Weather World

Iona, SD Weather Forecast

Feedback E-mail the Weather

Quick Weather Clicks

Current Conditions

Settings

Clear

72°F

Updated	6:16 am
Feels Like	66°F
Humidity	68%
Wind	SSW 13 mph
Barometer	29.7 in
Dew Point	61°F

Clear

22°C

Updated	6:16 am
Feels Like	19°C
Humidity	68%
Wind	SSW 21 km/h
Barometer	100.5 kPa
Dew Point	16°C

WX Settings

°F °C°F °C

Text IconsText Icons

Sun & Moon

Converter

Cloud Cover	82%
uv UV Index	6
Sunrise	7:14 AM
Sunset	7:56 PM
Moonrise	7:49 AM
Moonset	8:01 PM

Civil Twilight
6:41 AM to 7:10 AM
7:55 PM to 8:24 PM
Iona SD Weather - Waxing Crescent Moon

Waxing Crescent Moon

Iona Weather Forecast

TODAY	TONIGHT	SATURDAY	SATURDAY NIGHT	SUNDAY	SUNDAY NIGHT	MONDAY	MONDAY NIGHT	TUESDAY	TUESDAY NIGHT	WEDNESDAY	WEDNESDAY NIGHT

Windy	Windy	Mostly Sunny	Chance of T-Storm	Chance of T-Storm	Chance of T-Storm	Chance of Showers	Mostly Clear	Partly Sunny	Chance of Showers	Chance of Showers	Chance of Showers
Hi: 90°FHi: 32°C	Lo: 55°FLo: 13°C	Hi: 71°FHi: 22°C	Lo: 51°FLo: 11°C	Hi: 65°FHi: 18°C	Lo: 51°FLo: 11°C	Hi: 71°FHi: 22°C	Lo: 49°FLo: 9°C	Hi: 69°FHi: 21°C	Hi: 75°FHi: 24°C Lo: 50°FLo: 10°C	Hi: 75°FHi: 24°C Lo: 50°FLo: 10°C	Lo: 51°FLo: 11°C
			POP: 70%	POP: 70%	POP: 90%	POP: 20%			POP: 20%	POP: 20%	POP: 20%

POP = Probability of Precipitation.

Weather Outlook Updated: 521 AM CDT Fri Sep 11 2026 Iona, SD Weather - WeatherWorld.com

Trending Headlines

Iona Radar Loop

Use the map search tool if you want to place a location marker on the radar map...

Iona Weather Map

Comprehensive Weather Maps

Iona Quick Facts

National Two Day Weather Forecast

E-mail the Iona Weather Forecast

Voice your opinion or tell us about page issues...

Iona Forecast Discussion

Meteorlogic Glosserator
Instant definitions for any meteorological term.

Issued: 211 AM CDT Fri Sep 11 2026

Key Messages

Above normal high temperatures in the 80s today. A sharp cooldown is expected Saturday through early next week with highs in the 60s to low 70s. These temperatures are about 5 to 10 degrees below normal.
A Red Flag Warning is in effect for parts of south central South Dakota. A combination of dry fuels, wind gusts up to 40 miles per hour, and afternoon humidity around 20 percent will create critical fire weather conditions. Grassland Fire Danger will reach High for all counties west ...

Sponsored Links

Weather 101: Term of the Day

Ultraviolet Index

This index provides important information to help you plan your outdoor activities in ways that prevent overexposure to the sun's rays. It was designed by the National Weather Service (NWS) and the Environmental Protection Agency (EPA). Unlike some countries' indices, the United States UV Index is not based upon surface observations. Rather, it is computed using forecasted ozone levels, a computer model that relates ozone levels to UV incidence on the ground, forecasted cloud amounts, and the elevation of the forecast cities. The calculation starts with measurements of current total ozone amounts for the entire globe, obtained via two satellites operated by the National Oceanic and Atmospheric Administration (NOAA). These data are then used to produce a forecast of ozone levels for the next day at various points around the country. Minimal UV Index 0 - 2 for 60 min. + Apply SPF sunscreen. Low UV Index 3 - 4 for 45 min. Apply SPF sunscreen, wear a hat. Moderate UV Index 5 - 6 for 30 min. Apply SPF 15, wear a hat. High UV Index 7 - 9 for 15 - 24 min. Apply SPF 15 to 30, wear a hat and sunglasses. Limit midday exposure. Very High UV Index 10+ for 10 min. Apply SPF 30; wear a hat, sunglasses, and protective clothing; limit midday exposure.