South Dennis, Massachusetts Weather
Cicadas claim the afternoon. Day 15 of summer. Read this microseason across nine climate regions →
South Dennis weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Rain77%0.22″79°67°—
- MondayJul 6Overcast67%—76°64°-3°
- TuesdayJul 7Drizzle81%0.14″67°62°-9°
- WednesdayJul 8Overcast22%—67°61°0°
- ThursdayJul 9Overcast——70°63°+3°
- FridayJul 10Drizzle20%—78°69°+8°
- SaturdayJul 11Overcast15%—76°69°-2°
AQI 41 (Good), driven by PM2.5. AQI down 60 over the last 6 hours — air quality is improving sharply. PM2.5 at 12.1 µg/m³ (AQI 57) with a 0.79 fine-to-coarse ratio and 6 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.
What's driving it
Ozone × UV × Sky
Ozone at AQI 33. Overcast through the UV peak window (cloud cover ~77%) — afternoon ozone should stay flat.
- Present
- AQI 33
- UV peak
- 0.3 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 4
PM × Wind × Precip
PM2.5 at 12.1 µg/m³ (AQI 57) with a 0.79 fine-to-coarse ratio and 6 mph wind — combustion smoke trapped in calm air, not road dust.
- PM2.5/PM10
- 0.79
- Wind
- light
- 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
- 10:58 PM
- Moonset
- 10:49 AM
- In sign
- ♓︎ Pisces
Cicadas claim the afternoon
South Dennis 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: 02660
15-Day Forecast — South Dennis
- Sun79°67°77%
- Mon76°64°67%
- Tue67°62°81%
- Wed67°61°22%
- Thu70°63°6%
- Fri78°69°20%
- Sat76°69°15%
- Sun73°68°16%
- Mon75°63°18%
- Tue75°64°19%
- Wed73°67°16%
- Thu75°69°23%
- Fri78°74°19%
- Sat78°71°40%
- Sun78°72°24%
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 — South Dennis
SPC includes South Dennis 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 South Dennis
- 02660