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Rule Fog Hunter

San José - Fog Hunter - Costa Rica

San José, Provincia de San José, Costa Rica

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread1.0°C
Visibility336 (Fog)
Relative Humidity94%
Wind Speed2.1m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Costa_Rica
fog weather icon
Next opportunity
Moderate Fog
San José
Today · 20:00–22:00 · 2h window
Medium confidence
56%
🌫️Fog Probability66.7-77.1%
Dewpoint Spread: 0.5°C
Visibility: 114 (Dense fog)
Relative Humidity: 97%
Wind Speed: 2.0m/s (calm conditions)
fog weather icon
Moderate Fog
San José
Fri, Apr 10 · 03:00–05:00
🌫️Fog Probability:64.9-71.6%
Low
fog weather icon
Moderate Fog at Sunrise
San José
Fri, Apr 10 · 05:00–06:00
🌫️Fog Probability:73.8%
Medium
fog weather icon
Dense Fog
San José
Fri, Apr 10 · 19:00–22:00
🌫️Fog Probability:80.4-92.3%
High
fog weather icon
Moderate Fog
San José
Sat, Apr 11 · 18:00–01:00
🌫️Fog Probability:60.4-80.4%
Low
fog weather icon
Moderate Fog
San José
Thu, Apr 16 · 15:00–17:00
🌫️Fog Probability:64.8-74.8%
Low
fog weather icon
Moderate Fog
San José
Fri, Apr 17 · 15:00–17:00
🌫️Fog Probability:63.8%
Low
+2 more windows in the next 10 days

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts when cloud forest conditions and valley fog create atmospheric scenes across Costa Rica's diverse elevations and microclimates. We track elevation-specific humidity, temperature differentials, and wind patterns to identify when fog and mist transform rainforest, cloud forest, and volcanic landscapes.

Costa Rica's dramatic topography creates numerous fog microclimates—from Monteverde's perpetual cloud forest mist to volcanic valley inversions to Caribbean coastal morning fog. The collision of Pacific and Caribbean weather systems over mountainous terrain produces exceptional fog photography opportunities year-round, with green season (May-November) bringing the most dramatic conditions.

What makes Costa Rica fog photography special:

  • Cloud forest immersion - Monteverde's permanent fog layer supports epiphyte-draped forests where mist is the defining feature, not occasional visitor
  • Volcanic valley fog - Arenal and Turrialba valleys fill with morning fog while volcanic peaks emerge above inversion layers
  • Microclimate transitions - Experience multiple fog types in single day—cloud forest, valley fog, coastal mist across short distances
  • Jungle emergence - Rainforest canopy trees and cecropia emerging from morning fog layers create layered atmospheric compositions

Monteverde cloud forest reserve exists because of fog—the persistent cloud layer that supports one of Earth's most biodiverse ecosystems. Here, photography captures fog as environment, with epiphytes, bromeliads, and moss-draped trees emerging from perpetual mist. The suspended bridges offer unique elevated perspectives into the fog layer. From La Fortuna, Arenal Volcano's perfect cone rises above valley fog on calm mornings, especially during green season. Turrialba Valley experiences similar inversions with the active volcano emerging above fog pools. Rincón de la Vieja's volcanic slopes create altitude-based fog layers with fumaroles adding volcanic steam to natural mist. Best conditions occur during green season when humidity is highest—arrive early as valley fog often dissipates by 8-9 AM.

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72-hour requirements breakdown

