5:40 p.m. update: The high at Reagan National was 91 degrees. Five out five days in July 90+...

From 4:45 p.m.: If today’s high made 90 (still awaiting the official numbers, 89 at 4 p.m.), we’ll have reached that steamy benchmark five out of five days this month. Dry air was supposed to gradually trickle in today, but - in reality - humidity levels hardly budged from the sticky levels of recent days. Tomorrow, we have more heat and humidity as a warm front lifts north out of the central Virginia. That front may well trigger some thunderstorms.

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Through Tonight: An isolated evening sprinkle or brief shower can’t be ruled out (10-20 percent chance). Otherwise, it’s partly cloudy and muggy. Overnight lows vary from the low 70s downtown to the mid-60s in the cooler suburbs.

Tomorrow (Wednesday): Sky conditions vary from partly to mostly cloudy, with clouds most prevalent into the afternoon. As the front edges into the region, showers and thunderstorms are possible beginning in the late morning, but best chances (30-40%) are in the afternoon and in the southern suburbs (50% chance). Highs will be near today’s level - flirting with 90 degrees.

See Matt Rogers’ forecast through early next week. And if you haven’t already, join us on Facebook and follow us on Twitter

Pollen update: Walter Reed reports grass pollen is MODERATE and weed pollen LOW. The tree pollen report was absent.

International Space Station (ISS) pass tonight: This evening, the ISS will once again fly across the night sky. The pass will occur between 9:12 and 9:21 p.m., first appearing in the western sky. Unfortunately, since we’re contending with considerable cloudiness this evening, viewing prospects are iffy - but keep an eye out.