35° 100% 24135m 0.35m/s
14:00
- 100% 57% 52% 76% 31° 100% 24135m 0.3m/s
15:00
- 100% 27% 76% 76% 25° 100% 24135m 0.56m/s
16:00
- 100% 12% 56% 78% 16° 100% 24134m 0.69m/s
17:00
- 91% 10% 21% 83% 91% 24134m 0.79m/s
18:00
- 100% 3% 100% 86% -3.2° 100% 24134m 0.24m/s
19:00
- 100% 3% 100% 86% -14° 100% 24134m 0.85m/s
20:00
- 100% 2% 100% 86% -24° 100% 24135m 1.6m/s
21:00
- 100% 2% 100% 85% -34° 100% 24135m 1.5m/s
22:00
- 100% 2% 99% 84% -43° 100% 24134m 1.3m/s
23:00
- 0% 0% 5% 83% -50° 5% 24134m 1.4m/s
Wed, Feb 25 Sunrise 06:52 Sunset 17:45
24:00
- 0% 0% 1% 82% -54° 1% 24135m 1.6m/s
01:00
- 0% 0% 0% 81% -53° 0% 24134m 1.6m/s
02:00
- 2% 0% 0% 80% -48° 2% 24135m 1.7m/s
03:00
- 1% 0% 0% 80% -40° 1% 24135m 1.6m/s
04:00
- 2% 1% 0% 80% -31° 2% 24134m 1.7m/s
05:00
- 1% 2% 0% 80% -20° 2% 24135m 1.9m/s
06:00
- 2% 3% 0% 79% -9.6° 3% 24134m 1.8m/s
07:00
- 5% 3% 0% 79% 1.2° 5% 24135m 1.9m/s
08:00
- 3% 4% 0% 78% 11° 5% 24135m 2.3m/s
09:00
- 2% 4% 0% 78% 20° 5% 24135m 2.7m/s
10:00
- 0% 5% 0% 77% 28° 5% 24135m 3.1m/s
11:00
- 0% 5% 0% 77% 33° 5% 24135m 3m/s
12:00
- 0% 5% 0% 76% 36° 5% 24135m 2.9m/s
13:00
- 0% 5% 0% 76% 35° 5% 24135m 2.8m/s
14:00
- 0% 3% 0% 75% 31° 3% 24135m 2.7m/s
15:00
- 0% 2% 0% 74% 25° 2% 24135m 2.6m/s
16:00
- 0% 0% 0% 74% 17° 0% 24135m 2.5m/s
17:00
- 0% 0% 0% 74% 7.3° 0% 24135m 2.9m/s
18:00
- 0% 0% 0% 74% -3° 0% 24135m 3.2m/s
19:00
- 0% 0% 0% 74% -14° 0% 24135m 3.6m/s
20:00
- 0% 0% 0% 75% -24° 0% 24135m 3.6m/s
21:00
- 0% 0% 0% 76% -34° 0% 24135m 3.5m/s
22:00
- 0% 0% 0% 76% -43° 0% 24135m 3.5m/s
23:00
- 0% 0% 0% 77% -50° 0% 24135m 3.2m/s
Thu, Feb 26 Sunrise 06:50 Sunset 17:46
24:00
- 0% 0% 0% 78% -54° 0% 24135m 2.9m/s
01:00
- 0% 0% 0% 79% -53° 0% 24135m 2.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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