10-day forecast for Herndon, GA: 73° to 98°, with precipitation expected on 5 days. The table below breaks each day into morning, afternoon, evening and overnight.
97°
Best day: Tuesday, August 11
96° · 0.88 in
Worst day: Tuesday, August 18
Tap any day below to see morning, afternoon, evening and overnight.
Mon, 1097° / 76°0.12
Morning78°feels 79°
Afternoon93°feels 99°
Evening80°feels 80°
Overnight78°feels 80°
97 °
Herndon, Monday, 10 August
Rain. High 97°, low 76°.
Pressure30.12 inHg
Wind9.3 mph W
Humidity53%
Visibility6.2 mi
Dew point71°
Tue, 1197° / 76°0.01
Morning78°feels 79°
Afternoon97°feels 102°
Evening85°feels 90°
Overnight78°feels 79°
97 °
Herndon, Tuesday, 11 August
Light rain. High 97°, low 76°.
Pressure30.06 inHg
Wind10.2 mph W
Humidity44%
Visibility6.2 mi
Dew point69°
Wed, 1297° / 79°0.02
Morning80°feels 80°
Afternoon97°feels 103°
Evening88°feels 93°
Overnight81°feels 83°
97 °
Herndon, Wednesday, 12 August
Light rain. High 97°, low 79°.
Pressure29.97 inHg
Wind12 mph W
Humidity44%
Visibility6.2 mi
Dew point70°
Thu, 1398° / 75°0.03
Morning83°feels 85°
Afternoon97°feels 102°
Evening88°feels 92°
Overnight79°feels 79°
98 °
Herndon, Thursday, 13 August
Light rain. High 98°, low 75°.
Pressure29.94 inHg
Wind15.5 mph SW
Humidity38%
Visibility—
Dew point65°
Fri, 1498° / 75°0.24
Morning83°feels 85°
Afternoon94°feels 98°
Evening77°feels 79°
Overnight78°feels 79°
98 °
Herndon, Friday, 14 August
Rain. High 98°, low 75°.
Pressure30.03 inHg
Wind11.4 mph W
Humidity39%
Visibility—
Dew point65°
Sat, 1594° / 74°0.7
Morning82°feels 85°
Afternoon91°feels 99°
Evening75°feels 77°
Overnight74°feels 76°
94 °
Herndon, Saturday, 15 August
Heavy rain. High 94°, low 74°.
Pressure30.12 inHg
Wind11.2 mph E
Humidity49%
Visibility—
Dew point70°
Sun, 1690° / 73°0
Morning78°feels 80°
Afternoon88°feels 92°
Evening83°feels 85°
Overnight77°feels 78°
90 °
Herndon, Sunday, 16 August
Overcast. High 90°, low 73°.
Pressure30.15 inHg
Wind8.6 mph SE
Humidity53%
Visibility—
Dew point67°
Mon, 1792° / 74°0.68
Morning80°feels 84°
Afternoon89°feels 97°
Evening78°feels 79°
Overnight75°feels 77°
92 °
Herndon, Monday, 17 August
Rain. High 92°, low 74°.
Pressure30.06 inHg
Wind11.2 mph SE
Humidity56%
Visibility—
Dew point71°
Tue, 1896° / 74°0.88
Morning81°feels 85°
Afternoon91°feels 100°
Evening75°feels 77°
Overnight74°feels 76°
96 °
Herndon, Tuesday, 18 August
Heavy rain. High 96°, low 74°.
Pressure29.94 inHg
Wind15.7 mph E
Humidity51%
Visibility—
Dew point71°
About this forecast
How reliable is a 10-day forecast?
The first 3–5 days are the most reliable, typically within 2–4°. From day six to ten the models show the trend: the direction of change is right more often than the exact numbers.
What does the time-of-day table show?
Temperature in Herndon, GA around 8am, 2pm, 8pm and 2am each day — handy for planning a walk, a drive or work outdoors.
How is the best day chosen?
We weigh the daytime high against precipitation: a warm, dry day scores highest.