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

Westerville, Ohio Weather

Cicadas claim the scorching afternoon. Day 14 of summer. Read this microseason across nine climate regions →

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

Westerville, OH
Saturday, July 4 at 10:16 AM
84
°
Mostly Clear
Feels like
91°
Humidity
69%
Wind
6 mph
Sunrise
2:07 AM
Sunset
5:04 PM
Westerville, OH
Hour by hour · 24h
24-Hour ForecastWesterville, OH: 24-hour forecast. Temperatures range from 73 to 94 degrees Fahrenheit with a 37% chance of precipitation at 9 AM.
L 73°H 94°
Westerville, OH
7-day forecast
  1. Today
    Jul 4
    Overcast
    36%
    —
    94°71°—
  2. Sunday
    Jul 5
    Rain
    37%
    0.30″
    90°73°-4°
  3. Monday
    Jul 6
    Thunderstorm
    33%
    —
    80°66°-10°
  4. Tuesday
    Jul 7
    Light Drizzle
    16%
    —
    79°65°-1°
  5. Wednesday
    Jul 8
    Overcast
    16%
    —
    87°65°+8°
  6. Thursday
    Jul 9
    Thunderstorm
    48%
    —
    83°67°-4°
  7. Friday
    Jul 10
    Thunderstorm
    47%
    —
    78°70°-5°
Westerville, OH
Next 24 hours · Warm now
HOT 90°68°83°98°6a12p6p12anow 83°high 94°low 73°PRECIP %
Westerville, OH
Anemometer · 24h winds · from true
NESW
From · True
S
184° · backing 58°
Direction
S
184°
Sustained
6
mph
Gust
11
mph
Peak 24h
20
avg 5
Beaufort · 2 · LIGHT 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 5 · pk 20 @ 10:00p
01020MPHB1B2B3B4B5-21h-18h-15h-12h-9h-6h-3h-24hNOWpk 173SUSTGUST
−24h−18h−12h−6hnow
Light breeze backing 58° from the s.
Westerville, OH
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
985.1
+0.4 mb in 3h · steady · 29.09 inHg
Now
985.1
mb
3h
+0.4
mb
12h
-0.8
mb
24h
-3.0
mb
Regime · STORM
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 985–988
9809859909951000STORM|RAIN10051010RAIN|CHG1015CHG|FAIR10201025FAIR|DRY1030-21h-18h-15h-12h-9h-6h-3h-24hNOW988.4984.5985.3
−24h−18h−12h−6hnow
Deep low — expect rough seas, strong wind, and persistent rain.
Westerville, OH
Air quality
33
AQI
Good
↓-8 in 6h▲Peak ~62 @ 8 PM

AQI 33 (Good), driven by Ozone. AQI down 8 over the last 6 hours (gradual decline). Ozone at AQI 50 now. With UV 5.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 35 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 8 PM.

PM 2.5Good
8.8μg/m³
PM 10Good
10μg/m³
NO₂Good
6μg/m³
OzoneDRIVERUnhealthy SG
105μg/m³
UV IndexModerate
3.7

What's driving it

Ozone × UV × Sky

Ozone at AQI 50 now. With UV 5.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 35 around 1 PM.

Present
AQI 50
UV peak
5.2 at 1 PM
Sky at peak
clear
Projected peak
AQI 35

PM × Wind × Precip

PM2.5 at 8.8 µg/m³ (AQI 49) with a 0.88 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.

PM2.5/PM10
0.88
Wind
light
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).

7-DAY AQI TREND50100SATSUNMONTUEWEDTHUFRISAT7-DAY PM2.5 TREND · μg/m³300
Westerville, OH
Sky cover · visibility · 24h
Cloud cover
33%
MOSTLY CLEAR
100%0%−24h−18h−12h−6hnow
Visibility
47.7mi
UNLIMITED
94 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
14:16 UTC · Westerville, OH · 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
14:16 UTC · Westerville, OH · NOAA NESDIS / STAR · 5-min cadence · up to 10000 px
Westerville, OH
Satellite · infrared · animated
Westerville, OH
Loading IR frames…
IR · cloud-top temp© RainViewer · Carto
Westerville, OH
Almanac · Saturday, July 4
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
Civil dawn
5:36 AM
Sunrise
2:07 AM
Daylight
14h 57m
Sunset
5:04 PM
Civil dusk
9:38 PM
Planting note
Harvest early potatoes. Begin drying onions on the surface.
Westerville, OH
The moon
Waning Gibbous
81% illuminated
Moonrise
11:26 PM
Moonset
10:36 AM
In sign
♓︎ Pisces
Westerville, OH
Microseason
Jul 1–5

Cicadas claim the scorching afternoon

bird
Jan 151% of the yearDec 31

Read this microseason across nine climate regions →

Westerville at a glance

  • Today vs. normal: 12°F above the seasonal normal for this latitude
  • Last frost: April 17 (climatological average for this latitude)
  • Microseason: Jul 1–5
  • Planting window: Harvest early potatoes. Begin drying onions on the surface.

