Portage, Michigan Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Portage weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——86°55°—
- FridayJun 5Light Showers84%0.71″78°66°-8°
- SaturdayJun 6Light Showers84%—78°65°0°
- SundayJun 7Overcast——82°61°+4°
- MondayJun 8Overcast11%—80°60°-2°
- TuesdayJun 9Light Drizzle31%—78°65°-2°
- WednesdayJun 10Drizzle26%—82°70°+4°
PM2.5 at 14.2 µg/m³ (AQI 61) with a 0.93 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust. AQI down 8 over the last 6 hours (steady decline since this morning).
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 14.2 µg/m³ (AQI 61) with a 0.93 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.93
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 4:18 AM
- Moonset
- 1:36 PM
- In sign
- ♑︎ Capricorn
Fireflies rise from the lawn
Portage at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: April 29 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 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 — Portage
SPC has placed Portage in the General Thunderstorms category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- 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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | — | — |
| May | lettuce, peas, spinach, radishes | lettuce, peas, radishes |
| June | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | tomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | — | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Portage's warmest month is July (~73°F mean) and its coldest is January (~25°F). Rainfall peaks in October (3.7 inches) and bottoms out in February (1.3 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 25° | 1.7″ | 4 |
| February | 27° | 1.3″ | 4 |
| March | 37° | 2.0″ | 5 |
| April | 49° | 3.1″ | 7 |
| May | 60° | 3.7″ | 9 |
| June | 69° | 3.2″ | 6 |
| July | 73° | 3.4″ | 6 |
| August | 71° | 3.7″ | 6 |
| September | 63° | 3.3″ | 6 |
| October | 52° | 3.7″ | 7 |
| November | 40° | 2.5″ | 6 |
| December | 30° | 1.7″ | 4 |
Regional context
Portage sits within a warm-summer humid continental climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Detroit, MI, Grand Rapids, MI, Lansing, MI, Ann Arbor, MI, Flint, MI.
Frequently asked
- When does it freeze in Portage?
- Portage's last spring frost typically falls around mid-May, and the first fall frost arrives around mid-October.
- What is the rainy season in Portage?
- October is the wettest month with about 3.7 inches of rain on average; the city receives roughly 33 inches annually.
- What is the warmest month in Portage?
- July is typically warmest, averaging about 73°F.
- What is the coldest month in Portage?
- January is typically coldest, averaging about 25°F.
- When can I start a vegetable garden in Portage?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-May); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Portage get?
- Portage averages about 69 rainy days per year.
- What hardiness zone is Portage?
- Portage's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Portage, Michigan sits in a warm-summer humid continental climate zone. January means hover near 25°F while July averages 73°F — a 48°F seasonal swing.
Across the year, Portage receives about 33 inches of precipitation spread over roughly 69 rainy days.
The rhythm of the year is set by latitude (42.2°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.