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As of 12:16 EDT

Weather in Herndon, PA

59°Current weather

Herndon, Friday, 23 October, 12:16

Mostly clear. Feels like 57°. High 60°, low 43°.

Pressure30.36 inHg
Wind8.1 mph N
Humidity55%
Visibility6.2 mi
Dew point43°
Sat, 2461° / 36°0Clear
61 °Clear

Herndon, Saturday, 24 October

Clear. High 61°, low 36°.

Pressure30.56 inHg
Wind1.3 mph S
Humidity51%
Visibility6.2 mi
Dew point37°
Sun, 2559° / 36°0Clear
59 °Clear

Herndon, Sunday, 25 October

Clear. High 59°, low 36°.

Pressure30.59 inHg
Wind1.1 mph S
Humidity54%
Visibility6.2 mi
Dew point38°
Mon, 2666° / 38°0Partly cloudy
66 °Partly cloudy

Herndon, Monday, 26 October

Partly cloudy. High 66°, low 38°.

Pressure30.30 inHg
Wind1.1 mph W
Humidity61%
Visibility6.2 mi
Dew point46°
Tue, 2756° / 43°0Overcast
56 °Overcast

Herndon, Tuesday, 27 October

Overcast. High 56°, low 43°.

Pressure30.36 inHg
Wind7.4 mph N
Humidity60%
Visibility6.2 mi
Dew point40°
Wed, 2855° / 38°0Overcast
55 °Overcast

Herndon, Wednesday, 28 October

Overcast. High 55°, low 38°.

Pressure30.47 inHg
Wind7.1 mph S
Humidity62%
Visibility—
Dew point35°
Thu, 2964° / 48°0Overcast
64 °Overcast

Herndon, Thursday, 29 October

Overcast. High 64°, low 48°.

Pressure30.36 inHg
Wind8.9 mph S
Humidity75%
Visibility—
Dew point49°
Fri, 3069° / 48°0Partly cloudy
69 °Partly cloudy

Herndon, Friday, 30 October

Partly cloudy. High 69°, low 48°.

Pressure30.27 inHg
Wind5.3 mph SW
Humidity71%
Visibility—
Dew point50°
Sat, 3165° / 54°0Overcast
65 °Overcast

Herndon, Saturday, 31 October

Overcast. High 65°, low 54°.

Pressure30.30 inHg
Wind5 mph SE
Humidity78%
Visibility—
Dew point52°
Sun, 0160° / 55°1.14Rain
60 °Rain

Herndon, Sunday, 1 November

Rain. High 60°, low 55°.

Pressure30.21 inHg
Wind8.1 mph SE
Humidity95%
Visibility—
Dew point55°
Mon, 0266° / 57°0.08Light rain
66 °Light rain

Herndon, Monday, 2 November

Light rain. High 66°, low 57°.

Pressure30.06 inHg
Wind4.4 mph N
Humidity86%
Visibility—
Dew point57°
Tue, 0364° / 56°0Overcast
64 °Overcast

Herndon, Tuesday, 3 November

Overcast. High 64°, low 56°.

Pressure30.00 inHg
Wind4.5 mph NE
Humidity81%
Visibility—
Dew point54°
Wed, 0458° / 53°0.78Rain
58 °Rain

Herndon, Wednesday, 4 November

Rain. High 58°, low 53°.

Pressure29.97 inHg
Wind13.1 mph SE
Humidity87%
Visibility—
Dew point52°
Thu, 0559° / 54°0.2Rain
59 °Rain

Herndon, Thursday, 5 November

Rain. High 59°, low 54°.

Pressure30.03 inHg
Wind11.2 mph SE
Humidity91%
Visibility—
Dew point53°
Fri, 0658° / 54°0.07Light rain
58 °Light rain

Herndon, Friday, 6 November

Light rain. High 58°, low 54°.

Pressure29.88 inHg
Wind6.9 mph S
Humidity95%
Visibility—
Dew point55°
Sat, 0764° / 49°0Light rain
64 °Light rain

Herndon, Saturday, 7 November

Light rain. High 64°, low 49°.

Pressure29.77 inHg
Wind13.4 mph W
Humidity83%
Visibility—
Dew point50°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Herndon, PA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in Herndon, PA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.