Ottumwa, Iowa Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Ottumwa weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle40%0.01″87°69°—
- SundayJul 5Overcast12%—87°68°0°
- MondayJul 6Overcast——83°68°-4°
- TuesdayJul 7Light Drizzle——85°66°+2°
- WednesdayJul 8T-storm w/ Hail31%—88°67°+3°
- ThursdayJul 9Thunderstorm46%0.48″80°69°-8°
- FridayJul 10Partly Cloudy17%—82°67°+2°
AQI 43 (Good), driven by Ozone. AQI up 15 in the last 6 hours — air quality is degrading. Ozone at AQI 46. Overcast through the UV peak window (cloud cover ~88%) — afternoon ozone should stay flat.
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. Overcast through the UV peak window (cloud cover ~88%) — afternoon ozone should stay flat.
- Present
- AQI 46
- UV peak
- 0.2 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 6
PM × Wind × Precip
PM2.5 at 6.5 µg/m³ (AQI 36) with a 0.80 fine-to-coarse ratio and 5 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.80
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
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
- 11:29 PM
- Moonset
- 11:22 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Ottumwa at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: April 22 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 52501
16-Day Forecast — Ottumwa
- Sat87°69°40%
- Sun87°68°12%
- Mon83°68°2%
- Tue85°66°0%
- Wed88°67°31%
- Thu80°69°46%
- Fri82°67°17%
- Sat77°66°6%
- Sun77°58°11%
- Mon83°60°6%
- Tue85°67°5%
- Wed86°70°19%
- Thu90°70°16%
- Fri90°73°16%
- Sat92°77°14%
- Sun87°66°26%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Ottumwa
SPC includes Ottumwa in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- 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 Ottumwa
- 52501