What passed or failed, hour by hour
13matching hours in the next 91 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Costa_Rica
Fog Probability
≥ 60.0%
Tue, Apr 7
23:0053%
Wed, Apr 8
24:0048%
01:0081%
02:0080%
03:0059%
04:0060%
05:0081%
06:0075%
07:0013%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:0034%
19:0028%
20:0077%
21:0067%
22:0059%
23:0046%
Thu, Apr 9
24:0059%
01:0046%
02:0046%
03:0046%
04:0048%
05:0057%
06:0049%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:0014%
23:0046%
Fri, Apr 10
24:0046%
01:0051%
02:0055%
03:0065%
04:0072%
05:0074%
06:0046%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0082%
20:0092%
21:0080%
22:0053%
23:0058%
Sat, Apr 11
24:0015%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:005.1%
15:007.3%
16:0016%
17:0053%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog Probability 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
America/Costa_Rica
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Wed, Apr 8 Sunrise 05:29 Sunset 17:46
19:00
0% 16°C 0.01mm 94% 0cm -19° 17°C 0.06mm 0.12kPa 336m 4m/s 2.1m/s
20:00
0% 16°C 0mm 97% 0cm -33° 17°C 0.13mm 0.06kPa 114m 4m/s 2m/s
21:00
0% 16°C 0mm 97% 0cm -47° 16°C 0.13mm 0.06kPa 746m 4.2m/s 2m/s
22:00
0% 15°C 0mm 96% 0cm -60° 15°C 0.13mm 0.06kPa 21183m 4.4m/s 2.4m/s
23:00
0% 14°C 0mm 95% 0cm -70° 15°C 0.13mm 0.08kPa 23495m 4.7m/s 2.5m/s
Thu, Apr 9 Sunrise 05:29 Sunset 17:46
24:00
0% 14°C 0mm 96% 0cm -72° 14°C 0.13mm 0.06kPa 24134m 4.8m/s 2.5m/s
01:00
0% 13°C 0mm 96% 0cm -63° 14°C 0mm 0.07kPa 24134m 4.8m/s 2.6m/s
02:00
0% 13°C 0mm 95% 0cm -51° 14°C 0mm 0.07kPa 24135m 5.3m/s 2.6m/s
03:00
0% 13°C 0mm 96% 0cm -37° 14°C 0mm 0.07kPa 24134m 5.2m/s 2.7m/s
04:00
0% 13°C 0mm 96% 0cm -22° 14°C 0mm 0.07kPa 9929m 5.5m/s 2.6m/s
05:00
0% 14°C 0mm 97% 0cm -7.9° 14°C 0mm 0.05kPa 7880m 5.7m/s 2.7m/s
06:00
0% 14°C 0mm 96% 0cm 6.9° 15°C 0mm 0.07kPa 5716m 6m/s 2.8m/s
07:00
0% 15°C 0mm 89% 0cm 21° 17°C 0mm 0.21kPa 8937m 5.1m/s 2.9m/s
08:00
0% 15°C 0mm 79% 0cm 36° 19°C 0mm 0.45kPa 24134m 5m/s 2.9m/s
09:00
0% 15°C 0mm 71% 0cm 51° 21°C 0.06mm 0.72kPa 24135m 4.8m/s 2.9m/s
10:00
0% 15°C 0mm 64% 0cm 66° 22°C 0.13mm 0.95kPa 24134m 4.9m/s 3.2m/s
11:00
0% 15°C 0mm 60% 0cm 80° 23°C 0.19mm 1.1kPa 24134m 4.9m/s 3.5m/s
12:00
0% 15°C 0mm 61% 0cm 84° 23°C 0.25mm 1.1kPa 24135m 4.8m/s 3.8m/s
13:00
2% 16°C 0mm 66% 0cm 70° 22°C 0.19mm 0.93kPa 22981m 5m/s 4m/s
14:00
5% 16°C 0mm 68% 0cm 55° 22°C 0.5mm 0.84kPa 21988m 4.4m/s 3.5m/s
15:00
7% 16°C 0.01mm 71% 0cm 40° 21°C 0.69mm 0.74kPa 24134m 4.3m/s 3.3m/s
16:00
5% 16°C 0mm 76% 0cm 25° 20°C 0.81mm 0.55kPa 24135m 4.2m/s 2.9m/s
17:00
3% 16°C 0mm 84% 0cm 11° 19°C 0.94mm 0.33kPa 21555m 4.2m/s 2.5m/s
18:00
1% 15°C 0mm 94% 0cm -4° 16°C 0.94mm 0.11kPa 8163m 4.9m/s 2.4m/s
19:00
1% 15°C 0mm 91% 0cm -19° 16°C 0mm 0.17kPa 22549m 5m/s 2.8m/s
20:00
0% 15°C 0mm 88% 0cm -33° 16°C 0mm 0.23kPa 24134m 5.2m/s 2.9m/s
21:00
0% 14°C 0mm 88% 0cm -47° 16°C 0mm 0.22kPa 24135m 5.6m/s 2.9m/s
22:00
0% 14°C 0mm 94% 0cm -60° 15°C 0mm 0.1kPa 24134m 5.6m/s 2.9m/s
23:00
0% 14°C 0mm 95% 0cm -70° 15°C 0mm 0.08kPa 24134m 6.1m/s 3m/s
Fri, Apr 10 Sunrise 05:28 Sunset 17:46
24:00
0% 14°C 0mm 96% 0cm -71° 15°C 0mm 0.07kPa 24135m 5.9m/s 2.9m/s
