Rule
Blue Hour
Teijo - Blue Hour - Southern Finland
Matildedal, Southwest Finland, Finland
When city lights balance with the deep blue twilight sky
Currently
Real-time conditionsCloud Cover0%
Moon Altitude-10.1°
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in Europe/Helsinki
Next opportunity
Good Blue Hour (clear) at Sunrise
Teijo
Tomorrow · 05:40–05:58 · 1h window
High confidence
75%
🌉Blue Hour Quality79%
Cloud Cover: 5%
Moon Illumination: 47%
Moon Altitude: -2.1°
Good Blue Hour (clear) at Sunrise
Teijo
Sat, Apr 11 · 05:37–05:55
🌉Blue Hour Quality:79.3%
High
Good Blue Hour (clear) at Sunset
Teijo
Sat, Apr 11 · 21:05–21:23
🌉Blue Hour Quality:68.5%
Medium
What this forecast looks for
Plain-language explanation from the ruleSouthern Finland's architectural heritage and long Nordic twilight create exceptional blue hour photography opportunities. The extended transition between day and night—lasting up to 90 minutes in spring and autumn—provides ample time to work with artificial lighting balanced against deep blue skies.
What makes Southern Finland special for blue hour photography:
- Helsinki architecture - Senate Square's neoclassical buildings, Temppeliaukio Church, and Uspenski Cathedral lit against twilight skies
- Harbor scenes - Suomenlinna fortress and Helsinki's waterfront combine maritime elements with urban lighting
- Porvoo old town - Historic colored warehouses along Porvoonjoki river create postcard scenes during twilight
- Long twilight duration - Extended blue hour window compared to southern European locations
The combination of Baltic maritime influence and Nordic latitude means twilight lasts significantly longer than mid-latitude cities, giving you time to refine compositions as the light evolves. Helsinki's compact center allows photographers to move between multiple architectural subjects during a single blue hour session. Porvoo's riverside warehouses—painted in traditional ochre, red, and yellow—become luminous during twilight when building lights reflect in the river. The forecast tracks clear sky conditions and civil twilight timing to identify optimal blue hour opportunities.
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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/Helsinki | Blue Hour Any | Blue Hour Quality ≥ 65.0% | Precipitation Chance ≤ 15.0% |
|---|---|---|---|
| Thu, Apr 9 | |||
| 07:00 | ✕ | 3.8% | 0% |
| 08:00 | ✕ | 4% | 0% |
| 09:00 | ✕ | 4% | 0% |
