Onset, Massachusetts Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
Onset weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Drizzle64%0.04″83°71°—
- MondayJul 6Overcast73%—80°67°-3°
- TuesdayJul 7Heavy Drizzle83%0.22″67°62°-13°
- WednesdayJul 8Overcast24%—70°59°+3°
- ThursdayJul 9Overcast——73°60°+3°
- FridayJul 10Thunderstorm28%—83°66°+10°
- SaturdayJul 11Overcast15%—79°62°-4°
AQI 31 (Good), driven by PM2.5. AQI down 22 over the last 6 hours — air quality is improving sharply. PM2.5 at 9.0 µg/m³, PM10 at 9.5 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 9.0 µg/m³, PM10 at 9.5 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.95
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:00 PM
- Moonset
- 10:51 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
Onset at a glance
- Today vs. normal: 71°F — typical for the season
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 02558
15-Day Forecast — Onset
- Sun83°71°64%
- Mon80°67°73%
- Tue67°62°83%
- Wed70°59°24%
- Thu73°60°5%
- Fri83°66°28%
- Sat79°62°15%
- Sun79°62°13%
- Mon74°60°19%
- Tue79°58°20%
- Wed78°65°15%
- Thu80°65°29%
- Fri83°72°19%
- Sat82°70°45%
- Sun82°69°23%
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 — Onset
SPC includes Onset in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- 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 Onset
- 02558
- 02538