Rule
Blue Hour
Sintra - Blue Hour - Algarve, Portugal
Sintra, Lisbon, Portugal
When city lights balance with the deep blue twilight sky
Currently
Real-time conditionsCloud Cover78%
Moon Altitude77.3°
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in Europe/Lisbon
Next opportunity
Good Blue Hour (clear) at Sunset
Sintra
Today · 21:03–21:15 · 1h window
Medium confidence
68%
🌉Blue Hour Quality70.9%
Cloud Cover: 0%
Moon Illumination: 0%
Moon Altitude: 11.3°
Good Blue Hour (clear) at Sunset
Sintra
Wed, May 20 · 21:06–21:18
🌉Blue Hour Quality:71%
Medium
Good Blue Hour (clear) at Sunrise
Sintra
Thu, May 21 · 06:00–06:01
🌉Blue Hour Quality:72.4%
Medium
What this forecast looks for
Plain-language explanation from the ruleAlgarve's historic coastal towns transform during the blue hour, when their whitewashed architecture and Moorish influences become illuminated against the deepening Atlantic twilight. The warm glow of street lights and restaurants creates a perfect color contrast with the cool blue sky.
Tavira's Roman bridge and church towers reflect in the Gilão River, doubling their visual impact during the calm blue hour when wind typically drops. Faro's old town (Cidade Velha) with its cathedral and surrounding defensive walls becomes a glowing jewel against the darkening sky.
What makes Algarve blue hour special:
- Moorish architecture - Islamic influence visible in arches, tiles, and whitewashed walls that glow at twilight
- River reflections - Tavira and Silves offer mirror-calm water during windless blue hours
- Fishing harbors - Traditional boats and colorful harbors in Olhão and Alvor
- Coastal village lights - Carvoeiro and Albufeira cascade down cliffs, creating layered light displays
The extended Mediterranean-influenced twilight provides 30-40 minutes of usable blue hour light. Winter blue hours (around 6-7 PM) often feature clearer skies, while summer (9-10 PM) offers warmer ambient temperatures for comfortable shooting. Arrive early to scout compositions—the transition from golden hour to blue hour happens quickly.
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72-hour requirements breakdown
What passed or failed, hour by hourAND logic: all conditions required
Meets requirement
Misses requirement
Time Europe/Lisbon | Blue Hour Any | Blue Hour Quality ≥ 65.0% | Precipitation Chance ≤ 15.0% |
|---|---|---|---|
| Sat, May 16 | |||
| 14:00 | ✕ | 29% | 0% |
| 15:00 | ✕ | 31% | 0% |
| 16:00 | ✕ | 23% | 0% |
| 17:00 | ✕ | 26% | 0% |
| 18:00 | ✕ | 23% | 0% |
| 19:00 | ✕ | 26% | 0% |
| 20:00 | ✕ | 26% | 2.8% |
| 21:00 | ✓ | 66% | 5.5% |
