Weather StoryAlmanac, microseasons, and the day's weather story.

Ann Arbor, Michigan Weather

Night falls a minute earlier. Day 43 of summer. Read this microseason across nine climate regions →

Ann Arbor weather forecast — hour by hour, 7-day outlook, NOAA radar

Ann Arbor, MI
Sunday, August 2 at 10:58 AM
68
°
Overcast
Feels like
69°
Humidity
87%
Wind
10 mph
Sunrise
2:29 AM
Sunset
4:53 PM
Ann Arbor, MI
Hour by hour · 24h
24-Hour ForecastAnn Arbor, MI: 24-hour forecast. Temperatures range from 60 to 75 degrees Fahrenheit with a 48% chance of precipitation at 10 AM.
L 60°H 75°
Ann Arbor, MI
7-day forecast
  1. Today
    Aug 2
    Light Rain
    80%
    0.11″
    75°64°—
  2. Monday
    Aug 3
    Clear
    —
    —
    82°60°+7°
  3. Tuesday
    Aug 4
    Clear
    —
    —
    86°57°+4°
  4. Wednesday
    Aug 5
    Mostly Clear
    —
    —
    91°58°+5°
  5. Thursday
    Aug 6
    Drizzle
    56%
    0.01″
    86°66°-5°
  6. Friday
    Aug 7
    Overcast
    36%
    —
    91°65°+5°
  7. Saturday
    Aug 8
    Thunderstorm
    19%
    —
    91°65°0°
Ann Arbor, MI
Next 24 hours · Mild now
56°67°78°12p6p12a6anow 67°high 75°low 60°PRECIP %
Ann Arbor, MI
Anemometer · 24h winds · from true
NESW
From · True
NNE
027° · steady
Direction
NNE
027°
Sustained
10
mph
Gust
20
mph
Peak 24h
26
avg 7 mph
Beaufort · 3 · GENTLE BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 mph · pk 26 mph @ 2:00a
0102030MPHB1B2B3B4B5B6-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 237SUSTGUST
−24h−18h−12h−6hnow
Light breeze holding from the nne.
Ann Arbor, MI
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
976.8
+1.4 mb in 3h · rising · 28.84 inHg
Now
976.8
mb
3h
+1.4
mb
12h
-0.5
mb
24h
-1.4
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 975–978
970975980985-21h-18h-15h-12h-9h-6h-3h-24hNOW978.4975.3976.7
The low is filling — pressure climbing out of storm territory.
Ann Arbor, MI
Air quality
65
AQI
Moderate
↓-5 in 6h

AQI 65 (Moderate), driven by PM2.5. AQI down 5 over the last 6 hours (gradual decline). PM2.5 at 15.8 µg/m³, PM10 at 15.9 µg/m³ — typical background levels with no transport signature.

OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.

PM 2.5DRIVERModerate
15.8μg/m³
PM 10Good
16μg/m³
NO₂Good
8μg/m³
OzoneModerate
71μg/m³
UV IndexLow
0.6

What's driving it

Ozone × UV × Sky

Ozone at AQI 34. Overcast through the UV peak window (cloud cover ~100%) — afternoon ozone should stay flat.

Present
AQI 34
UV peak
0.8 at 1 PM
Sky at peak
overcast
Projected peak
AQI 4

PM × Wind × Precip

PM2.5 at 15.8 µg/m³, PM10 at 15.9 µg/m³ — typical background levels with no transport signature.

PM2.5/PM10
0.99
Wind
breezy
Recent rain
0h in last 6h
Pattern
background

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).

7-DAY AQI TREND50100SUNMONTUEWEDTHUFRISATSUN7-DAY PM2.5 TREND · μg/m³520
Ann Arbor, MI
Sky cover · visibility · 24h
Cloud cover
100%
OVERCAST
100%0%−24h−18h−12h−6hnow
Visibility
30.4mi
UNLIMITED
70 mi0 mi−24h−18h−12h−6hnow
Earth · GOES-19 ABI
Full Disk · Visible · GeoColor
GOES-19 full disk Visible · GeoColor
True-color daytime, blue/IR sandwich at night
14:58 UTC · Ann Arbor, MI · NOAA NESDIS / STAR · up to 10848 px
Continental US · GOES-19 ABI
CONUS Sector · Visible · GeoColor
GOES-19 CONUS Visible · GeoColor
Daytime true-color, blue-light/IR sandwich at night
14:58 UTC · Ann Arbor, MI · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Ann Arbor, MI
Satellite · infrared · animated
Ann Arbor, MI
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Ann Arbor, MI
Almanac · Sunday, August 2
Red sky at night, sailor's delight.
Civil dawn
5:58 AM
Sunrise
2:29 AM
Daylight
14h 24m
Sunset
4:53 PM
Civil dusk
9:26 PM
Planting note
Sow fall peas. Start kale and collard seedlings for fall.
Ann Arbor, MI
The moon
Waning Gibbous
84% illuminated
Moonrise
10:18 PM
Moonset
10:39 AM
In sign
♓︎ Pisces
Ann Arbor, MI
Microseason
Aug 1–5

Night falls a minute earlier

celestial
Jan 159% of the yearDec 31

Read this microseason across nine climate regions →

Ann Arbor at a glance

  • Today vs. normal: 8°F above the seasonal normal for this latitude
  • Last frost: April 30 (climatological average for this latitude)
  • Microseason: Aug 1–5
  • Planting window: Sow fall peas. Start kale and collard seedlings for fall.