| 10:00 | ✕ | 3.9% | 0% |
| 11:00 | ✕ | 3.8% | 0% |
| 12:00 | ✕ | 3.8% | 0% |
| 13:00 | ✕ | 3.5% | 0% |
| 14:00 | ✕ | 2.2% | 0% |
| 15:00 | ✕ | 2.2% | 0% |
| 16:00 | ✕ | 2.8% | 0% |
| 17:00 | ✕ | 2.5% | 0% |
| 18:00 | ✕ | 2.6% | 0% |
| 19:00 | ✕ | 2.7% | 0% |
| 20:00 | ✕ | 2.7% | 0% |
| 21:00 | ✓ | 49% | 0% |
| 22:00 | ✕ | 8.1% | 0% |
| 23:00 | ✕ | 9.7% | 0% |
| Fri, Apr 10 | |||
| 24:00 | ✕ | 12% | 0% |
| 01:00 | ✕ | 12% | 0% |
| 02:00 | ✕ | 12% | 0% |
| 03:00 | ✕ | 12% | 0% |
| 04:00 | ✕ | 12% | 0% |
| 05:00 | ✓ | 79% | 0% |
| 06:00 | ✕ | 71% | 0% |
| 07:00 | ✕ | 3.4% | 0% |
| 08:00 | ✕ | 2.7% | 0% |
| 09:00 | ✕ | 2.6% | 0% |
| 10:00 | ✕ | 2.7% | 0% |
| 11:00 | ✕ | 2.7% | 0% |
| 12:00 | ✕ | 2.8% | 0% |
| 13:00 | ✕ | 2.7% | 0% |
| 14:00 | ✕ | 1.9% | 0% |
| 15:00 | ✕ | 3.1% | 0% |
| 16:00 | ✕ | 3.6% | 0% |
| 17:00 | ✕ | 3.6% | 0% |
| 18:00 | ✕ | 2.9% | 0% |
| 19:00 | ✕ | 2.8% | 0% |
| 20:00 | ✕ | 3% | 0% |
| 21:00 | ✓ | 60% | 0% |
| 22:00 | ✕ | 8.8% | 0% |
| 23:00 | ✕ | 8.8% | 0% |
| Sat, Apr 11 | |||
| 24:00 | ✕ | 8.9% | 0% |
| 01:00 | ✕ | 6.7% | 0% |
| 02:00 | ✕ | 12% | 0% |
| 03:00 | ✕ | 12% | 0% |
| 04:00 | ✕ | 12% | 0% |
| 05:00 | ✓ | 79% | 0% |
| 06:00 | ✕ | 69% | 0% |
| 07:00 | ✕ | 4% | 0% |
| 08:00 | ✕ | 4% | 0% |
| 09:00 | ✕ | 4% | 0% |
| 10:00 | ✕ | 3.7% | 0% |
| 11:00 | ✕ | 3.7% | 0% |
| 12:00 | ✕ | 3.7% | 0% |
| 13:00 | ✕ | 3.4% | 0% |
| 14:00 | ✕ | 3.9% | 0% |
| 15:00 | ✕ | 3.9% | 0% |
| 16:00 | ✕ | 4% | 0% |
| 17:00 | ✕ | 3.7% | 0% |
| 18:00 | ✕ | 3.6% | 0% |
| 19:00 | ✕ | 3.5% | 0% |
| 20:00 | ✕ | 3.5% | 0% |
| 21:00 | ✓ | 69% | 0% |
| 22:00 | ✕ | 41% | 0% |
| 23:00 | ✕ | 9.7% | 0% |
| Sun, Apr 12 | |||
| 24:00 | ✕ | 9.7% | 0% |
| 01:00 | ✕ | 9.7% | 0% |
| 02:00 | ✕ | 9.2% | 0% |
| 03:00 | ✕ | 9.2% | 0% |
| 04:00 | ✕ | 8.6% | 0.3% |
| 05:00 | ✓ | 57% | 0.61% |
| 06:00 | ✕ | 52% | 0.91% |
| 07:00 | ✕ | 2.8% | 3.7% |
| 08:00 | ✕ | 2.8% | 6.5% |
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/Helsinki | Blue Hour | High Clouds % | Low Clouds % | Mid-Level Clouds % | Relative Humidity % | Solar Elevation ° | Total Cloud Coverage % | Visibility m | Wind Speed m/s |
|---|---|---|---|---|---|---|---|---|---|
| Thu, Apr 9
Sunrise 06:29
Sunset 20:31 | |||||||||
| 11:00 | - | 0% | 0% | 0% | 35% | 30° | 0% | 24135m | 3.6m/s |
| 12:00 | - | 2% | 0% | 0% | 30% | 35° | 2% | 24134m | 3.6m/s |
| 13:00 | - | 5% | 0% | 0% | 27% | 37° | 5% | 24135m | 3.5m/s |
