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Becoming Milder, Humidity Creeping Up As Well

Monday climate report
Monday climate report
Scott Derek

Monday was a perfect late August day; plenty of sunshine, some clouds in the afternoon too as highs reached 86 at Philadelphia International Airport(after a cool overnight low of 63). High pressure provided dry air from the north, but then the wind shifted from out of the southeast in the afternoon. Overnight whatever clouds are pushing through now shall provide a mostly clear sky before sunrise; lows will range from the upper 50s in the suburbs to the lower 60s in Center City.

High pressure is just to our south, but mid-level moisture is becoming more abundant(meaning more humidity)

Tuesday will feature sunshine and afternoon fair weather clouds once we reach the convective temperature(the estimated temperature that the surface must warm to for clouds to develop); highs will be in the middle 80s with a southerly wind around 10mph, but along the shore there will be a sea breeze so temperatures will be in the lower 80s as water temperatures are in the middle 70s.

By Wednesday we not only will have a southerly flow, but the humidity rises as well ahead of a cold front; we have a great shot at reaching 90 degrees before clouds roll in ahead of a cold front. There's also a chance for showers and thunderstorms in the late afternoon, but they will be isolated in nature and I don't expect any severe storms either(just the typical air mass thunderstorm with some instability due to the frontal passage nearby). After overnight lows in the lower 70s we'll be in the middle 80s on Thursday with clouds giving way to sunshine in the afternoon as the cold front pushes southward.

Friday will feature a dry northerly wind so highs will be in the lower 80s, but it's short lived as that front pushes back north as a warm front for the weekend; I know it's Labor Day weekend, but it will be unsettled with scattered showers and thunderstorms throughout the weekend(NO WASHOUTS!). Highs will be close to 90 degrees and it will be hazy, hot, and humid as well so it will feel more like the Fourth of July rather than the end of the summer.

There's still plenty of time to "fine tune" that forecast so stay tuned on here and remember that you can always check out the 7-day forecast(as well as obtain radar and satellite maps) any time at

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