ZIP codes: 48103, 48104, 48105, 48108, 48109

16-Day Forecast — Ann Arbor

  1. Sun75°64°80%
  2. Mon82°60°0%
  3. Tue86°57°0%
  4. Wed91°58°5%
  5. Thu86°66°56%
  6. Fri91°65°36%
  7. Sat91°65°19%
  8. Sun99°71°31%
  9. Mon92°73°31%
  10. Tue85°66°22%
  11. Wed75°63°22%
  12. Thu96°68°34%
  13. Fri97°74°42%
  14. Sat96°73°24%
  15. Sun85°61°19%
  16. Mon78°63°16%

Forecast data from Open-Meteo (CC BY 4.0).

Live wind & temperature near Ann Arbor

Right now in the garden

Peak growing season

As of August 2, 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 — Ann Arbor

SPC includes Ann Arbor in the general thunderstorm area today — no severe risk, but storms are possible.

  • TODAYTSTMGeneral Thunderstorms
  • TOMORROWNONENo severe risk
  • 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.

Sun & seasons in Ann Arbor

Ann Arbor sits in Washtenaw County, where the year’s longest day runs 15h 16m of daylight and its shortest just 9h 5m — a swing of +6h 12m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.

Detroit, the state’s largest city, lies about 33 miles to the ENE. The nearest town Ann Arbor tracks is South Lyon, roughly 13 miles to the NNE.

Air quality in Ann Arbor’s county has held roughly steady since 2020; its cleanest year on record was 2025 (median AQI 41). See the full air-quality history for Ann Arbor.

January 1–5: The year turns in silence.January 6–10: Ice thickens on still water.January 11–15: Shortest shadows lengthen.January 16–20: Pheasants begin to call.January 21–25: Springs begin to thaw.January 26–31: Chickadees announce dawn.February 1–5: East wind softens the frost.February 6–10: Sap begins to rise.February 11–15: First snowdrops appear.February 16–20: Red-winged blackbirds return.February 21–25: Rain begins to replace snow.February 26–28: Skunk cabbage pushes through ice.March 1–5: Ice withdraws from the reservoir.March 6–10: Crocuses open to weak sun.March 11–15: Peepers call from the marsh.March 16–20: Woodcocks spiral at dusk.March 21–25: Equinox — light overtakes dark.March 26–31: Forsythia opens along the fences.April 1–5: Cherry blossoms drift like snow.April 6–10: Warblers appear in the understory.April 11–15: Magnolias bloom and fall in a day.April 16–20: Dogwoods float above the forest.April 21–25: Lilacs perfume the evening.April 26–30: Last frost releases the garden.May 1–5: Warblers flood the Ramble.May 6–10: Tulip poplars light their candles.May 11–15: Shad run up the rivers.May 16–20: Roses open along the stoops.May 21–25: Firefly scouts appear at dusk.May 26–31: Strawberries ripen in the sun.June 1–5: Fireflies rise from the lawn.June 6–10: Elderflowers open in hedgerows.June 11–15: Solstice approaches — longest light.June 16–20: Honeysuckle sweetens the night.June 21–25: Solstice — the sun stands still.June 26–30: Lightning bugs drift through oaks.July 1–5: Cicadas claim the afternoon.July 6–10: Queen Anne's lace lines the roads.July 11–15: Thunder builds each afternoon.July 16–20: Corn reaches for the tassels.July 21–25: Dog days settle in the haze.July 26–31: Katydids begin their chorus.August 1–5: Night falls a minute earlier.August 6–10: Sunflowers face the morning.August 11–15: Goldenrod begins to bloom.August 16–20: Crickets pulse through warm nights.August 21–25: First cool morning surprises.August 26–31: Monarchs stage for flight.September 1–5: School buses reappear.September 6–10: Asters purple the roadsides.September 11–15: Hawk migration over the Hudson.September 16–20: Equinox — dark overtakes light.September 21–25: Apples hang heavy on the branch.September 26–30: Geese begin to chevron south.October 1–5: Witch hazel blooms as others fade.October 6–10: Maples begin to blaze.October 11–15: Frost paints the garden black.October 16–20: Oaks turn bronze and russet.October 21–25: Leaves rattle down the gutters.October 26–31: Clocks fall back — dusk at five.November 1–5: Ginkgos drop overnight.November 6–10: Last leaves cling stubbornly.November 11–15: Juncos arrive from the north.November 16–20: Bare branches reveal the sky.November 21–25: First flurries dust the rooftops.November 26–30: Woodsmoke curls through the block.December 1–5: Darkness settles before dinner.December 6–10: Holly and winterberry persist.December 11–15: Shortest day approaches.December 16–20: Ice begins to form at the edges.December 21–25: Solstice — the sun begins return.December 26–31: The year turns in silence.🌱February 14 — First skunk-cabbage spathes thaw their way up☀️March 20 — Spring equinox — day and night balance🌸April 5 — Cherry blossoms peak in the parks🐦May 10 — Warbler migration peaks along the coast✨May 25 — First fireflies scout the meadows at dusk🌞June 21 — Summer solstice — longest day🦗July 25 — Peak cicada chorus in the afternoons🌊August 18 — Warmest sea-surface temperatures of the year🍂September 22 — Autumn equinox — the slow turn❄️October 25 — First widespread frost in the suburbs🍁November 10 — Peak leaf color across the Hudson Valley🌙December 21 — Winter solstice — longest night

