Waltham, Minnesota Weather
Cicadas claim the afternoon. Day 14 of summer. Read this microseason across nine climate regions →
Waltham weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Rain21%0.13″82°65°—
- SundayJul 5Overcast22%—81°65°-1°
- MondayJul 6Light Drizzle——81°65°0°
- TuesdayJul 7Overcast——83°63°+2°
- WednesdayJul 8T-storm w/ Hail53%0.02″79°66°-4°
- ThursdayJul 9Overcast53%—78°57°-1°
- FridayJul 10Light Drizzle——74°61°-4°
AQI 45 (Good), driven by PM2.5. AQI up 12 over the last 6 hours (gradual rise). PM scrubbed by 2 hours of recent rain — PM2.5 down to 10.2 µg/m³, PM10 to 13.6 µg/m³.
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 48 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 48
- UV peak
- 1.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 48
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 10.2 µg/m³, PM10 to 13.6 µg/m³.
- PM2.5/PM10
- 0.75
- Wind
- light
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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
- 11:12 PM
- Moonset
- 10:13 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Waltham at a glance
- Today vs. normal: 14°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: 55982
16-Day Forecast — Waltham
- Sat82°65°21%
- Sun81°65°22%
- Mon81°65°4%
- Tue83°63°8%
- Wed79°66°53%
- Thu78°57°53%
- Fri74°61°8%
- Sat75°55°8%
- Sun75°56°12%
- Mon77°57°8%
- Tue80°60°6%
- Wed79°61°17%
- Thu78°65°26%
- Fri76°62°29%
- Sat71°57°17%
- Sun76°59°19%
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 — Waltham
SPC includes Waltham 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 Waltham
- 55982