Question 1

Will there be fog tomorrow morning?

Accepted Answer

Fog formation depends on dew point depression (air temperature minus dew point), humidity, overnight wind speed, and terrain. When the gap between air temperature and dew point is 4°F or less, humidity is above 90%, wind is under 5 mph, and skies are clear overnight, fog formation is likely in valleys and low terrain. LightCast FogCast — exclusive to the iOS app — checks all these variables and gives you a fog probability score and estimated formation window for your location.

Question 2

How do I know if there will be fog in the morning?

Accepted Answer

Check the forecast for the 3–5am window at your target location. If air temperature and dew point are within 4°F, relative humidity is above 90%, wind is under 5 mph, and the overnight sky is clear, fog probability is high. Recent rain in the previous 24–48 hours raises baseline humidity and improves the setup. LightCast FogCast automates this check and gives you a single probability score.

Question 3

What time does fog burn off?

Accepted Answer

Radiation fog typically begins burning off 60 to 90 minutes after sunrise as solar heating warms the surface. The burn-off window — when fog is thinning and patchy but not yet gone — is usually the most photogenic phase. Dense valley fog can persist until mid-morning. FogCast shows estimated burn-off timing alongside formation probability.

Question 4

Is fog photography weather dependent?

Accepted Answer

Yes. Fog requires a specific combination of overnight conditions: high humidity, calm winds, clear skies for radiative cooling, and air temperature near the dew point. It's more predictable than most people assume once you know which variables to check — but those variables aren't surfaced by standard weather apps.

Will There Be Fog Tomorrow Morning?

Fog Is More Predictable Than You Think