St. Joseph, Iowa Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
St. Joseph weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Foggy10%—86°64°—
- MondayJul 6Overcast——88°67°+2°
- TuesdayJul 7Overcast——86°66°-2°
- WednesdayJul 8Thunderstorm39%—82°66°-4°
- ThursdayJul 9Overcast37%—76°61°-6°
- FridayJul 10Light Drizzle——82°61°+6°
- SaturdayJul 11Light Drizzle——76°64°-6°
AQI 37 (Good), driven by PM2.5. AQI down 7 over the last 6 hours (gradual decline). PM2.5 at 5.6 µg/m³ (AQI 31) with a 0.82 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 5.6 µg/m³ (AQI 31) with a 0.82 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.82
- 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
- 11:38 PM
- Moonset
- 11:29 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
St. Joseph at a glance
- Today vs. normal: 69°F — typical for the season
- Last frost: May 3 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
15-Day Forecast — St. Joseph
- Sun86°65°10%
- Mon88°67°3%
- Tue86°66°7%
- Wed82°66°39%
- Thu76°61°37%
- Fri82°61°6%
- Sat76°64°8%
- Sun77°59°6%
- Mon85°63°8%
- Tue88°69°6%
- Wed81°66°10%
- Thu90°70°16%
- Fri92°73°25%
- Sat91°66°29%
- Sun80°61°17%
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 — St. Joseph
SPC includes St. Joseph 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 St. Joseph
- 50519