01:00
0% 14°C 0mm 96% 0cm -63° 14°C 0mm 0.06kPa 24134m 5.6m/s 2.7m/s
02:00
0% 14°C 0mm 97% 0cm -50° 14°C 0mm 0.05kPa 24134m 5.3m/s 2.7m/s
03:00
0% 14°C 0mm 97% 0cm -37° 14°C 0mm 0.05kPa 24135m 5.3m/s 2.6m/s
04:00
0% 14°C 0mm 98% 0cm -22° 15°C 0mm 0.04kPa 6304m 5m/s 2.7m/s
05:00
0% 14°C 0mm 98% 0cm -7.7° 15°C 0mm 0.03kPa 19927m 5.1m/s 2.8m/s
06:00
0% 15°C 0mm 95% 0cm 15°C 0mm 0.08kPa 24134m 5.2m/s 2.8m/s
07:00
1% 15°C 0mm 89% 0cm 22° 17°C 0mm 0.21kPa 24134m 4.9m/s 2.9m/s
08:00
1% 15°C 0mm 78% 0cm 36° 19°C 0mm 0.49kPa 24134m 5m/s 2.9m/s
09:00
2% 16°C 0mm 70% 0cm 51° 21°C 0.06mm 0.77kPa 24134m 4.6m/s 2.8m/s
10:00
3% 16°C 0mm 66% 0cm 66° 22°C 0.19mm 0.93kPa 24134m 4.4m/s 3m/s
11:00
4% 16°C 0mm 64% 0cm 81° 23°C 0.38mm 0.98kPa 24135m 4.1m/s 3.1m/s
12:00
5% 16°C 0mm 65% 0cm 84° 23°C 0.56mm 0.98kPa 24135m 3.7m/s 3.2m/s
13:00
12% 16°C 0mm 62% 0cm 70° 23°C 0.13mm 1.1kPa 24135m 3.8m/s 3.3m/s
14:00
19% 16°C 0mm 65% 0cm 55° 23°C 0.25mm 0.94kPa 7696m 3.7m/s 3.2m/s
15:00
26% 16°C 0mm 74% 0cm 40° 21°C 0.31mm 0.64kPa 3919m 3.6m/s 2.9m/s
16:00
22% 16°C 0mm 80% 0cm 25° 20°C 0.44mm 0.46kPa 1136m 3.6m/s 2.7m/s
17:00
17% 16°C 0mm 83% 0cm 11° 18°C 0.56mm 0.35kPa 24135m 3.6m/s 2.4m/s
18:00
13% 16°C 0mm 93% 0cm -4° 17°C 0.63mm 0.14kPa 4294m 4m/s 2.1m/s
19:00
9% 16°C 0mm 97% 0cm -19° 16°C 0.06mm 0.05kPa 3661m 4.5m/s 2.2m/s
20:00
4% 16°C 0mm 98% 0cm -33° 16°C 0.06mm 0.04kPa 609m 4.8m/s 2.4m/s
21:00
0% 15°C 0mm 98% 0cm -47° 16°C 0.13mm 0.04kPa 977m 5.1m/s 2.5m/s
22:00
0% 15°C 0mm 97% 0cm -60° 15°C 0.13mm 0.06kPa 3251m 5.3m/s 2.7m/s
23:00
0% 15°C 0mm 96% 0cm -70° 16°C 0.13mm 0.07kPa 602m 5.2m/s 2.7m/s
Sat, Apr 11 Sunrise 05:28 Sunset 17:46
24:00
0% 15°C 0mm 94% 0cm -71° 16°C 0.13mm 0.1kPa 3684m 5.1m/s 2.7m/s
01:00
0% 15°C 0mm 88% 0cm -62° 17°C 0.15mm 0.23kPa 3677m 5.3m/s 2.9m/s
02:00
0% 16°C 0mm 83% 0cm -50° 19°C 0.17mm 0.37kPa 3671m 5.5m/s 3.1m/s
03:00
0% 16°C 0mm 77% 0cm -36° 20°C 0.19mm 0.54kPa 3664m 5.6m/s 3.3m/s
04:00
0% 16°C 0.02mm 77% 0cm -22° 20°C 0.6mm 0.54kPa 2706m 5.3m/s 3.3m/s
05:00
0% 16°C 0.05mm 77% 0cm -7.6° 21°C 1mm 0.55kPa 1747m 4.9m/s 3.2m/s
06:00
0% 17°C 0.07mm 77% 0cm 7.1° 21°C 1.4mm 0.56kPa 788m 4.6m/s 3.1m/s
07:00
1% 17°C 0.07mm 78% 0cm 22° 21°C 1.4mm 0.54kPa 1860m 4.6m/s 3.1m/s
08:00
1% 16°C 0.06mm 78% 0cm 36° 20°C 1.3mm 0.52kPa 2932m 4.6m/s 3.1m/s
09:00
2% 16°C 0.06mm 78% 0cm 51° 20°C 1.3mm 0.51kPa 4003m 4.5m/s 3m/s
10:00
3% 16°C 0.06mm 84% 0cm 66° 19°C 1.5mm 0.36kPa 3061m 4.9m/s 2.9m/s
11:00
3% 16°C 0.06mm 89% 0cm 81° 18°C 1.7mm 0.22kPa 2119m 5.3m/s 2.8m/s
12:00
4% 16°C 0.06mm 94% 0cm 84° 17°C 1.9mm 0.11kPa 1178m 5.7m/s 2.7m/s
13:00
10% 15°C 0.04mm 94% 0cm 70° 16°C 1.3mm 0.12kPa 1050m 5.7m/s 2.7m/s
14:00
17% 15°C 0.02mm 93% 0cm 55° 16°C 0.67mm 0.12kPa 923m 5.7m/s 2.8m/s
15:00
23% 15°C 0mm 93% 0cm 40° 16°C 0.06mm 0.13kPa 795m 5.6m/s 2.8m/s
16:00
20% 15°C 0.003mm 94% 0cm 25° 16°C 0.1mm 0.11kPa 685m 5.7m/s 2.8m/s
17:00
16% 15°C 0.007mm 95% 0cm 11° 16°C 0.15mm 0.08kPa 574m 5.8m/s 2.7m/s
18:00
13% 16°C 0.01mm 97% 0cm -4° 16°C 0.19mm 0.06kPa 463m 5.9m/s 2.7m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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