FogCast · Ruby Beach, WA
Fog Forecast for Ruby Beach
Know before you drive: FogCast checks the conditions that produce photogenic fog
Reading current conditions…
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Fog photography at Ruby Beach
Ruby Beach on the Washington coast in Olympic National Park is one of the most photographed beaches in the Pacific Northwest — a wide cobble and driftwood beach studded with dramatic sea stacks and offshore seastacks that disappear into the Pacific fog with haunting regularity. The Hoh River reaches the ocean just north of Ruby Beach, and the combination of river mouth, sea stacks, massive bleached driftwood logs, and coastal fog creates a landscape of unusual visual richness.
The sea stacks and offshore rocks are the primary subjects — Destruction Island lighthouse is occasionally visible far offshore in partial fog when the marine layer is thin. The massive driftwood piles above the high tide line provide strong geometric foreground elements against foggy sea stacks. Abbey Island, directly offshore, is the largest and most photogenic sea stack, disappearing and reappearing through fog with dramatic effect. May through August is the reliable marine fog season; fall and winter bring storm light that is also exceptional though fog is less predictable then.
Ruby Beach fog is Pacific maritime marine layer moving onshore from the west and northwest. The beach's full western exposure means there are no barriers between the photographers and the open Pacific fog bank. When the marine layer is 150–300 meters deep and onshore winds are 10–20 km/h, fog is dense on the beach from pre-dawn through mid-morning. Early morning low tide combined with fog is the ideal condition — the tidal pools and kelp reflect fog-diffused sky light beautifully.
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Why fog is hard to predict
Humidity alone isn't enough. Wind alone isn't enough. Cloud cover alone isn't enough. Photogenic valley fog requires several conditions to line up at once, and most weather apps don't read them together.
Dew Point Depression
When air temperature and dew point converge below 2°C, the air is near saturation. This is the single strongest fog predictor and the first thing FogCast checks.
Wind Speed
Fog needs calm air. Below 5 km/h is ideal. Above 15 km/h, fog disperses before it can pool in the valley. A standard weather app won't flag this combination.
Overnight Sky Clarity
Clear overnight skies let the ground cool rapidly, pushing surface temperatures toward the dew point. Counterintuitively, clouds overnight suppress radiation fog.
Temperature Trend
FogCast reads the overnight temperature arc. If temps are converging toward the dew point hour by hour, fog probability increases significantly by pre-dawn.
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What the app shows you
Set a threshold and get a notifications when fog will form. Never check manually again.
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Frequently asked
Can I check FogCast on the website?
This page shows a preview of current conditions, including humidity, wind, temperature, and dew point. The full FogCast score, 7-day outlook, push notifications, and best shooting windows are available exclusively in the LightCast app for iOS.
Is FogCast free?
The current conditions preview on this page is free, no account needed. The full FogCast tool is in the LightCast Suite iOS app, which includes a 7-day free trial. After the trial it's $2.99/month, cancel anytime in the App Store.
Why use FogCast instead of checking humidity?
Humidity alone doesn't tell you whether photogenic fog is likely. High humidity with strong wind produces no fog at all. FogCast combines dew point depression, wind speed, overnight sky clarity, temperature trend, and visibility into a single score built specifically for fog photography planning.
What is FogCast's scoring scale?
FogCast scores fog conditions from 0 to 100. A score of 75 or above indicates dense fog is expected. 55 to 74 means fog is likely and worth chasing. 35 to 54 suggests patchy mist is possible. Below 35, conditions are unlikely to produce photogenic fog. The full score is available in the LightCast app.