CheckWeather US›Potomac
Potomac weather
Loading live data…The weather map: all three models at once
NWS, American, European side by side around Potomac 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 splitPotomac, MD is at its warmest in Jul (average highs near 89°F) and coldest in Jan (lows around 33°F), with roughly 46 in of precipitation across the year. Below, compare what NWS, American, European forecast for Potomac right now, and see exactly where they disagree.
Potomac climate by month
average daytime high and overnight low across a typical yearJan
47°
33°
Feb
51°
34°
Mar
56°
38°
Apr
69°
48°
May
74°
54°
Jun
84°
63°
Jul
89°
70°
Aug
85°
67°
Sep
78°
61°
Oct
69°
51°
Nov
57°
41°
Dec
48°
34°
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 Potomac today?
On this page we show what NWS, American, European each forecast for Potomac 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 Potomac today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Potomac 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 Potomac?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Potomac 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 Potomac?
Jul is typically the warmest month in Potomac, with average highs around 89°F.
How cold does Potomac get?
The coldest month in Potomac is Jan, when overnight lows average about 33°F.
How much rain does Potomac get?
Potomac sees roughly 46 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.