Heron Lake, Minnesota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Heron Lake weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Foggy12%—85°69°—
- SundayJul 5Partly Cloudy16%—85°65°0°
- MondayJul 6Partly Cloudy——86°65°+1°
- TuesdayJul 7Overcast15%—88°67°+2°
- WednesdayJul 8Thunderstorm46%0.02″83°67°-5°
- ThursdayJul 9Overcast46%—80°63°-3°
- FridayJul 10Thunderstorm——86°63°+6°
AQI 33 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 39 now. With UV 5.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 20 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 39 now. With UV 5.4 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 20 around 1 PM.
- Present
- AQI 39
- UV peak
- 5.4 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 20
PM × Wind × Precip
PM2.5 at 5.7 µg/m³ (AQI 32) with a 0.79 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.79
- Wind
- calm
- 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
- 11:22 PM
- Moonset
- 10:23 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Heron Lake at a glance
- Today vs. normal: 12°F above the seasonal normal for this latitude
- Last frost: May 9 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 56137
16-Day Forecast — Heron Lake
- Sat85°69°12%
- Sun85°65°16%
- Mon86°65°3%
- Tue88°67°15%
- Wed83°67°46%
- Thu80°63°46%
- Fri86°63°9%
- Sat81°61°13%
- Sun74°55°12%
- Mon81°55°7%
- Tue86°63°5%
- Wed79°64°14%
- Thu87°61°14%
- Fri90°67°16%
- Sat90°67°16%
- Sun93°70°16%
Forecast data from Open-Meteo (CC BY 4.0).
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 — Heron Lake
SPC includes Heron Lake in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3TSTMGeneral Thunderstorms
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 Heron Lake
- 56137