| 22:00 | ✕ | 31% | 8.3% |
| 23:00 | ✕ | 29% | 19% |
| Sun, May 17 | |||
| 24:00 | ✕ | 28% | 29% |
| 01:00 | ✕ | 29% | 39% |
| 02:00 | ✕ | 26% | 26% |
| 03:00 | ✕ | 27% | 13% |
| 04:00 | ✕ | 27% | 0% |
| 05:00 | ✓ | 51% | 13% |
| 06:00 | ✓ | 37% | 26% |
| 07:00 | ✕ | 26% | 39% |
| 08:00 | ✕ | 26% | 26% |
| 09:00 | ✕ | 23% | 13% |
| 10:00 | ✕ | 19% | 0% |
| 11:00 | ✕ | 23% | 0% |
| 12:00 | ✕ | 23% | 0% |
| 13:00 | ✕ | 22% | 0% |
| 14:00 | ✕ | 22% | 0% |
| 15:00 | ✕ | 30% | 0% |
| 16:00 | ✕ | 26% | 0% |
| 17:00 | ✕ | 28% | 0% |
| 18:00 | ✕ | 23% | 0% |
| 19:00 | ✕ | 26% | 0% |
| 20:00 | ✕ | 26% | 0% |
| 21:00 | ✓ | 71% | 0% |
| 22:00 | ✕ | 34% | 0% |
| 23:00 | ✕ | 29% | 0% |
| Mon, May 18 | |||
| 24:00 | ✕ | 27% | 0% |
| 01:00 | ✕ | 30% | 0% |
| 02:00 | ✕ | 27% | 0% |
| 03:00 | ✕ | 34% | 0% |
| 04:00 | ✕ | 27% | 0% |
| 05:00 | ✓ | 52% | 0% |
| 06:00 | ✓ | 51% | 0% |
| 07:00 | ✕ | 24% | 0% |
| 08:00 | ✕ | 26% | 0% |
| 09:00 | ✕ | 26% | 0% |
| 10:00 | ✕ | 26% | 0% |
| 11:00 | ✕ | 26% | 0% |
| 12:00 | ✕ | 26% | 0% |
| 13:00 | ✕ | 30% | 0% |
| 14:00 | ✕ | 27% | 0% |
| 15:00 | ✕ | 31% | 0% |
| 16:00 | ✕ | 26% | 0% |
| 17:00 | ✕ | 26% | 0% |
| 18:00 | ✕ | 26% | 0% |
| 19:00 | ✕ | 26% | 0% |
| 20:00 | ✕ | 26% | 0% |
| 21:00 | ✓ | 54% | 0% |
| 22:00 | ✕ | 27% | 0% |
| 23:00 | ✕ | 27% | 0% |
| Tue, May 19 | |||
| 24:00 | ✕ | 27% | 0% |
| 01:00 | ✕ | 27% | 0% |
| 02:00 | ✕ | 28% | 0% |
| 03:00 | ✕ | 19% | 0% |
| 04:00 | ✕ | 22% | 0% |
| 05:00 | ✓ | 61% | 0% |
| 06:00 | ✓ | 61% | 0% |
| 07:00 | ✕ | 25% | 0% |
| 08:00 | ✕ | 27% | 0% |
| 09:00 | ✕ | 27% | 0% |
| 10:00 | ✕ | 25% | 0% |
| 11:00 | ✕ | 25% | 0% |
| 12:00 | ✕ | 21% | 0% |
| 13:00 | ✕ | 26% | 0% |
| 14:00 | ✕ | 27% | 0% |
| 15:00 | ✕ | 27% | 0% |
| 16:00 | ✕ | 27% | 0% |
| 17:00 | ✕ | 24% | 0% |
| 18:00 | ✕ | 24% | 0% |
| 19:00 | ✕ | 24% | 0% |
| 20:00 | ✕ | 1.7% | 0% |
| 21:00 | ✓ | 42% | 0% |
| 22:00 | ✕ | 8.6% | 0% |
| 23:00 | ✕ | 8.6% | 0% |
| Wed, May 20 | |||
| 24:00 | ✕ | 8.6% | 0% |
| 01:00 | ✕ | 8.6% | 0% |
| 02:00 | ✕ | 9.4% | 0% |
| 03:00 | ✕ | 9.6% | 0% |
| 04:00 | ✕ | 9.7% | 0% |
| 05:00 | ✓ | 56% | 0% |
| 06:00 | ✓ | 56% | 0% |
| 07:00 | ✕ | 3.3% | 0% |
| 08:00 | ✕ | 2.7% | 0% |
| 09:00 | ✕ | 2.4% | 0% |
| 10:00 | ✕ | 2.3% | 0% |
| 11:00 | ✕ | 2.4% | 0% |
| 12:00 | ✕ | 2.5% | 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 scoreThis 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/Lisbon | Blue Hour | High Clouds % | Low Clouds % | Mid-Level Clouds % | Relative Humidity % | Solar Elevation ° | Total Cloud Coverage % | Visibility m | Wind Speed m/s |
|---|---|---|---|---|---|---|---|---|---|
