Manitowoc, Wisconsin Weather
Day 93 of summer. Read today’s microseason across nine climate regions →
Manitowoc weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:50 AM CDT · Open-Meteo
- TodaySep 21Overcast——59°53°—
- TuesdaySep 22Partly Cloudy——61°49°+2°
- WednesdaySep 23Clear——65°55°+4°
- ThursdaySep 24Overcast——65°57°0°
- FridaySep 25Overcast——65°55°0°
- SaturdaySep 26Overcast——66°55°+1°
- SundaySep 27Overcast——68°51°+2°
Air quality now AQI 31 · Good
AQI 31 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±3 points). Ozone at AQI 31. Overcast through the UV peak window (cloud cover ~89%) — 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 31. Overcast through the UV peak window (cloud cover ~89%) — afternoon ozone should stay flat.
- Present
- AQI 31
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 7
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:36 PM
- Moonset
- 12:57 AM
- In sign
- ♑︎ Capricorn
Manitowoc at a glance
- Today vs. normal: Today averages 56°F (high 59°F, low 53°F), 2°F below the 58°F normal for Sep 21
- Last frost: April 30 (1991–2020 median, NOAA station 3 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Manitowoc
- Mon59°53°1%
- Tue61°49°5%
- Wed65°55°1%
- Thu65°57°1%
- Fri65°55°1%
- Sat66°55°2%
- Sun68°51°9%
- Mon68°52°16%
- Tue63°55°27%
- Wed67°47°24%
- Thu70°50°16%
- Fri66°55°16%
- Sat70°58°19%
- Sun67°59°16%
- Mon65°52°21%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 20) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Manitowoc
Manitowoc sits in Manitowoc County, where the year’s longest day runs 15h 30m of daylight and its shortest just 8h 52m — a swing of +6h 38m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Milwaukee, the state’s largest city, lies about 73 miles to the SSW. The nearest town Manitowoc tracks is Green Bay, roughly 33 miles to the NNW.
Air quality in Manitowoc
Air quality in Manitowoc’s county has held roughly steady since 2020; its cleanest year on record was 2020 (median AQI 36).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash | lettuce, peas, spinach, garlic |
| August | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
The year in Manitowoc tops out in July (~69°F) and dips lowest in January (~20°F), with June wettest at 4.0 inches and February driest at 1.2 inches.
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 20° | 1.8″ | 8 |
| February | 23° | 1.2″ | 7 |
| March | 32° | 1.8″ | 7 |
| April | 42° | 3.3″ | 9 |
| May | 53° | 3.4″ | 11 |
| June | 63° | 4.0″ | 10 |
| July | 69° | 3.5″ | 10 |
| August | 68° | 3.4″ | 9 |
| September | 61° | 2.4″ | 9 |
| October | 49° | 2.9″ | 10 |
| November | 37° | 2.0″ | 8 |
| December | 26° | 1.6″ | 7 |
Regional context
Similar climates Two Rivers, WI, Francis Creek, WI, Whitelaw, WI
Drawing on NOAA NCEI 1991-2020 normals, Manitowoc's January averages 20°F and July 69°F — 49°F apart — while precipitation totals roughly 31.4 inches over some 104 days.
Precipitation in Manitowoc runs summer-dominant: June averages 4.0 inches across 10.2 days of warm-season storms, while February drops to 1.2 inches over 6.6 rainy days of drier cool air. That puts Manitowoc in a summer-convective cohort with places like Two Rivers, WI, Francis Creek, WI and Whitelaw, WI.
By April 30 the frosts ease in Manitowoc, opening the season for kale, peas, spinach, and parsnips. Warm-soil crops in Manitowoc wait about two weeks past Manitowoc's last frost, once the soil warms. Manitowoc's window closes around October 20 as Manitowoc's overnight lows return below freezing. In about half of years, Manitowoc's last freeze comes after April 30.
Similar climates: Two Rivers, WI, Francis Creek, WI, Whitelaw, WI, Clarks Mills, WI, Mishicot, WI.
Frequently asked
- When does it freeze in Manitowoc?
- Manitowoc's last spring frost lands near April 30, and in Manitowoc the first fall frost follows around October 20.
- What is the rainy season in Manitowoc?
- Manitowoc sees its heaviest rain in June (around 4.0 inches), part of roughly 31 inches a year.
- What is the warmest month in Manitowoc?
- On average July tops the year in Manitowoc at about 69°F.
- What is the coldest month in Manitowoc?
- The coldest stretch in Manitowoc falls in January, around 20°F on average.
- When can I start a vegetable garden in Manitowoc?
- In Manitowoc, sow peas and hardy greens around April 30; Manitowoc's tomatoes and peppers wait two weeks more.
- How many rainy days does Manitowoc get?
- Manitowoc averages about 104 days with measurable rain or snow each year.
- What hardiness zone is Manitowoc?
- Because Manitowoc bottoms near 20°F in January, that winter low sets Manitowoc's USDA zone — verify by ZIP.
- What is the 10-day forecast for Manitowoc?
- Manitowoc's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Manitowoc?
- See this week's day-by-day rain chances for Manitowoc in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Manitowoc?
- Current conditions for Manitowoc and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Manitowoc forecast updated?
- The Manitowoc forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Manitowoc?
- Today's sunrise and sunset times for Manitowoc are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Manitowoc?
- The next few days in Manitowoc's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Manitowoc sits at 44.1°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Manitowoc
- 54220