10-day forecast for Herndon, PA: 42° to 70°, with precipitation expected on 2 days. The table below breaks each day into morning, afternoon, evening and overnight.
70°
Best day: Thursday, October 29
67° · 1.11 in
Worst day: Friday, November 6
Tap any day below to see morning, afternoon, evening and overnight.
Fri, 3066° / 47°0
Morning52°feels 52°
Afternoon66°feels 64°
Evening51°feels 49°
Overnight50°feels 48°
66 °
Herndon, Friday, 30 October
Light rain. High 66°, low 47°.
Pressure30.15 inHg
Wind11.3 mph NW
Humidity53%
Visibility6.2 mi
Dew point45°
Sat, 3156° / 42°0
Morning42°feels 39°
Afternoon55°feels 53°
Evening49°feels 49°
Overnight44°feels 44°
56 °
Herndon, Saturday, 31 October
Overcast. High 56°, low 42°.
Pressure30.47 inHg
Wind5.1 mph N
Humidity57%
Visibility6.2 mi
Dew point37°
Sun, 0161° / 43°0
Morning43°feels 43°
Afternoon61°feels 59°
Evening51°feels 49°
Overnight45°feels 45°
61 °
Herndon, Sunday, 1 November
Overcast. High 61°, low 43°.
Pressure30.47 inHg
Wind4.3 mph S
Humidity57%
Visibility6.2 mi
Dew point41°
Mon, 0267° / 42°0
Morning47°feels 45°
Afternoon58°feels 56°
Evening63°feels 62°
Overnight51°feels 49°
67 °
Herndon, Monday, 2 November
Partly cloudy. High 67°, low 42°.
Pressure30.36 inHg
Wind7.9 mph S
Humidity64%
Visibility—
Dew point43°
Tue, 0365° / 48°0.01
Morning52°feels 50°
Afternoon59°feels 58°
Evening60°feels 59°
Overnight55°feels 54°
65 °
Herndon, Tuesday, 3 November
Light rain. High 65°, low 48°.
Pressure30.12 inHg
Wind10 mph S
Humidity64%
Visibility—
Dew point46°
Wed, 0460° / 55°0.03
Morning56°feels 56°
Afternoon57°feels 57°
Evening58°feels 58°
Overnight59°feels 59°
60 °
Herndon, Wednesday, 4 November
Light rain. High 60°, low 55°.
Pressure30.27 inHg
Wind8.1 mph SE
Humidity96%
Visibility—
Dew point56°
Thu, 0567° / 61°0.09
Morning62°feels 62°
Afternoon64°feels 64°
Evening64°feels 64°
Overnight62°feels 62°
67 °
Herndon, Thursday, 5 November
Light rain. High 67°, low 61°.
Pressure30.09 inHg
Wind18.7 mph SE
Humidity86%
Visibility—
Dew point59°
Fri, 0667° / 53°1.11
Morning64°feels 64°
Afternoon66°feels 66°
Evening63°feels 63°
Overnight55°feels 55°
67 °
Herndon, Friday, 6 November
Rain. High 67°, low 53°.
Pressure29.65 inHg
Wind20.7 mph SE
Humidity90%
Visibility—
Dew point62°
Sat, 0756° / 42°0.03
Morning55°feels 54°
Afternoon54°feels 53°
Evening48°feels 43°
Overnight45°feels 39°
56 °
Herndon, Saturday, 7 November
Light rain. High 56°, low 42°.
Pressure29.77 inHg
Wind13 mph N
Humidity81%
Visibility—
Dew point49°
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, PA 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.