Weather in Sioux City, IA
Sioux City, Sunday, 9 August, 00:36
Mostly clear. Feels like 70°. High 94°, low 70°.
Monthly outlook for Sioux City, IA: average high 88.4°, average low 62.2°. That is 3.5° above the climate normal for August. Precipitation is expected on 5 days (about 0.9 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 10 August (104.1°), the coolest 21 August (51.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 89.7° | 82° | +4.3° |
| 19 August – 28 August | 86.1° | 82.2° | +2.2° |
| 29 August – 7 September | at normal | 80.7° | — |
August records over 66 years
0
Sioux City, Monday, 10 August
Overcast. High 104°, low 71°.
0
Sioux City, Tuesday, 11 August
Partly cloudy. High 103°, low 68°.
0.31
Sioux City, Wednesday, 12 August
Rain. High 95°, low 67°.
0.24Sioux City, Thursday, 13 August
Light rain. High 73°, low 61°.
0Sioux City, Friday, 14 August
Overcast. High 82°, low 57°.
0Sioux City, Saturday, 15 August
Light rain. High 71°, low 63°.
0Sioux City, Sunday, 16 August
Overcast. High 85°, low 59°.
0
Sioux City, Monday, 17 August
Clear. High 91°, low 64°.
0.04Sioux City, Tuesday, 18 August
Light rain. High 100°, low 66°.
0.09Sioux City, Wednesday, 19 August
Light rain. High 87°, low 60°.
0.04Sioux City, Thursday, 20 August
Light rain. High 63°, low 55°.
0Sioux City, Friday, 21 August
Overcast. High 82°, low 52°.
0.11Sioux City, Saturday, 22 August
Light rain. High 95°, low 59°.
0.03Sioux City, Sunday, 23 August
Light rain. High 93°, low 62°.
0.01Sioux City, Monday, 24 August
Light rain. High 97°, low 61°.
0.09Sioux City, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.11
Sioux City, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.09Sioux City, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14Sioux City, Friday, 28 August
Climate normal for this date — 60-year average.
0.07
Sioux City, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Sioux City, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09Sioux City, Monday, 31 August
Climate normal for this date — 60-year average.
0.08Sioux City, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.08Sioux City, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.13Sioux City, Thursday, 3 September
Climate normal for this date — 60-year average.
0.11Sioux City, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Sioux City, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Sioux City, Sunday, 6 September
Climate normal for this date — 60-year average.
0.08Sioux City, Monday, 7 September
Climate normal for this date — 60-year average.
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 Sioux City, IA 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 Sioux City, IA 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.
Sun and moon today
Weather history
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