Sioux City, Iowa Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Sioux City weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast11%—87°71°—
- SundayJul 5Overcast12%—90°69°+3°
- MondayJul 6Overcast——90°67°0°
- TuesdayJul 7Overcast——93°69°+3°
- WednesdayJul 8Light Showers50%—92°69°-1°
- ThursdayJul 9Drizzle50%0.04″86°65°-6°
- FridayJul 10Overcast——85°63°-1°
AQI 53 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 11.3 µg/m³, PM10 at 14.9 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 46 now. With UV 6.7 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 29 around 1 PM.
- Present
- AQI 46
- UV peak
- 6.7 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 29
PM × Wind × Precip
PM2.5 at 11.3 µg/m³, PM10 at 14.9 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.76
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:24 PM
- Moonset
- 10:29 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Sioux City at a glance
- Today vs. normal: 15°F above the seasonal normal for this latitude
- Last frost: May 1 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP codes: 51101, 51103, 51104, 51105, 51106, 51108, 51109, 51111
16-Day Forecast — Sioux City
- Sat87°71°11%
- Sun90°69°12%
- Mon90°67°1%
- Tue93°69°7%
- Wed92°69°50%
- Thu86°65°50%
- Fri85°63°9%
- Sat82°59°10%
- Sun85°62°7%
- Mon88°61°6%
- Tue89°62°4%
- Wed93°68°7%
- Thu95°68°13%
- Fri95°66°13%
- Sat82°61°10%
- Sun86°58°10%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Sioux City
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Sioux City
SPC includes Sioux City in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Sioux City
- 51106
- 51104
- 51105
- 51103
- 51101
- 51108
- 51109
- 51111