CheckWeather US›Herndon
Herndon weather
Loading live data…The weather map: all three models at once
NWS, American, European side by side around Herndon and nearby towns.Live rain radar →Loading the three model maps…
Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitHerndon, VA is at its warmest in Jul (average highs near 90°F) and coldest in Jan (lows around 31°F), with roughly 42 in of precipitation across the year. Below, compare what NWS, American, European forecast for Herndon right now, and see exactly where they disagree.
Herndon climate by month
average daytime high and overnight low across a typical yearJan
47°
31°
Feb
52°
32°
Mar
57°
36°
Apr
70°
47°
May
75°
54°
Jun
85°
62°
Jul
90°
69°
Aug
87°
67°
Sep
79°
61°
Oct
70°
49°
Nov
57°
40°
Dec
48°
33°
Which forecast is most accurate in the US?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 40 cities. Lower error means a higher score. The apps you know (AccuWeather, Apple Weather, The Weather Channel) are built on these models.
Common questions
What's the weather in Herndon today?
On this page we show what NWS, American, European each forecast for Herndon today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Herndon today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Herndon and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Herndon?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Herndon forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Herndon?
Jul is typically the warmest month in Herndon, with average highs around 90°F.
How cold does Herndon get?
The coldest month in Herndon is Jan, when overnight lows average about 31°F.
How much rain does Herndon get?
Herndon sees roughly 42 in of precipitation a year, with Dec usually the wettest month.
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.