Westerville, Ohio Weather
Fireflies pulse through the magnolias. Day 77 of spring. Read this microseason across nine climate regions →
Westerville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Mostly Clear——83°54°—
- FridayJun 5Overcast——86°59°+3°
- SaturdayJun 6Light Showers71%0.02″81°68°-5°
- SundayJun 7Showers65%—83°66°+2°
- MondayJun 8Light Showers13%—81°64°-2°
- TuesdayJun 9Light Drizzle15%—81°67°0°
- WednesdayJun 10Drizzle23%—80°66°-1°
Ozone at AQI 106 — peak already passed at 1 PM under clear skies. AQI up 23 in the last 6 hours — air quality is degrading. Levels should ease through evening.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 106 — peak already passed at 1 PM under clear skies. Levels should ease through evening.
- Present
- AQI 106
- UV peak
- 5.0 at earlier today
- Sky at peak
- clear
- Projected peak
- AQI 106
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
- 4:00 AM
- Moonset
- 1:31 PM
- In sign
- ♒︎ Aquarius
Fireflies pulse through the magnolias
Westerville at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 17 (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 — Westerville
SPC has placed Westerville in the Slight Risk category for severe thunderstorms day after tomorrow.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- DAY 3SLGTSlight Risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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 | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
Westerville's warmest month is July (~75°F mean) and its coldest is January (~29°F). Rainfall peaks in May (4.8 inches) and bottoms out in February (2.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 29° | 3.1″ | 7 |
| February | 31° | 2.6″ | 9 |
| March | 41° | 3.9″ | 8 |
| April | 53° | 4.0″ | 9 |
| May | 63° | 4.8″ | 10 |
| June | 72° | 4.7″ | 9 |
| July | 75° | 4.3″ | 8 |
| August | 73° | 3.8″ | 7 |
| September | 66° | 3.8″ | 7 |
| October | 55° | 3.2″ | 8 |
| November | 43° | 3.0″ | 7 |
| December | 34° | 3.4″ | 8 |
Regional context
Westerville sits within a humid subtropical climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Cincinnati, OH, Columbus, OH, Dayton, OH, Middletown, OH, Newark, OH.
Frequently asked
- When does it freeze in Westerville?
- Westerville's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Westerville?
- May is the wettest month with about 4.8 inches of rain on average; the city receives roughly 45 inches annually.
- What is the warmest month in Westerville?
- July is typically warmest, averaging about 75°F.
- What is the coldest month in Westerville?
- January is typically coldest, averaging about 29°F.
- When can I start a vegetable garden in Westerville?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Westerville get?
- Westerville averages about 95 rainy days per year.
- What hardiness zone is Westerville?
- Westerville'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
Westerville, Ohio sits in a humid subtropical climate zone. January means hover near 29°F while July averages 75°F — a 46°F seasonal swing.
Across the year, Westerville receives about 45 inches of precipitation spread over roughly 95 rainy days.
The rhythm of the year is set by latitude (40.1°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.