Cambridge, Massachusetts Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Cambridge weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Light Drizzle13%0.01″82°68°—
- MondayJul 6Light Drizzle64%0.02″77°63°-5°
- TuesdayJul 7Rain73%0.52″64°60°-13°
- WednesdayJul 8Overcast27%—70°59°+6°
- ThursdayJul 9Overcast12%—84°57°+14°
- FridayJul 10Light Drizzle37%0.04″85°63°+1°
- SaturdayJul 11Overcast15%—83°58°-2°
AQI 51 (Moderate), driven by PM2.5. AQI up 12 over the last 6 hours (gradual rise). PM2.5 at 22.4 µg/m³ (AQI 76) with a 0.95 fine-to-coarse ratio and 4 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 5 PM.
What's driving it
PM × Wind × Precip
PM2.5 at 22.4 µg/m³ (AQI 76) with a 0.95 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.95
- 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
- 10:53 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Cambridge at a glance
- Today vs. normal: 71°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 codes: 02138, 02139, 02140, 02141, 02142
15-Day Forecast — Cambridge
- Sun83°68°13%
- Mon77°63°64%
- Tue64°60°73%
- Wed70°59°27%
- Thu84°57°12%
- Fri85°63°37%
- Sat83°58°15%
- Sun82°61°13%
- Mon67°56°18%
- Tue80°54°20%
- Wed85°63°14%
- Thu89°61°26%
- Fri91°69°19%
- Sat89°69°27%
- Sun92°66°29%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Cambridge
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 — Cambridge
SPC includes Cambridge 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 Cambridge
- 02142
- 02140
- 02141
- 02139
- 02138
- 02238
- 02477