Chelsea, Massachusetts Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Chelsea weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Light Drizzle—0.01″80°67°—
- MondayJul 6Light Drizzle63%0.02″73°64°-7°
- TuesdayJul 7Showers72%0.69″64°61°-9°
- WednesdayJul 8Overcast29%—66°61°+2°
- ThursdayJul 9Overcast13%—82°59°+16°
- FridayJul 10Light Drizzle36%0.05″83°65°+1°
- SaturdayJul 11Overcast14%—77°60°-6°
AQI 28 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 9.0 µg/m³ (AQI 50) with a 0.99 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 4 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 9.0 µg/m³ (AQI 50) with a 0.99 fine-to-coarse ratio and 3 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.99
- Wind
- calm
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:02 PM
- Moonset
- 10:52 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Chelsea at a glance
- Today vs. normal: 68°F — typical for the season
- Last frost: April 30 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 02150
15-Day Forecast — Chelsea
- Sun80°67°9%
- Mon73°64°63%
- Tue64°61°72%
- Wed66°61°29%
- Thu82°59°13%
- Fri83°65°36%
- Sat77°60°14%
- Sun79°63°12%
- Mon67°57°18%
- Tue74°56°19%
- Wed82°64°13%
- Thu85°63°26%
- Fri87°69°19%
- Sat83°70°27%
- Sun87°67°29%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 — Chelsea
SPC includes Chelsea in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- 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.
ZIP codes in Chelsea
- 02150
- 02204