| Sun, May 17
Sunrise 06:23
Sunset 20:44 | |||||||||
| 14:00 | - | 78% | 2% | 13% | 77% | 70° | 78% | 24135m | 7.8m/s |
| 15:00 | - | 12% | 0% | 4% | 75% | 63° | 12% | 24135m | 8m/s |
| 16:00 | - | 0% | 0% | 0% | 71% | 53° | 0% | 24134m | 8.6m/s |
| 17:00 | - | 1% | 0% | 0% | 69% | 42° | 1% | 24134m | 8.7m/s |
| 18:00 | - | 0% | 0% | 0% | 70% | 30° | 0% | 24134m | 9m/s |
| 19:00 | - | 0% | 0% | 0% | 71% | 19° | 0% | 24135m | 9.5m/s |
| 20:00 | - | 0% | 0% | 0% | 73% | 7.3° | 0% | 24134m | 9.9m/s |
| 21:00 ☾ | - | 0% | 0% | 0% | 72% | -3.4° | 0% | 24135m | 9.3m/s |
| 22:00 ☾ | - | 38% | 1% | 0% | 74% | -13° | 38% | 24135m | 9.5m/s |
| 23:00 ☾ | - | 18% | 0% | 0% | 74% | -21° | 18% | 24135m | 9.7m/s |
| Mon, May 18
Sunrise 06:23
Sunset 20:44 | |||||||||
| 24:00 ☾ | - | 100% | 0% | 0% | 73% | -28° | 100% | 24134m | 8.9m/s |
| 01:00 ☾ | - | 12% | 0% | 0% | 73% | -31° | 12% | 24135m | 8.6m/s |
| 02:00 ☾ | - | 100% | 0% | 85% | 73% | -31° | 100% | 24134m | 8.3m/s |
| 03:00 ☾ | - | 5% | 0% | 1% | 73% | -28° | 5% | 24135m | 8.3m/s |
| 04:00 ☾ | - | 53% | 0% | 0% | 73% | -22° | 53% | 24135m | 8.2m/s |
| 05:00 ☾ | - | 100% | 0% | 0% | 73% | -14° | 100% | 24135m | 8m/s |
| 06:00 ☾ | - | 84% | 0% | 0% | 74% | -4.7° | 84% | 24134m | 7.6m/s |
| 07:00 | - | 84% | 0% | 0% | 74% | 6° | 84% | 24135m | 7m/s |
| 08:00 | - | 100% | 1% | 0% | 73% | 17° | 100% | 24134m | 6.9m/s |
| 09:00 | - | 100% | 0% | 0% | 73% | 29° | 100% | 24135m | 6.7m/s |
| 10:00 | - | 85% | 0% | 1% | 72% | 40° | 85% | 24135m | 6.2m/s |
| 11:00 | - | 100% | 1% | 42% | 72% | 52° | 100% | 24134m | 5.8m/s |
| 12:00 | - | 77% | 0% | 62% | 72% | 62° | 77% | 24134m | 5.4m/s |
| 13:00 | - | 33% | 0% | 5% | 72% | 69° | 33% | 24134m | 5.6m/s |
| 14:00 | - | 88% | 0% | 3% | 72% | 70° | 88% | 24135m | 5.6m/s |
| 15:00 | - | 6% | 0% | 5% | 72% | 63° | 6% | 24134m | 5.7m/s |
| 16:00 | - | 86% | 0% | 5% | 72% | 53° | 86% | 24135m | 5.8m/s |
| 17:00 | - | 100% | 0% | 5% | 72% | 42° | 100% | 24134m | 6.2m/s |
| 18:00 | - | 100% | 0% | 35% | 72% | 30° | 100% | 24135m | 5.5m/s |
| 19:00 | - | 100% | 0% | 100% | 72% | 19° | 100% | 24135m | 5.4m/s |
| 20:00 | - | 100% | 0% | 100% | 73% | 7.5° | 100% | 24135m | 5.3m/s |
| 21:00 ☾ | - | 100% | 2% | 96% | 77% | -3.2° | 100% | 24135m | 5.4m/s |
| 22:00 ☾ | - | 100% | 5% | 100% | 80% | -13° | 100% | 24135m | 5.2m/s |
| 23:00 ☾ | - | 100% | 8% | 100% | 84% | -21° | 100% | 24135m | 4.6m/s |
| Tue, May 19
Sunrise 06:23
Sunset 20:45 | |||||||||
| 24:00 ☾ | - | 88% | 8% | 100% | 85% | -27° | 100% | 24135m | 3.5m/s |
| 01:00 ☾ | - | 98% | 8% | 93% | 86% | -31° | 98% | 24134m | 2.9m/s |