Microseason · August 1–5

Night falls a minute earlier

Sunset retreats perceptibly — daylight shortening speeds up.

Day 214 of 365 · Wedge 43 of 72

The solar year drawn as a wheel of 72 five-day windows. Each wedge is one microseason; the four colored arcs mark winter, spring, summer, and autumn; the small icons sit at notable phenological events. The crimson pointer creeps clockwise as the year turns.

Planting calendar

MonthPlantHarvest
January——
February——
March——
April——
Maylettuce, peas, spinach, radisheslettuce, peas, radishes
Junelettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
Augusttomatoes, peppers, beans, squash, fall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
October—winter squash, tomatoes (last)
November——
December——

A year in weather

July is Ann Arbor's warmest stretch (~72°F) and January its coldest (~24°F); precipitation crests in June at 4.3 inches and ebbs in February to 2.4 inches.

MonthMean tempPrecipRainy days
January24°2.8″8
February26°2.4″6
March35°2.8″6
April46°3.3″7
May58°3.8″8
June68°4.3″7
July72°3.9″7
August70°3.3″6
September62°3.0″6
October51°2.9″7
November39°2.7″7
December29°2.6″7

Regional context

By the nearest station's NOAA NCEI 1991-2020 normals, Ann Arbor sees 24°F Januarys and 72°F Julys, a 48°F range, plus around 37.9 inches of precipitation across 82 days.

Ann Arbor's precipitation spreads evenly: June peaks at 4.3 inches on 6.9 wet days, while February holds 2.4 inches over 6.2 — no month dominates Ann Arbor's rain calendar. It is a balanced pattern Ann Arbor shares with places like Barton Hills, MI, Ypsilanti, MI and Saline, MI.

By late-May the frosts ease in Ann Arbor, opening the season for kale, peas, spinach, and parsnips. In Ann Arbor, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Ann Arbor's frost date. Around early-October, freezing nights resume in Ann Arbor and tender crops must come in. Within Ann Arbor, cold-air pooling chills low spots by 5-10°F, shifting Ann Arbor's local frost dates.

Similar climates: Barton Hills, MI, Ypsilanti, MI, Saline, MI, Dexter, MI, Whitmore Lake, MI.

Naturalist notes

Late May brings the emergence of wild columbine blooms throughout local woodlands, their distinctive spurred flowers appearing as soil temperatures stabilize after the final frost.

American robins begin their second nesting cycle in early June, with pairs selecting fresh sites in maples and oaks as daylight stretches past 15 hours.

Frequently asked

When does it freeze in Ann Arbor?
Ann Arbor's last spring frost lands near mid-May, and in Ann Arbor the first fall frost follows around mid-October.
What is the rainy season in Ann Arbor?
Ann Arbor sees its heaviest rain in June (around 4.3 inches), part of roughly 38 inches a year.
What is the warmest month in Ann Arbor?
Ann Arbor peaks in July, when the mean runs near 72°F.
What is the coldest month in Ann Arbor?
January is Ann Arbor's coldest month, averaging about 24°F.
When can I start a vegetable garden in Ann Arbor?
Around mid-May, start frost-hardy crops in Ann Arbor; tomatoes and basil belong a fortnight later.
How many rainy days does Ann Arbor get?
Ann Arbor averages about 82 days with measurable rain or snow each year.
What hardiness zone is Ann Arbor?
Since January in Ann Arbor averages 24°F, Ann Arbor's USDA zone follows that floor — confirm it by ZIP.
What is the 10-day forecast for Ann Arbor?
Ann Arbor'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 Ann Arbor?
See this week's day-by-day rain chances for Ann Arbor in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Ann Arbor?
Current conditions for Ann Arbor and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Ann Arbor forecast updated?
The Ann Arbor forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Ann Arbor?
Today's sunrise and sunset times for Ann Arbor 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 Ann Arbor?
The next few days in Ann Arbor's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

In Ann Arbor, Michigan, the warm-summer humid continental climate runs from about 24°F in January to 72°F in July, a 48°F seasonal range.

Rain and snow bring Ann Arbor roughly 38 inches a year across approximately 82 measurable-precipitation days.

From 42.3°N, Ann Arbor sees a 48°F seasonal swing that governs Ann Arbor's planting and frost windows.

All cities in Michigan →

Detroit, MI weather →

ZIP codes in Ann Arbor

  • 48103
  • 48104
  • 48105
  • 48108
  • 48109
  • 48113

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.