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As of 07:10 EDT

Weather in Herndon, PA

36°Current weather

Herndon, Thursday, 22 October, 07:10

Clear. Feels like 31°. High 66°, low 36°.

Pressure30.12 inHg
Wind5.8 mph N
Humidity95%
Visibility6.2 mi
Dew point35°
Fri, 2360° / 44°0Clear
60 °Clear

Herndon, Friday, 23 October

Clear. High 60°, low 44°.

Pressure30.39 inHg
Wind5.3 mph NE
Humidity60%
Visibility6.2 mi
Dew point40°
Sat, 2458° / 38°0Clear
58 °Clear

Herndon, Saturday, 24 October

Clear. High 58°, low 38°.

Pressure30.53 inHg
Wind0.8 mph SE
Humidity55%
Visibility6.2 mi
Dew point38°
Sun, 2558° / 37°0Clear
58 °Clear

Herndon, Sunday, 25 October

Clear. High 58°, low 37°.

Pressure30.56 inHg
Wind1.9 mph S
Humidity54%
Visibility6.2 mi
Dew point38°
Mon, 2666° / 38°0Clear
66 °Clear

Herndon, Monday, 26 October

Clear. High 66°, low 38°.

Pressure30.39 inHg
Wind5.7 mph N
Humidity70%
Visibility—
Dew point42°
Tue, 2757° / 45°0Clear
57 °Clear

Herndon, Tuesday, 27 October

Clear. High 57°, low 45°.

Pressure30.42 inHg
Wind8 mph N
Humidity66%
Visibility—
Dew point41°
Wed, 2861° / 44°0Overcast
61 °Overcast

Herndon, Wednesday, 28 October

Overcast. High 61°, low 44°.

Pressure30.30 inHg
Wind8.4 mph S
Humidity48%
Visibility—
Dew point34°
Thu, 2966° / 52°0.01Light rain
66 °Light rain

Herndon, Thursday, 29 October

Light rain. High 66°, low 52°.

Pressure30.15 inHg
Wind4.6 mph W
Humidity77%
Visibility—
Dew point51°
Fri, 3065° / 52°0Overcast
65 °Overcast

Herndon, Friday, 30 October

Overcast. High 65°, low 52°.

Pressure30.18 inHg
Wind4.5 mph NE
Humidity72%
Visibility—
Dew point48°
Sat, 3167° / 50°0Overcast
67 °Overcast

Herndon, Saturday, 31 October

Overcast. High 67°, low 50°.

Pressure30.15 inHg
Wind12.7 mph S
Humidity68%
Visibility—
Dew point49°
Sun, 0165° / 55°0.06Light rain
65 °Light rain

Herndon, Sunday, 1 November

Light rain. High 65°, low 55°.

Pressure29.94 inHg
Wind11.1 mph SW
Humidity92%
Visibility—
Dew point55°
Mon, 0256° / 48°0Overcast
56 °Overcast

Herndon, Monday, 2 November

Overcast. High 56°, low 48°.

Pressure30.03 inHg
Wind7.7 mph N
Humidity71%
Visibility—
Dew point46°
Tue, 0356° / 38°0Overcast
56 °Overcast

Herndon, Tuesday, 3 November

Overcast. High 56°, low 38°.

Pressure30.36 inHg
Wind5.1 mph N
Humidity56%
Visibility—
Dew point32°
Wed, 0452° / 35°0Overcast
52 °Overcast

Herndon, Wednesday, 4 November

Overcast. High 52°, low 35°.

Pressure30.45 inHg
Wind8.8 mph N
Humidity56%
Visibility—
Dew point31°
Thu, 0550° / 29°0Overcast
50 °Overcast

Herndon, Thursday, 5 November

Overcast. High 50°, low 29°.

Pressure30.65 inHg
Wind8 mph E
Humidity44%
Visibility—
Dew point20°
Fri, 0654° / 37°0.05Light rain
54 °Light rain

Herndon, Friday, 6 November

Light rain. High 54°, low 37°.

Pressure30.47 inHg
Wind8.3 mph SE
Humidity69%
Visibility—
Dew point37°

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.