Marlborough, Massachusetts Weather
Honeysuckle sweetens the night. Day 91 of spring. Read this microseason across nine climate regions →
Marlborough weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 18Light Drizzle32%0.01″84°63°—
- FridayJun 19Overcast——78°63°-6°
- SaturdayJun 20Overcast——76°59°-2°
- SundayJun 21Light Drizzle24%—76°54°0°
- MondayJun 22Rain61%0.80″69°55°-7°
- TuesdayJun 23Overcast54%—80°54°+11°
- WednesdayJun 24Overcast12%—83°54°+3°
AQI 46 (Good), driven by PM2.5. AQI down 36 over the last 6 hours — air quality is improving sharply. PM2.5 at 8.8 µg/m³, PM10 at 11.4 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
Ozone × UV × Sky
Ozone at AQI 43. Overcast through the UV peak window (cloud cover ~97%) — afternoon ozone should stay flat.
- Present
- AQI 43
- UV peak
- 3.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 10
PM × Wind × Precip
PM2.5 at 8.8 µg/m³, PM10 at 11.4 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.77
- 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).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 8:53 AM
- Moonset
- 11:08 PM
- In sign
- ♌︎ Leo
Honeysuckle sweetens the night
Marlborough at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: April 30 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
15-Day Forecast — Marlborough
- Thu84°63°32%
- Fri78°63°0%
- Sat76°59°3%
- Sun76°54°24%
- Mon69°55°61%
- Tue80°54°54%
- Wed83°54°12%
- Thu75°57°29%
- Fri80°60°35%
- Sat85°56°28%
- Sun79°59°26%
- Mon85°60°30%
- Tue79°60°39%
- Wed75°59°40%
- Thu81°63°32%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 18, 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 — Marlborough
SPC has placed Marlborough in the Slight Risk category for severe thunderstorms today.
- TODAYSLGTSlight Risk
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
Scattered severe storms possible. A few tornadoes, hail, and damaging wind gusts possible.
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 Marlborough
- 01752