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Rule Mirror Lake

Beddgelert - Mirror Lake - Snowdonia (Eryri)

Beddgelert, Wales, United Kingdom

Perfectly calm water for flawless reflections

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
mirror-lake weather icon
Next opportunity
Perfect Mirror Reflections
Beddgelert
Tomorrow · 04:00–05:00 · 1h window
Medium confidence
57%
💨Wind Speed1m/s
mirror-lake weather icon
Perfect Mirror Reflections at Dawn
Beddgelert
Tomorrow · 05:00–06:00
💨Wind Speed:1m/s
Medium
mirror-lake weather icon
Perfect Mirror Reflections at Sunrise
Beddgelert
Tomorrow · 06:00–07:00
💨Wind Speed:0.8m/s
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast identifies when calm conditions and clear skies align for perfect mirror reflections on Snowdonia's mountain lakes. We track wind speed, cloud cover, and atmospheric stability to predict when Llyn Padarn, Llyn Ogwen, and other tarns become mirror-still.

Snowdonia's glacial lakes—scoured by Ice Age glaciers into deep mountain-flanked basins—create some of Wales's most iconic reflection photography. Llyn Padarn reflects the Snowdon massif and historic Dolbadarn Castle, Llyn Ogwen mirrors Tryfan's distinctive rocky profile, and smaller tarns throughout the national park offer intimate reflection compositions with dramatic mountain backdrops.

What makes Snowdonia reflection photography distinctive:

  • Snowdon massif - Llyn Padarn and Llyn Gwynant reflect Wales's highest peaks with morning alpenglow
  • Tryfan's profile - Llyn Ogwen mirrors the distinctive rocky north face and three prominent buttresses
  • Historic elements - Dolbadarn Castle tower reflected in Llyn Padarn adds medieval narrative
  • Glacial tarns - Cwm Idwal and mountain pools create intimate reflection compositions in cirques

The most reliable reflection conditions occur during settled high-pressure periods, particularly in autumn (September-November) when winds are calmer than spring and summer. Dawn offers the best chance of mirror-calm before valley winds develop—Llyn Padarn is typically stillest in the hour after sunrise. The lake's eastern orientation means morning light illuminates the Snowdon massif beautifully while water remains calm. Llyn Ogwen requires careful timing—its exposed position means wind-free mornings are precious. Position yourself at the eastern end near the Ogwen Cottage climbing hut to capture Tryfan's full profile reflected in calm water. Capel Curig's smaller pools offer intimate reflection opportunities with less exposure to wind. Nant Gwynant valley's Llyn Gwynant reflects surrounding peaks with particularly calm conditions in its sheltered upper reaches. Winter and spring mornings occasionally deliver snow-covered peaks reflected in dark water—one of Snowdonia's signature compositions.

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72-hour requirements breakdown

What passed or failed, hour by hour
4matching hours in the next 91 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Wind Speed
≤ 1.0m/s
Wind Gusts
≤ 2.0m/s
Precipitation Chance
≤ 10.0%
Visibility
≥ 5000.0m
Wed, Apr 8
06:001.5m/s1.5m/s0%24134m
07:001.2m/s1.2m/s0%24135m
08:000.91m/s1m/s0%24135m
09:001.5m/s1.7m/s0%24134m
10:001.9m/s2m/s0%24135m
11:002.2m/s2.1m/s0%24134m
12:002.3m/s2.2m/s0%23864m
13:002.9m/s3m/s0%23858m
14:003.5m/s3.9m/s0%23861m
15:003.4m/s3.8m/s0%23863m
16:003.5m/s4.1m/s0%23864m
17:003.6m/s4.4m/s0%23869m
18:003.4m/s4.2m/s0%23991m
19:002.9m/s4.2m/s0%24135m
20:002.5m/s3.5m/s0%22420m
21:002.5m/s3.3m/s0%22266m
22:002.3m/s2.6m/s0%24134m
23:002.5m/s4.8m/s0%1778m
Thu, Apr 9
24:002.9m/s6.4m/s0%235m
01:003.9m/s7.1m/s0%1036m
02:004.4m/s7.6m/s33%1960m
03:004.4m/s8.4m/s66%24135m
04:004.5m/s9.8m/s100%24135m
05:004.9m/s10m/s100%22596m
06:006.4m/s12m/s100%3398m
07:005.9m/s13m/s100%2787m
08:005.7m/s12m/s99%248m
09:005.3m/s11m/s98%122m
10:004.4m/s9.8m/s96%140m
11:005.2m/s9.4m/s96%23584m
12:006.7m/s9.7m/s97%24135m
13:008.3m/s10m/s97%6035m
14:007.5m/s10m/s72%23395m
15:008.1m/s10m/s47%2987m
16:007.6m/s11m/s22%24135m
17:008.1m/s12m/s36%23620m
18:007.5m/s11m/s50%24126m
19:007.5m/s12m/s64%24135m
20:005.6m/s11m/s43%24135m
21:005.4m/s11m/s21%24134m
22:005m/s11m/s0%24134m
23:005.1m/s11m/s0%24135m
Fri, Apr 10
24:004.3m/s10m/s0%24134m
01:003.9m/s9.6m/s0%24135m
02:002.4m/s6.9m/s0%24134m
03:001.6m/s1.7m/s0%24134m
04:000.96m/s1m/s0%24135m
05:000.96m/s1m/s0%24134m
06:000.83m/s0.8m/s0%24134m
07:001.2m/s1.1m/s0%24135m
08:001.6m/s2m/s17%24134m
09:002.1m/s3.1m/s33%24134m
10:002.2m/s3.4m/s50%24135m
11:003m/s5m/s58%24135m
12:003.8m/s5.7m/s66%24134m
13:004.3m/s6.8m/s74%24134m
14:004.5m/s7.4m/s59%24134m
15:004.1m/s7.7m/s45%5412m
16:004m/s7.9m/s30%5702m
17:003.6m/s8.6m/s41%7698m
18:003.7m/s9.1m/s51%13254m
19:003.3m/s10m/s62%2460m
20:005m/s12m/s74%22552m
21:005m/s13m/s86%2814m
22:005.8m/s16m/s97%6948m
23:005.7m/s16m/s98%23998m
Sat, Apr 11
24:006.2m/s17m/s99%9714m
01:007.3m/s19m/s100%13602m
02:008.1m/s16m/s86%602m
03:007.1m/s15m/s73%340m
04:009.5m/s15m/s59%24135m
05:009.7m/s15m/s61%24135m
06:009.3m/s15m/s64%10094m
07:007.8m/s12m/s66%24135m
08:007.8m/s13m/s60%17284m
09:007.9m/s15m/s55%10433m
10:008m/s16m/s49%3582m
11:009.2m/s17m/s63%10106m
12:0010m/s18m/s77%16629m
13:0012m/s19m/s90%23153m
14:0012m/s19m/s91%18326m
15:0012m/s18m/s91%13500m
16:0012m/s18m/s92%8673m
17:0012m/s18m/s93%7203m
18:0012m/s18m/s94%5732m
19:0012m/s17m/s96%4261m
20:0011m/s16m/s89%5793m
21:009.9m/s16m/s82%7324m
22:009m/s15m/s75%8856m
23:008.3m/s14m/s81%8942m
Sun, Apr 12
24:007.5m/s13m/s87%9028m
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

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