Onset, Massachusetts Weather
Solstice approaches — longest light. Day 88 of spring. Read this microseason across nine climate regions →
Onset weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Rain75%0.11″82°67°—
- TuesdayJun 16Overcast——73°60°-9°
- WednesdayJun 17Overcast——74°61°+1°
- ThursdayJun 18Drizzle20%0.01″74°62°0°
- FridayJun 19Overcast12%—77°62°+3°
- SaturdayJun 20Partly Cloudy11%—79°60°+2°
- SundayJun 21Overcast18%—77°56°-2°
AQI 47 (Good), driven by Ozone. AQI flat over the last 6 hours (within ±4 points). Ozone at AQI 46 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 46 — peak already passed at 1 PM under overcast skies. Levels should ease through evening.
- Present
- AQI 46
- UV peak
- 1.5 at earlier today
- Sky at peak
- overcast
- Projected peak
- AQI 46
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
- 5:04 AM
- Moonset
- 8:33 PM
- In sign
- ♋︎ Cancer
Solstice approaches — longest light
Onset at a glance
- Today vs. normal: 8°F above the seasonal normal for this latitude
- Last frost: April 26 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Onset
- Mon82°67°75%
- Tue73°60°0%
- Wed74°61°5%
- Thu74°62°20%
- Fri77°62°12%
- Sat79°60°11%
- Sun77°56°18%
- Mon66°59°27%
- Tue67°56°29%
- Wed69°55°13%
- Thu76°55°10%
- Fri69°60°29%
- Sat75°58°26%
- Sun78°58°26%
- Mon80°68°26%
- Tue78°69°19%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 15, 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.
ZIP codes in Onset
- 02558
- 02538