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As of 07:52 EDT

Weather in Herndon, PA

74°Current weather

Herndon, Sunday, 9 August, 07:52

Mostly clear. Feels like 76°. High 86°, low 72°.

Pressure30.00 inHg
Wind2.7 mph W
Humidity100%
Visibility6.2 mi
Dew point74°

Two-week outlook for Herndon, PA: week one averages a high of 82.3° and week two 86.6°, so week two runs 4.4° warmer than week one. Around 1.2 inches of precipitation are expected over the 14 days, across 2 wet days. The nearest weekend, August 9: 86°, dry.

Week one vs week two

WeekHighLowPrecipitationVs normal
1st (August 9 – August 15)82.3°62°1.0 in / 1 d—
2nd (August 16 – August 22)86.6°61.2°0.1 in / 1 d—

Weekend weather

Sun, August 9
Light rain
86°72°
0.04 in
Sat, August 15
Clear
77°52°
no precip.
Sun, August 16
Overcast
78°50°
no precip.
Sat, August 22
Clear
90°70°
no precip.
Mon, 1085° / 68°0.01Light rain
85 °Light rain

Herndon, Monday, 10 August

Light rain. High 85°, low 68°.

Pressure30.00 inHg
Wind5.5 mph SW
Humidity53%
Visibility6.2 mi
Dew point64°
Tue, 1186° / 66°0.93Heavy rain
86 °Heavy rain

Herndon, Tuesday, 11 August

Heavy rain. High 86°, low 66°.

Pressure29.91 inHg
Wind10.3 mph NW
Humidity57%
Visibility6.2 mi
Dew point65°
Wed, 1283° / 64°0.03Light rain
83 °Light rain

Herndon, Wednesday, 12 August

Light rain. High 83°, low 64°.

Pressure29.77 inHg
Wind9.9 mph W
Humidity69%
Visibility6.2 mi
Dew point66°
Thu, 1381° / 60°0.03Light rain
81 °Light rain

Herndon, Thursday, 13 August

Light rain. High 81°, low 60°.

Pressure29.80 inHg
Wind13 mph NW
Humidity33%
Visibility—
Dew point48°
Fri, 1478° / 53°0Mostly clear
78 °Mostly clear

Herndon, Friday, 14 August

Mostly clear. High 78°, low 53°.

Pressure30.03 inHg
Wind10.2 mph NW
Humidity35%
Visibility—
Dew point44°
Sat, 1577° / 52°0Clear
77 °Clear

Herndon, Saturday, 15 August

Clear. High 77°, low 52°.

Pressure30.15 inHg
Wind11.5 mph N
Humidity35%
Visibility—
Dew point44°
Sun, 1678° / 50°0Overcast
78 °Overcast

Herndon, Sunday, 16 August

Overcast. High 78°, low 50°.

Pressure30.15 inHg
Wind2.5 mph N
Humidity37%
Visibility—
Dew point47°
Mon, 1781° / 56°0Mostly clear
81 °Mostly clear

Herndon, Monday, 17 August

Mostly clear. High 81°, low 56°.

Pressure30.00 inHg
Wind5.6 mph S
Humidity43%
Visibility—
Dew point54°
Tue, 1884° / 60°0Mostly clear
84 °Mostly clear

Herndon, Tuesday, 18 August

Mostly clear. High 84°, low 60°.

Pressure30.00 inHg
Wind3.9 mph SE
Humidity43%
Visibility—
Dew point56°
Wed, 1987° / 62°0Clear
87 °Clear

Herndon, Wednesday, 19 August

Clear. High 87°, low 62°.

Pressure30.06 inHg
Wind10.3 mph S
Humidity41%
Visibility—
Dew point57°
Thu, 2091° / 63°0Partly cloudy
91 °Partly cloudy

Herndon, Thursday, 20 August

Partly cloudy. High 91°, low 63°.

Pressure30.00 inHg
Wind10.8 mph SE
Humidity40%
Visibility—
Dew point59°
Fri, 2195° / 67°0.15Light rain
95 °Light rain

Herndon, Friday, 21 August

Light rain. High 95°, low 67°.

Pressure29.85 inHg
Wind7.8 mph SW
Humidity58%
Visibility—
Dew point69°
Sat, 2290° / 70°0Clear
90 °Clear

Herndon, Saturday, 22 August

Clear. High 90°, low 70°.

Pressure29.94 inHg
Wind9.4 mph N
Humidity35%
Visibility—
Dew point56°

About this forecast

Can I plan a trip on a 2-week forecast?

Week one is solid for planning — accuracy is high. Week two shows the trend: go by the averages and the comparison with normal, and check the details closer to the date.

What does the "Vs normal" column mean?

It is the gap between the forecast and the climate normal for those same dates in Herndon, PA, computed over 60 years. A positive value means the week runs warmer than usual.

Why are weekends shown separately?

Saturday and Sunday plans are what people check most, so we give them their own cards with temperature and precipitation.