| 14:00 | - | 100% | 0% | 0% | 26% | 37° | 100% | 24134m | 3.4m/s |
| 15:00 | - | 100% | 0% | 0% | 26% | 35° | 100% | 24134m | 3.2m/s |
| 16:00 | - | 42% | 0% | 1% | 26% | 30° | 42% | 24135m | 2.9m/s |
| 17:00 | - | 56% | 0% | 1% | 29% | 25° | 56% | 24135m | 2.3m/s |
| 18:00 | - | 100% | 0% | 2% | 35% | 18° | 100% | 24135m | 2m/s |
| 19:00 | - | 100% | 0% | 0% | 51% | 11° | 100% | 24134m | 2.5m/s |
| 20:00 | - | 100% | 0% | 0% | 64% | 3.3° | 100% | 24135m | 1.9m/s |
| 21:00 ☾ | - | 96% | 0% | 0% | 68% | -4° | 96% | 24135m | 0.34m/s |
| 22:00 ☾ | - | 56% | 0% | 0% | 68% | -10° | 56% | 24135m | 0.75m/s |
| 23:00 ☾ | - | 8% | 0% | 0% | 66% | -16° | 8% | 24135m | 1.4m/s |
| Fri, Apr 10
Sunrise 06:29
Sunset 20:31 | |||||||||
| 24:00 ☾ | - | 5% | 0% | 0% | 64% | -20° | 5% | 24134m | 1.7m/s |
| 01:00 ☾ | - | 5% | 0% | 0% | 62% | -22° | 5% | 24134m | 1.9m/s |
| 02:00 ☾ | - | 5% | 0% | 0% | 61% | -22° | 5% | 24135m | 2m/s |
| 03:00 ☾ | - | 5% | 0% | 0% | 62% | -20° | 5% | 24134m | 2m/s |
| 04:00 ☾ | - | 5% | 0% | 0% | 63% | -16° | 5% | 24135m | 1.9m/s |
| 05:00 ☾ | - | 5% | 0% | 0% | 63% | -10° | 5% | 24135m | 1.9m/s |
| 06:00 ☾ | - | 5% | 0% | 0% | 63% | -3.8° | 5% | 24135m | 2m/s |
| 07:00 | - | 36% | 0% | 0% | 62% | 3.4° | 36% | 24134m | 2m/s |
| 08:00 | - | 74% | 0% | 1% | 55% | 11° | 74% | 24135m | 2.2m/s |
| 09:00 | - | 95% | 0% | 11% | 46% | 18° | 95% | 24135m | 2.7m/s |
| 10:00 | - | 100% | 0% | 100% | 40% | 25° | 100% | 24134m | 2.6m/s |
| 11:00 | - | 100% | 0% | 100% | 36% | 31° | 100% | 24134m | 2.4m/s |
| 12:00 | - | 100% | 0% | 100% | 34% | 35° | 100% | 24135m | 2m/s |
| 13:00 | - | 62% | 0% | 100% | 32% | 38° | 100% | 24135m | 2.1m/s |
| 14:00 | - | 5% | 0% | 92% | 32% | 38° | 92% | 24135m | 2m/s |
| 15:00 | - | 5% | 0% | 10% | 30% | 35° | 10% | 24135m | 1.7m/s |
| 16:00 | - | 5% | 0% | 4% | 29% | 31° | 5% | 24135m | 1.8m/s |
| 17:00 | - | 5% | 0% | 0% | 28% | 25° | 5% | 24134m | 1.9m/s |
| 18:00 | - | 41% | 0% | 3% | 28% | 18° | 41% | 24135m | 1.8m/s |
| 19:00 | - | 100% | 0% | 100% | 39% | 11° | 100% | 24134m | 1.2m/s |
| 20:00 | - | 100% | 0% | 100% | 50% | 3.5° | 100% | 24135m | 1.5m/s |
| 21:00 ☾ | - | 100% | 0% | 100% | 58% | -3.7° | 100% | 24134m | 1.5m/s |
| 22:00 ☾ | - | 100% | 0% | 100% | 62% | -10° | 100% | 24135m | 1.4m/s |
| 23:00 ☾ | - | 100% | 0% | 100% | 61% | -15° | 100% | 24135m | 0.72m/s |
| Sat, Apr 11
Sunrise 06:26
Sunset 20:34 | |||||||||
| 24:00 ☾ | - | 100% | 0% | 100% | 58% | -19° | 100% | 24134m | 0.88m/s |
