Weather in North Sioux City, SD
North Sioux City, Sunday, 9 August, 19:29
Clear. Feels like 91°. High 87°, low 71°.
Monthly outlook for North Sioux City, SD: average high 89.8°, average low 67.5°. That is 4.2° above the climate normal for August. Precipitation is expected on 7 days (about 1.6 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 11 August (100.4°), the coolest 22 August (63.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 87.7° | 82.1° | +3.1° |
| 19 August – 28 August | 93.4° | 82.3° | +6.2° |
| 29 August – 7 September | at normal | 80.8° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Jefferson (6 mi).
0
North Sioux City, Monday, 10 August
Overcast. High 94°, low 73°.
0.04
North Sioux City, Tuesday, 11 August
Light rain. High 100°, low 71°.
0.14North Sioux City, Wednesday, 12 August
Rain. High 98°, low 67°.
0.19North Sioux City, Thursday, 13 August
Rain. High 81°, low 66°.
0.44North Sioux City, Friday, 14 August
Rain. High 78°, low 67°.
0.09North Sioux City, Saturday, 15 August
Light rain. High 78°, low 69°.
0.08North Sioux City, Sunday, 16 August
Light rain. High 82°, low 65°.
0.53North Sioux City, Monday, 17 August
Rain. High 86°, low 66°.
0
North Sioux City, Tuesday, 18 August
Partly cloudy. High 92°, low 68°.
0North Sioux City, Wednesday, 19 August
Overcast. High 86°, low 68°.
0North Sioux City, Thursday, 20 August
Clear. High 96°, low 69°.
0North Sioux City, Friday, 21 August
Partly cloudy. High 91°, low 64°.
0.03North Sioux City, Saturday, 22 August
Light rain. High 99°, low 63°.
0
North Sioux City, Sunday, 23 August
Mostly clear. High 99°, low 67°.
0.08North Sioux City, Monday, 24 August
Light rain. High 88°, low 66°.
0.09North Sioux City, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.11
North Sioux City, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.09North Sioux City, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14North Sioux City, Friday, 28 August
Climate normal for this date — 60-year average.
0.07North Sioux City, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09North Sioux City, Sunday, 30 August
Climate normal for this date — 60-year average.
0.1North Sioux City, Monday, 31 August
Climate normal for this date — 60-year average.
0.06North Sioux City, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09North Sioux City, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.13North Sioux City, Thursday, 3 September
Climate normal for this date — 60-year average.
0.11North Sioux City, Friday, 4 September
Climate normal for this date — 60-year average.
0.08North Sioux City, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05North Sioux City, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07North Sioux 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 North Sioux City, SD 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 North Sioux City, SD 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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