| 02:00 ☾ | - | 21% | 8% | 5% | 88% | -31° | 26% | 24135m | 3.1m/s |
| 03:00 ☾ | - | 0% | 29% | 5% | 89% | -28° | 29% | 24135m | 3.9m/s |
| 04:00 ☾ | - | 0% | 11% | 5% | 90% | -22° | 11% | 24135m | 3.3m/s |
| 05:00 ☾ | - | 1% | 7% | 5% | 91% | -14° | 7% | 24134m | 2.6m/s |
| 06:00 ☾ | - | 5% | 7% | 5% | 91% | -4.5° | 7% | 24135m | 2.8m/s |
| 07:00 | - | 5% | 6% | 5% | 91% | 6.1° | 6% | 24135m | 2.9m/s |
| 08:00 | - | 5% | 5% | 0% | 89% | 17° | 5% | 24134m | 2.6m/s |
| 09:00 | - | 5% | 5% | 0% | 87% | 29° | 5% | 24134m | 2.5m/s |
| 10:00 | - | 5% | 3% | 0% | 84% | 40° | 5% | 24134m | 3m/s |
| 11:00 | - | 4% | 2% | 0% | 84% | 52° | 5% | 24134m | 4.2m/s |
| 12:00 | - | 5% | 5% | 0% | 84% | 62° | 8% | 18042m | 5.5m/s |
| 13:00 | - | 7% | 5% | 0% | 85% | 70° | 9% | 18045m | 6.6m/s |
| 14:00 | - | 8% | 5% | 0% | 86% | 70° | 9% | 18044m | 7.5m/s |
| 15:00 | - | 6% | 4% | 0% | 86% | 63° | 8% | 18051m | 7.5m/s |
| 16:00 | - | 20% | 4% | 0% | 86% | 53° | 20% | 18377m | 7.6m/s |
| 17:00 | - | 65% | 4% | 0% | 87% | 42° | 65% | 18448m | 7.6m/s |
| 18:00 | - | 73% | 4% | 0% | 87% | 30° | 73% | 19714m | 8m/s |
| 19:00 | - | 100% | 1% | 0% | 88% | 19° | 100% | 24135m | 8.1m/s |
| 20:00 | - | 75% | 0% | 0% | 89% | 7.6° | 75% | 24135m | 7.3m/s |
| 21:00 ☾ | - | 50% | 0% | 0% | 89% | -3.1° | 50% | 24135m | 6.6m/s |
| 22:00 ☾ | - | 25% | 0% | 0% | 90% | -13° | 25% | 24135m | 5.8m/s |
| 23:00 ☾ | - | 25% | 0% | 0% | 89% | -21° | 25% | 24135m | 5.6m/s |
| Wed, May 20
Sunrise 06:22
Sunset 20:46 | |||||||||
| 24:00 ☾ | - | 25% | 0% | 0% | 88% | -27° | 25% | 24135m | 5.4m/s |
| 01:00 ☾ | - | 24% | 0% | 0% | 87% | -31° | 24% | 24135m | 5.2m/s |
| 02:00 ☾ | - | 22% | 0% | 0% | 83% | -31° | 22% | 24135m | 4.8m/s |
| 03:00 ☾ | - | 19% | 0% | 0% | 80% | -28° | 19% | 24135m | 4.4m/s |
| 04:00 ☾ | - | 16% | 0% | 0% | 77% | -22° | 16% | 24135m | 4m/s |
| 05:00 ☾ | - | 13% | 0% | 0% | 79% | -14° | 13% | 24135m | 4.4m/s |
| 06:00 ☾ | - | 9% | 0% | 0% | 81% | -4.4° | 9% | 24135m | 4.8m/s |
| 07:00 | - | 5% | 0% | 0% | 84% | 6.2° | 5% | 24135m | 5.2m/s |
| 08:00 | - | 3% | 4% | 0% | 85% | 17° | 7% | 19742m | 5.3m/s |
| 09:00 | - | 2% | 8% | 0% | 85% | 29° | 9% | 15348m | 5.4m/s |
| 10:00 | - | 0% | 11% | 0% | 86% | 41° | 11% | 10955m | 5.6m/s |
| 11:00 | - | 1% | 8% | 0% | 87% | 52° | 9% | 15348m | 5.2m/s |
| 12:00 | - | 2% | 4% | 0% | 87% | 62° | 6% | 19742m | 4.8m/s |
| 13:00 | - | 3% | 0% | 0% | 87% | 70° | 3% | 24135m | 4.4m/s |
How to read: these inputs help produce the derived score; they are not requirements by themselves.
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