NWS, American, European side by side around Sioux City and nearby towns.Live rain radar →
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Next 14 hours
consensus of the three models
7-day forecast
where the models agree, and where they split
Sioux City, IA is at its warmest in Jul (average highs near 84°F) and coldest in Jan (lows around 12°F), with roughly 31 in of precipitation across the year. Below, compare what NWS, American, European forecast for Sioux City right now, and see exactly where they disagree.
Sioux City climate by month
average daytime high and overnight low across a typical year
Jan
25°
12°
Feb
42°
21°
Mar
47°
27°
Apr
61°
41°
May
75°
53°
Jun
83°
63°
Jul
84°
65°
Aug
84°
66°
Sep
81°
61°
Oct
66°
47°
Nov
50°
33°
Dec
38°
24°
Common questions
What's the weather in Sioux City today?
On this page we show what NWS, American, European each forecast for Sioux City 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 Sioux City today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Sioux City 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 Sioux City?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Sioux City 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 Sioux City?
Jul is typically the warmest month in Sioux City, with average highs around 84°F.
How cold does Sioux City get?
The coldest month in Sioux City is Jan, when overnight lows average about 12°F.
How much rain does Sioux City get?
Sioux City sees roughly 31 in of precipitation a year, with Jun 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.