Honestly, if you're looking out the window in Philly tonight, you're probably seeing a whole lot of nothing but gray. It’s one of those weird, damp nights where the air just feels heavy. Right now, it's 30°F. Not freezing, but close enough that you’ll feel it in your bones if you’re out for more than five minutes.
The humidity is sitting at a staggering 96%. That basically means the air is holding as much water as it possibly can without just giving up and becoming a lake. Because of that, we've got some thick, soup-like fog rolling in.
The Reality of the Weather Tonight in Philadelphia
Most people think "cloudy" just means a boring sky. Tonight, it’s more about the ground level. We are dealing with visibility issues that could make the I-95 commute feel like a scene from a horror movie. The wind is barely moving—just a 3 mph breeze from the east—which means all that damp, cold air is just sitting right on top of us.
Is it going to rain? Kinda. There’s a 23% chance of some light precip right now, but the real story is what’s brewing for the morning.
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What’s Actually Happening with the Snow?
You’ve probably seen the alerts. There is a Winter Weather Advisory that kicks in at 6:00 AM on Sunday. If you’re planning to stay out late tonight, keep in mind that things transition fast. While it’s just cloudy and 30°F for the next few hours, the National Weather Service is tracking a system that’s going to dump 1 to 3 inches of snow starting early tomorrow.
Actually, the "wet" factor tonight is the biggest risk. Since the ground is cold and the humidity is maxed out, any "patchy freezing fog" can create black ice on the bridges. You won't see it. You'll just feel your tires lose it.
- Current Temp: 30°F
- Conditions: Cloudy/Foggy
- Wind: 3 mph (East)
- Humidity: 96%
- Precip Chance: 23% (Rain type)
Why This Forecast is Sneaky
People see "34°F high" for Sunday and think it’s too warm for snow. Wrong. The temperature is going to stay near steady, but the "low" for the full cycle is actually 19°F. We’re in that "sweet spot" where the atmosphere is just cold enough to turn everything white.
Tonight is the calm before that. It’s quiet.
If you have to be on the roads, use your low beams. High beams will just bounce off that 96% humidity fog and blind you. Seriously. Also, if you’re walking the dog, keep an eye on the sidewalks. That "mist" is actually freezing on untreated surfaces.
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Tomorrow’s Pivot
Once 6:00 AM hits, the vibe changes. We go from a 23% chance of rain tonight to a 46% chance of snow during the day. By Sunday night, that chance jumps to 40% for even more snow, and the temperature craters to 19°F.
Basically, tonight is your last chance to do anything outdoors without slipping.
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Actionable Next Steps:
- Check your wipers now. If they’re streaking in the fog tonight, they’ll be useless in the slush tomorrow.
- Salt your walk before bed. Since the humidity is so high, a thin layer of ice will likely form before the first snowflake even hits.
- Plan for a slow morning. The Winter Weather Advisory is in effect until 8:00 PM Sunday, so tonight is the time to gas up the car or grab the milk.
Stay warm, Philly. It's going to be a messy 24 hours.