ZIP codes: 43081, 43082

16-Day Forecast — Westerville

  1. Sat94°71°36%
  2. Sun90°73°37%
  3. Mon80°66°33%
  4. Tue79°65°16%
  5. Wed87°65°16%
  6. Thu83°67°48%
  7. Fri78°70°47%
  8. Sat87°67°37%
  9. Sun73°62°28%
  10. Mon66°56°13%
  11. Tue78°62°14%
  12. Wed85°65°23%
  13. Thu86°68°27%
  14. Fri87°70°26%
  15. Sat86°69°45%
  16. Sun89°70°32%

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 — Westerville

SPC has placed Westerville in the Marginal Risk category for severe thunderstorms today.

  • TODAYMRGLMarginal Risk
  • TOMORROWTSTMGeneral Thunderstorms
  • DAY 3TSTMGeneral Thunderstorms

Isolated severe storms possible. Limited threat for hail or damaging wind.

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.

January 1–5: Frost quiets the live oaks.January 6–10: Still water thickens with ice.January 11–15: Springs begin to move beneath ice.January 16–20: Cardinal dawn calls grow bolder.January 21–25: Late January thaw pulses.January 26–31: Last freeze locks the land.February 1–5: February's lengthening light.February 6–10: Warming winds thaw the margin.February 11–15: Magnolia blooms break the gray.February 16–20: Mockingbirds resume the dawn chorus.February 21–25: Rain replaces the last snow.February 26–28: Mist clings to greening valleys.March 1–5: The green pulse awakens.March 6–10: Hibernators emerge to call.March 11–15: Dogwood and redbud ignite.March 16–20: Swallowtails emerge from winter silk.March 21–25: Light crowns the dogwood canopy.March 26–31: Redbud cascades over the thaw.April 1–5: Thunder announces the wet season.April 6–10: Barn swallows carve the warming sky.April 11–15: Magnolia blooms and falls in a breath.April 16–20: First rainbows arch over thunderheads.April 21–25: Reeds push through marsh water.April 26–30: Frost retreats; seedlings rise free.May 1–5: Warblers flood the canopy in waves.May 6–10: Tulip poplar lights the forest crown.May 11–15: Shad pulse upstream through rapids.May 16–20: Roses open on the Piedmont edge.May 21–25: Fireflies scout the humid dusk.May 26–31: Frog choruses rise from every wetland.June 1–5: Fireflies pulse through the magnolias.June 6–10: Kudzu climbs deeper into green.June 11–15: Sun climbs to its northern throne.June 16–20: Heat settles and the rain begins.June 21–25: The longest day turns toward shadow.June 26–30: Fireflies drift through Spanish moss.July 1–5: Cicadas claim the scorching afternoon.July 6–10: Thunderheads boil and break at dusk.July 11–15: Thunder builds each drowsy afternoon.July 16–20: Cicadas claim the long noon.July 21–25: Dog days drape the earth in haze.July 26–31: Katydids begin their rasping chorus.August 1–5: Dusk arrives one minute earlier each night.August 6–10: Meteorological summer's turning page.August 11–15: Cool winds gather at the margins.August 16–20: Dog-day cicadas rise.August 21–25: Heat breaks in creek beds.August 26–31: Monarchs gather strength.September 1–5: Harvests begin in earnest.September 6–10: Dew beads on resurrection fern.September 11–15: Raptors trail the thermals.September 16–20: Day and dark find balance.September 21–25: Thunder quiets the land.September 26–30: Insects retreat below.October 1–5: Swamp waters recede.October 6–10: Maples ignite the ridge.October 11–15: Asters crown the meadows.October 16–20: Crickets sing at dusk.October 21–25: Frost paints the garden.October 26–31: Light rains whisper down.November 1–5: Sweetgum Turns Crimson.November 6–10: Camellia Blooms Break Through.November 11–15: Earth Stiffens Underfoot.November 16–20: Bare Limbs Hold the Light.November 21–25: First Frost Grips the High Ground.November 26–30: North Wind Strips the Last Leaves.December 1–5: Darkness Falls Before Dinner.December 6–10: Winter Locks the Land.December 11–15: Wildlife Retreats to Shelter.December 16–20: Ice Edges Deepen Inward.December 21–25: The Sun Begins its 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 · July 1–5

Cicadas claim the scorching afternoon

Dog-day cicadas emerge in waves, their rasp dominating every sunny hour; heat peaks above 90 degrees daily.

