Weather in Iona, SD
Iona, Saturday, 8 August, 21:20
Clear. Feels like 82°. High 92°, low 57°.
Monthly outlook for Iona, SD: average high 87.2°, average low 62.7°. That is 1.2° above the climate normal for August. Precipitation is expected on 6 days (about 2.3 inches), against a normal of 4 days and 1.2 inches. The warmest day looks like 10 August (103.4°), the coolest 8 August (57.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 89° | 85° | +2.2° |
| 18 August – 27 August | 84.1° | 85° | -0.5° |
| 28 August – 6 September | at normal | 83.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Hamill (14 mi).
0
Iona, Sunday, 9 August
Mostly clear. High 95°, low 66°.
0.01
Iona, Monday, 10 August
Light rain. High 103°, low 66°.
0.02Iona, Tuesday, 11 August
Light rain. High 96°, low 66°.
0.29Iona, Wednesday, 12 August
Rain. High 92°, low 67°.
0.65Iona, Thursday, 13 August
Rain. High 73°, low 62°.
0
Iona, Friday, 14 August
Overcast. High 80°, low 59°.
0.01Iona, Saturday, 15 August
Light rain. High 81°, low 65°.
0.02Iona, Sunday, 16 August
Light rain. High 83°, low 65°.
0.06Iona, Monday, 17 August
Light rain. High 96°, low 67°.
0.02Iona, Tuesday, 18 August
Light rain. High 98°, low 67°.
0.1Iona, Wednesday, 19 August
Light rain. High 82°, low 60°.
0.44Iona, Thursday, 20 August
Rain. High 68°, low 58°.
0.7Iona, Friday, 21 August
Heavy rain. High 84°, low 57°.
0
Iona, Saturday, 22 August
Clear. High 88°, low 62°.
0.01Iona, Sunday, 23 August
Light rain. High 86°, low 61°.
0.05
Iona, Monday, 24 August
Climate normal for this date — 60-year average.
0.05Iona, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.05Iona, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.03Iona, Thursday, 27 August
Climate normal for this date — 60-year average.
0.05Iona, Friday, 28 August
Climate normal for this date — 60-year average.
0.04Iona, Saturday, 29 August
Climate normal for this date — 60-year average.
0.07Iona, Sunday, 30 August
Climate normal for this date — 60-year average.
0.04Iona, Monday, 31 August
Climate normal for this date — 60-year average.
0.08Iona, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.08Iona, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.04Iona, Thursday, 3 September
Climate normal for this date — 60-year average.
0.06Iona, Friday, 4 September
Climate normal for this date — 60-year average.
0.06Iona, Saturday, 5 September
Climate normal for this date — 60-year average.
0.04Iona, Sunday, 6 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 Iona, 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 Iona, 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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