| 01:00 ☾ | - | 11% | 0% | 66% | 58% | -21° | 66% | 24135m | 1.6m/s |
| 02:00 ☾ | - | 0% | 0% | 0% | 59% | -21° | 0% | 24135m | 2m/s |
| 03:00 ☾ | - | 0% | 0% | 0% | 60% | -19° | 0% | 24134m | 2m/s |
| 04:00 ☾ | - | 0% | 0% | 0% | 62% | -15° | 0% | 24135m | 2m/s |
| 05:00 ☾ | - | 0% | 0% | 0% | 63% | -10° | 0% | 24134m | 2.1m/s |
| 06:00 ☾ | - | 5% | 0% | 0% | 64% | -3.5° | 5% | 24135m | 2.1m/s |
| 07:00 | - | 0% | 0% | 0% | 64% | 3.8° | 0% | 24134m | 2.1m/s |
| 08:00 | - | 0% | 0% | 0% | 57% | 11° | 0% | 24135m | 2.5m/s |
| 09:00 | - | 0% | 0% | 0% | 46% | 18° | 0% | 24135m | 3.2m/s |
| 10:00 | - | 5% | 0% | 0% | 40% | 25° | 5% | 24134m | 3.1m/s |
| 11:00 | - | 5% | 0% | 0% | 37% | 31° | 5% | 24134m | 3.2m/s |
| 12:00 | - | 5% | 0% | 0% | 38% | 36° | 5% | 24134m | 3.5m/s |
| 13:00 | - | 10% | 0% | 0% | 41% | 38° | 10% | 24135m | 3.4m/s |
| 14:00 | - | 5% | 4% | 5% | 42% | 38° | 5% | 24135m | 3.4m/s |
| 15:00 | - | 5% | 5% | 0% | 43% | 36° | 5% | 24134m | 3.3m/s |
| 16:00 | - | 3% | 3% | 0% | 55% | 31° | 3% | 24134m | 3.2m/s |
| 17:00 | - | 2% | 2% | 0% | 67% | 25° | 2% | 24135m | 3.2m/s |
| 18:00 | - | 0% | 0% | 0% | 78% | 18° | 0% | 24135m | 3.2m/s |
| 19:00 | - | 0% | 2% | 0% | 79% | 11° | 2% | 24135m | 3.3m/s |
| 20:00 | - | 0% | 3% | 0% | 80% | 3.8° | 3% | 24135m | 3.5m/s |
| 21:00 ☾ | - | 0% | 5% | 0% | 81% | -3.4° | 5% | 24135m | 3.7m/s |
| 22:00 ☾ | - | 1% | 5% | 0% | 84% | -9.8° | 5% | 24135m | 3.6m/s |
| 23:00 ☾ | - | 2% | 5% | 0% | 87% | -15° | 5% | 24135m | 3.6m/s |
| Sun, Apr 12
Sunrise 06:23
Sunset 20:36 | |||||||||
| 24:00 ☾ | - | 3% | 5% | 0% | 90% | -19° | 5% | 24135m | 3.5m/s |
| 01:00 ☾ | - | 4% | 5% | 2% | 89% | -21° | 5% | 24135m | 3.8m/s |
| 02:00 ☾ | - | 4% | 5% | 3% | 87% | -21° | 5% | 24135m | 4.1m/s |
| 03:00 ☾ | - | 5% | 5% | 5% | 85% | -19° | 5% | 24135m | 4.4m/s |
| 04:00 ☾ | - | 5% | 5% | 5% | 84% | -15° | 5% | 24135m | 4.4m/s |
| 05:00 ☾ | - | 5% | 5% | 5% | 83% | -9.6° | 5% | 24135m | 4.4m/s |
| 06:00 ☾ | - | 5% | 5% | 5% | 81% | -3.1° | 5% | 24135m | 4.5m/s |
| 07:00 | - | 5% | 6% | 6% | 81% | 4.1° | 6% | 24135m | 4.7m/s |
| 08:00 | - | 5% | 6% | 7% | 80% | 11° | 7% | 24135m | 4.9m/s |
| 09:00 | - | 5% | 7% | 7% | 79% | 19° | 8% | 24135m | 5.2m/s |
| 10:00 | - | 4% | 24% | 6% | 80% | 26° | 25% | 24135m | 5.1m/s |
How to read: these inputs help produce the derived score; they are not requirements by themselves.
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