Day 185 of 365 · Wedge 37 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——
Aprillettuce, peas, spinach, radishes—
Maylettuce, peas, spinach, radishes, tomatoes, peppers, beans, squashlettuce, peas, radishes
Junetomatoes, peppers, beans, squashlettuce, peas, radishes
Julytomatoes, peppers, beans, squashtomatoes, beans, summer squash
August—tomatoes, beans, summer squash
Septemberfall brassicas, garlic (overwinter), carrotstomatoes, beans, summer squash
Octoberfall brassicas, garlic (overwinter), carrotswinter squash, tomatoes (last)
November——
December——

A year in weather

July is Westerville's warmest stretch (~75°F) and January its coldest (~27°F); precipitation crests in May at 4.2 inches and ebbs in October to 2.6 inches.

MonthMean tempPrecipRainy days
January27°3.1″18
February30°2.9″15
March40°4.0″18
April52°4.1″19
May61°4.2″18
June70°4.0″15
July75°3.4″16
August74°3.2″15
September68°2.6″13
October56°2.6″12
November42°3.0″15
December32°3.7″17

Regional context

Per NOAA NCEI 1991-2020 normals, Westerville runs from a 27°F January mean to 75°F in July, a 48°F seasonal spread, with near 40.7 inches of precipitation across about 190 wet days.

Westerville's precipitation spreads evenly: May peaks at 4.2 inches on 18.3 wet days, while October holds 2.6 inches over 11.9 — no month dominates Westerville's rain calendar. That even rhythm groups Westerville with places like Huber Ridge, OH, Minerva Park, OH and Worthington, OH.

Westerville reaches its last hard frost near mid-April; that is the cue for kale, peas, spinach, and parsnips. Tomatoes and peppers do best set out two weeks later in Westerville, once nights clear the mid-40s°F. Frost returns to Westerville near mid-November, ending the tender-crop season. A creek-bottom lot in Westerville can lag Westerville's last frost 7-10 days behind a south slope.

Similar climates: Huber Ridge, OH, Minerva Park, OH, Worthington, OH, Riverlea, OH, Galena, OH.

Frequently asked

When does it freeze in Westerville?
In Westerville, expect the last spring frost near mid-April; Westerville's first autumn frost comes around mid-November.
What is the rainy season in Westerville?
May is the wettest month in Westerville, about 4.2 inches on average; the year totals roughly 41 inches.
What is the warmest month in Westerville?
Westerville peaks in July, when the mean runs near 75°F.
What is the coldest month in Westerville?
January is Westerville's coldest month, averaging about 27°F.
When can I start a vegetable garden in Westerville?
In Westerville, sow peas and hardy greens around mid-April; Westerville's tomatoes and peppers wait two weeks more.
How many rainy days does Westerville get?
Westerville averages about 190 days with measurable rain or snow each year.
What hardiness zone is Westerville?
With January around 27°F, Westerville's zone reflects that minimum — the USDA ZIP map confirms Westerville's band.
What is the 10-day forecast for Westerville?
Westerville'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 Westerville?
See this week's day-by-day rain chances for Westerville in the daily forecast above, and the next 24 hours in the hourly chart.
What is the weather like right now in Westerville?
Current conditions for Westerville and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
How often is the Westerville forecast updated?
The Westerville forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
When are sunrise and sunset in Westerville?
Today's sunrise and sunset times for Westerville 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 Westerville?
The next few days in Westerville's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.

Climate

Set in a humid subtropical zone, Westerville, Ohio swings from 27°F in the heart of winter to 75°F at midsummer — a 48°F arc.

Yearly precipitation in Westerville totals around 41 inches, spread over about 190 days of rain or snow.

Westerville's 48°F range, set by its 40.1°N position, drives frost timing and what thrives in Westerville.

All cities in Ohio →

Columbus, OH weather →

ZIP codes in Westerville

  • 43081
  • 43082
  • 43086

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.