Baltimore, Maryland Weather
Fireflies rise from the lawn. Day 77 of spring. Read this microseason across nine climate regions →
Baltimore weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Overcast——91°59°—
- FridayJun 5Overcast——95°63°+4°
- SaturdayJun 6Overcast24%—93°69°-2°
- SundayJun 7Showers24%—88°69°-5°
- MondayJun 8Light Drizzle——77°65°-11°
- TuesdayJun 9Mostly Clear——82°60°+5°
- WednesdayJun 10Partly Cloudy——88°64°+6°
Ozone at AQI 103 now. AQI up 16 in the last 6 hours — air quality is degrading. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 115 by mid-afternoon.
CAUTION Sensitive groups (children, elderly, respiratory conditions) should limit prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 103 now. With UV 8.4 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 115 by mid-afternoon.
- Present
- AQI 103
- UV peak
- 8.4 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 115
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
- 3:32 AM
- Moonset
- 1:08 PM
- In sign
- ♒︎ Aquarius
Fireflies rise from the lawn
Baltimore at a glance
- Today vs. normal: 14°F above the seasonal normal for this latitude
- Last frost: April 12 (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 — Baltimore
SPC has placed Baltimore 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 | 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
July brings Baltimore's warmest weather (~82°F mean) while January delivers the coldest (~37°F). Rainfall reaches its peak in July (4.7 inches) and drops to its lowest point in February (2.8 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 37° | 3.1″ | 6 |
| February | 39° | 2.8″ | 6 |
| March | 47° | 3.9″ | 7 |
| April | 58° | 3.5″ | 6 |
| May | 67° | 3.4″ | 7 |
| June | 77° | 3.4″ | 6 |
| July | 82° | 4.7″ | 7 |
| August | 79° | 4.3″ | 6 |
| September | 73° | 4.5″ | 5 |
| October | 61° | 3.5″ | 5 |
| November | 50° | 3.0″ | 5 |
| December | 41° | 3.7″ | 7 |
Regional context
Baltimore belongs to a warm-summer humid continental climate region. This classification groups the city with nearby areas that share similar temperature ranges, seasonal patterns, and growing conditions.
Similar climates: Hagerstown, MD, Frederick, MD, Waldorf, MD, Columbia, MD, Germantown, MD.
Naturalist notes
Late May brings the return of Baltimore orioles to the region, their orange and black plumage appearing in backyard trees as they build hanging nests.
Dogwood trees typically reach full bloom across Baltimore in mid-April, their white and pink flowers opening just as the last frost threat passes.
Frequently asked
- When does it freeze in Baltimore?
- Baltimore's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Baltimore?
- July is the wettest month with about 4.7 inches of rain on average; the city receives roughly 44 inches annually.
- What is the warmest month in Baltimore?
- July is typically warmest, averaging about 82°F.
- What is the coldest month in Baltimore?
- January is typically coldest, averaging about 37°F.
- When can I start a vegetable garden in Baltimore?
- 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 Baltimore get?
- Baltimore averages about 72 rainy days per year.
- What hardiness zone is Baltimore?
- Baltimore'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
Baltimore, Maryland experiences a warm-summer humid continental climate zone. January temperatures typically hover near 37°F while July averages 82°F — a 45°F seasonal swing.
Throughout the year, Baltimore receives about 44 inches of precipitation spread over roughly 72 rainy days.
Several factors determine the rhythm of the year: latitude (39.3°N), proximity to large water bodies, and elevation. These elements shape what grows here, when frost is likely, and what the weather story looks like day to day.