Weather in Delaware County

So what happened to summer, right?

Since Delaware County is the warmest part of the state, it wasn't as busy as the rest of Pennsylvania, but 10 days without 90 degrees in August is something to behold.

Without the hot start to this month, the average temperature might be lower than normal. Currently, the average is only about one degree above normal, although temperatures are above 90 degrees on five of the six days to start the month.

This is similar to a year ago, when August 2023 was nothing to get excited about. And it is a reminder that normality is a moving target.

Meanwhile, meteorologists were predicting rainy weather Saturday through Monday, trying to predict when an approaching cold front would fight through the clouds and humidity and return the weather to bright sunny days like last week.

Current forecasts call for clearing skies on Tuesday and temperatures and humidity – or lack thereof – to be similar to September for several days, with cool nights even in urban areas.

Showers and thunderstorms could bring several inches of rain to the area on Sunday and Monday. A flood warning is in effect for Delaware County starting at 2 a.m. Sunday and lasting until 2 a.m. Monday.

There is also a flood warning in effect for the coast from 10 p.m. on Saturday until 2 a.m. on Monday.

Sunday morning could be very rainy, according to the National Weather Service in Mount Holly, NJ. “The latest forecasts indicate that the heaviest rainfall this round will be concentrated along the I-95 corridor and the fall line, where there may be slight topographic influences,” it says.
This first round will take place a few hours before and after sunrise and is expected to reach the north of the region by late morning.

“Forecasts are for widespread rainfall amounts of 1 to 3 inches, but local amounts of 4 inches or more are possible.”

Precipitation for the month at Philadelphia International Airport is already at 150% of normal after 16 full days. Saturday evening measured just over a tenth of an inch of rain for the day.

The weather service calculates the normal value as an average of the last three decades, in the current case from 1991 to 2020. As temperatures have risen in this 30-year block, especially in this century, the normal value has also risen.

Originally published: August 17, 2024 at 5:04 pm