Chelsea, Massachusetts Weather
Solstice approaches — longest light. Day 88 of spring. Read this microseason across nine climate regions →
Chelsea weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 15Rain51%0.15″83°68°—
- TuesdayJun 16Overcast——79°60°-4°
- WednesdayJun 17Overcast——75°59°-4°
- ThursdayJun 18Light Showers30%0.12″84°62°+9°
- FridayJun 19Overcast27%—81°67°-3°
- SaturdayJun 20Overcast——70°62°-11°
- SundayJun 21Light Drizzle16%0.06″78°58°+8°
AQI 50 (Good), driven by Ozone. AQI down 35 over the last 6 hours — air quality is improving sharply. Ozone at AQI 47 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 15 around 1 PM.
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 47 now. With UV 3.3 peaking around 1 PM under partly cloudy skies, surface ozone likely climbs to AQI 15 around 1 PM.
- Present
- AQI 47
- UV peak
- 3.3 at 1 PM
- Sky at peak
- partly cloudy
- Projected peak
- AQI 15
PM × Wind × Precip
PM scrubbed by 2 hours of recent rain — PM2.5 down to 5.2 µg/m³, PM10 to 6.2 µg/m³.
- PM2.5/PM10
- 0.84
- Wind
- breezy
- Recent rain
- 2h in last 6h
- Pattern
- washed out
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
- 5:02 AM
- Moonset
- 8:38 PM
- In sign
- ♊︎ Gemini
Solstice approaches — longest light
Chelsea at a glance
- Today vs. normal: 5°F below the seasonal normal for this latitude
- Last frost: April 30 (climatological average for this latitude)
- Microseason: Jun 11–15
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Chelsea
- Mon83°68°51%
- Tue79°60°0%
- Wed75°59°7%
- Thu84°62°30%
- Fri81°67°27%
- Sat70°62°5%
- Sun78°58°16%
- Mon62°55°25%
- Tue76°57°28%
- Wed71°61°16%
- Thu74°60°14%
- Fri74°59°39%
- Sat78°59°40%
- Sun70°61°33%
- Mon77°65°31%
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 Chelsea
- 02150
- 02204