Union Square, DC 14 Day Weather
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Union Square, DC Weather Forecast


Union Square, DC Weather Forecast Dated: 335 AM Thu Sep 03 2026 (Union Square Time)
Expect a very warm period with a mix of sun and clouds and mostly dry weather over the coming period. moderate humidity and no major pressure swings will dominate.
Thursday, September 3, 2026
Mid-Morning
77°F 25°C
Partly Cloudy
Mid-Afternoon
98°F 37°C
Sunny
Early-Evening
76°F 25°C
Overcast
Sizzling hot near 98°F 37°C with a heat index reaching 102°F 39°C, partly cloudy in the morning, sunny in the afternoon, and overcast this evening, with steady humidity and steady pressure.
Friday, September 4, 2026
Mid-Morning
78°F 25°C
Sunny
Mid-Afternoon
88°F 31°C
Overcast
Early-Evening
83°F 28°C
Sunny
Quite warm reaching 88°F 31°C, feeling like 92°F 34°C during peak afternoon, sunny in the morning, overcast in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds turning from the W to the N at 6 mph 10 km/h.
Saturday, September 5, 2026
Mid-Morning
73°F 23°C
Sunny
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
78°F 25°C
Sunny
Quite warm around 84°F 29°C, sunny throughout the day, with lower humidity and steady pressure. Winds switching from the N to the NE at 8 mph 13 km/h.
Sunday, September 6, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
84°F 29°C
Sunny
Early-Evening
76°F 24°C
Cloudy
Warm temperatures up to 84°F 29°C, sunny through the afternoon, turning partly cloudy this evening, with lower humidity and steady pressure.
Monday, September 7, 2026
Mid-Morning
68°F 20°C
Sunny
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
77°F 25°C
Overcast
Very warm with a high of 82°F 28°C, sunny in the morning, becoming overcast through the afternoon and evening, with steady humidity and barometric pressure falling.
Tuesday, September 8, 2026
Mid-Morning
75°F 24°C
Overcast
Mid-Afternoon
88°F 31°C
Overcast
Early-Evening
84°F 29°C
Overcast
Very warm near 88°F 31°C, though humidity makes it feel like 91°F 33°C, overcast throughout the day, with lower humidity and steady pressure.
Wednesday, September 9, 2026
Mid-Morning
82°F 28°C
Sunny
Mid-Afternoon
97°F 36°C
Sunny
Early-Evening
93°F 34°C
Overcast
Sizzling hot near 97°F 36°C with a heat index reaching 101°F 38°C, partly cloudy in the morning, sunny in the afternoon, and cloudy this evening, with lower humidity and barometric pressure falling. Winds moving from the WSW to the SW at 7 mph 10 km/h.
Thursday, September 10, 2026
Mid-Morning
83°F 28°C
Sunny
Mid-Afternoon
93°F 34°C
Sunny
Early-Evening
85°F 30°C
Sunny
Sizzling hot with 93°F 34°C, cloudy in the morning, becoming sunny through the afternoon and evening, with lower humidity and steady pressure. Winds swinging from the WNW to the NNW at 12 mph 18 km/h. Gusts up to 21 mph 34 km/h.
Friday, September 11, 2026
Mid-Morning
64°F 18°C
Sunny
Mid-Afternoon
77°F 25°C
Overcast
Early-Evening
73°F 23°C
Sunny
Mild temperatures up to 77°F 25°C, sunny in the morning, becoming partly cloudy through the afternoon and evening, with lower humidity and steady pressure. Winds shifting from the N to the NE at 6 mph 9 km/h.
Saturday, September 12, 2026
Mid-Morning
67°F 19°C
Overcast
Mid-Afternoon
81°F 27°C
Sunny
Early-Evening
75°F 24°C
Sunny
Very warm with a high of 81°F 27°C, overcast in the morning, cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure.
Sunday, September 13, 2026
Mid-Morning
70°F 21°C
Overcast
Mid-Afternoon
85°F 29°C
Partly Cloudy
Early-Evening
78°F 26°C
Sunny
Warm and summery near 85°F 29°C, partly cloudy in the morning, cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds turning from the S to the SE at 8 mph 13 km/h.
Monday, September 14, 2026
Mid-Morning
74°F 24°C
Overcast
Mid-Afternoon
92°F 34°C
Overcast
Early-Evening
87°F 31°C
Sunny
Very hot with a high of 92°F 34°C, feeling closer to 97°F 36°C in the humidity, cloudy in the morning, overcast in the afternoon, and partly cloudy this evening, with steady humidity and barometric pressure falling.
Tuesday, September 15, 2026
Mid-Morning
82°F 28°C
Sunny
Mid-Afternoon
95°F 35°C
Sunny
Early-Evening
86°F 30°C
Sunny
Sizzling hot near 95°F 35°C with a heat index reaching 98°F 37°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with lower humidity and steady pressure. Winds switching from the WNW to the N at 7 mph 11 km/h.
Wednesday, September 16, 2026
Mid-Morning
70°F 21°C
Sunny
Mid-Afternoon
82°F 28°C
Overcast
Early-Evening
73°F 23°C
Sunny
Warm temperatures up to 82°F 28°C, sunny in the morning, becoming partly cloudy through the afternoon and evening, with steady humidity and steady pressure. Winds moving from the NW to the SW at 12 mph 20 km/h. Gusts up to 20 mph 32 km/h.
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