Home › Weather › Overcast Weather
Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Toronto Post Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Overcast weather means a cloud layer covers 90–100% of the sky, blocking most direct sunlight. In the live forecast above, the overcast condition typically reduces daytime temperatures by 5–10°C compared to a clear sky, and often persists for hours or days when a slow-moving weather system is overhead.
What does overcast weather actually mean?
Meteorologically, overcast is defined as cloud cover of 8/8 oktas (the standard aviation and synoptic scale). Unlike “partly cloudy” or “mostly cloudy,” overcast leaves no visible blue sky. The overcast weather symbol on forecasts is a solid grey circle or bar. In Canadian English, the term is interchangeable with “full cloud cover,” though overcast vs cloudy is a matter of degree: cloudy can mean 6–7 oktas, while overcast is the maximum.
How does overcast affect daily conditions?
Overcast weather today often means lower UV index, reduced visibility (especially in winter with snow or fog), and a damp feel. The thick cloud layer traps heat near the ground at night, preventing frost in spring and autumn, but also blocks solar warming during the day. For those searching overcast weather meaning in urdu, it translates to “ابر آلود موسم” (abr-aalood mausam), describing the same sky condition. Common overcast weather synonyms include “grey sky,” “leaden sky,” or “dull conditions.”
Is overcast the same as fog?
No. Overcast is a high or mid-level cloud layer (stratus, altostratus, nimbostratus) that blocks the sky. Fog is ground-level cloud with visibility under 1 km. Overcast can occur with or without fog.
Does overcast mean it will rain?
Not always. Overcast from stratus clouds often brings drizzle or light rain, but altostratus overcast can be dry. Check the live forecast above for precipitation probability—overcast alone does not guarantee rain.
Can I use an overcast weather app to track this?
Yes. Most weather apps, including Environment Canada’s official app and The Weather Network, display cloud cover percentage or oktas. Look for the overcast weather symbol (solid grey circle) in the hourly or daily view.
Sources
For current conditions across the country, visit the Canada weather hub or check Toronto Weather for local overcast updates. If severe weather is expected, see the Weather Warning page.