Current Conditions

Chelmsford, Massachusetts

48°F9°C

Clear

Feels like44°F7°C

Wind

NNE 8 mph13 km/h

Humidity

86%

Cloud Cover

73%

As of Wednesday, September 23, 2026 at 6:16 AM EDT

Today's Outlook

Day

Partly cloudy and mild, with a high of 64°F18°C and morning low of 52°F11°C. Breezy from the NE at 11 to 12 mph17 to 20 km/h. Dry air.

Night

Partly cloudy, with a low around 48°F9°C. Breezy from the NE at 7 to 8 mph11 to 13 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Clear	High 64°F18°C	Low 48°F9°CFeels 44°F7°C	Precip 0 in0 mm—	Cloud 38%	Wind NE 9 mph14 km/h	Wednesday: Partly cloudy and mild, with a high of 64°F18°C and morning low of 52°F11°C. Breezy from the NE at 11 to 12 mph17 to 20 km/h. Dry air. Wednesday Night: Partly cloudy, with a low around 48°F9°C. Breezy from the NE at 7 to 8 mph11 to 13 km/h.
Clear	High 65°F19°C	Low 45°F7°CFeels 41°F5°C	Precip 0 in0 mm—	Cloud 38%	Wind NE 8 mph13 km/h	Thursday: Partly cloudy and mild, with a high of 65°F19°C and morning low of 49°F10°C. Breezy from the NE at 9 to 10 mph15 to 17 km/h. Dry air. Thursday Night: Partly cloudy, with a low around 45°F7°C. Breezy from the NNE at 7 to 8 mph11 to 12 km/h.
Light Rain	High 65°F18°C	Low 49°F9°CFeels 45°F7°C	Precip 0.11 in2.8 mm43%	Cloud 92%	Wind NNE 11 mph18 km/h	Friday: Overcast and mild, with a high of 65°F18°C and morning low of 53°F12°C. Breezy from the NE at 12 to 13 mph19 to 21 km/h. 28% chance of light rain throughout the day. Dry air. Friday Night: Overcast, with a low around 49°F9°C. Breezy from the NNE at 10 to 12 mph16 to 19 km/h. 43% chance of light rain in the evening.
Rain	High 59°F15°C	Low 57°F14°C	Precip 0.76 in19.4 mm88%	Cloud 97%	Wind NNE 14 mph23 km/h	Saturday: Overcast and mild, with a high of 59°F15°C. Breezy from the NNE at 15 mph23 km/h. 86% chance of rain throughout the day. Saturday Night: Overcast, with a low around 57°F14°C. Breezy from the NNE at 14 to 16 mph23 to 25 km/h. 88% chance of rain throughout the night.
Rain	High 59°F15°C	Low 57°F14°C	Precip 1.12 in28.4 mm97%	Cloud 99%	Wind NE 13 mph21 km/h	Sunday: Overcast and mild, with a high of 59°F15°C. Breezy from the NE at 13 to 14 mph22 to 23 km/h. 97% chance of rain throughout the day. Sunday Night: Overcast, with a low around 57°F14°C. Breezy from the NE at 13 to 16 mph21 to 25 km/h. 94% chance of rain throughout the night.
Light Rain	High 61°F16°C	Low 57°F14°C	Precip 0.34 in8.6 mm83%	Cloud 95%	Wind N 7 mph12 km/h	Monday: Overcast and mild, with a high of 61°F16°C. Breezy from the N at 7 to 8 mph12 to 13 km/h. 67% chance of light rain throughout the day. Monday Night: Overcast, with a low around 57°F14°C. Breezy from the NNE at 7 to 9 mph12 to 15 km/h. 83% chance of light rain throughout the night.
Drizzle	High 67°F20°C	Low 57°F14°C	Precip 0.03 in0.7 mm15%	Cloud 76%	Wind NW 5 mph8 km/h	Tuesday: Overcast and mild, with a high of 67°F20°C and morning low of 58°F15°C. Light wind from the NW around 5 mph8 km/h. Tuesday Night: Mostly cloudy, with a low around 57°F14°C. Light wind from the WNW around 5 mph8 km/h. 15% chance of drizzle overnight.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	WednesdaySep 23	64°F18°C	48°F9°C Feels 44°F7°C	0 in0 mm· —	38%	Clear	NE 9 mph14 km/h
DayPartly cloudy and mild, with a high of 64°F18°C and morning low of 52°F11°C. Breezy from the NE at 11 to 12 mph17 to 20 km/h. Dry air. NightPartly cloudy, with a low around 48°F9°C. Breezy from the NE at 7 to 8 mph11 to 13 km/h.
	ThursdaySep 24	65°F19°C	45°F7°C Feels 41°F5°C	0 in0 mm· —	38%	Clear	NE 8 mph13 km/h
DayPartly cloudy and mild, with a high of 65°F19°C and morning low of 49°F10°C. Breezy from the NE at 9 to 10 mph15 to 17 km/h. Dry air. NightPartly cloudy, with a low around 45°F7°C. Breezy from the NNE at 7 to 8 mph11 to 12 km/h.
	FridaySep 25	65°F18°C	49°F9°C Feels 45°F7°C	0.11 in2.8 mm· 43%	92%	Light Rain	NNE 11 mph18 km/h
DayOvercast and mild, with a high of 65°F18°C and morning low of 53°F12°C. Breezy from the NE at 12 to 13 mph19 to 21 km/h. 28% chance of light rain throughout the day. Dry air. NightOvercast, with a low around 49°F9°C. Breezy from the NNE at 10 to 12 mph16 to 19 km/h. 43% chance of light rain in the evening.
	SaturdaySep 26	59°F15°C	57°F14°C	0.76 in19.4 mm· 88%	97%	Rain	NNE 14 mph23 km/h
DayOvercast and mild, with a high of 59°F15°C. Breezy from the NNE at 15 mph23 km/h. 86% chance of rain throughout the day. NightOvercast, with a low around 57°F14°C. Breezy from the NNE at 14 to 16 mph23 to 25 km/h. 88% chance of rain throughout the night.
	SundaySep 27	59°F15°C	57°F14°C	1.12 in28.4 mm· 97%	99%	Rain	NE 13 mph21 km/h
DayOvercast and mild, with a high of 59°F15°C. Breezy from the NE at 13 to 14 mph22 to 23 km/h. 97% chance of rain throughout the day. NightOvercast, with a low around 57°F14°C. Breezy from the NE at 13 to 16 mph21 to 25 km/h. 94% chance of rain throughout the night.
	MondaySep 28	61°F16°C	57°F14°C	0.34 in8.6 mm· 83%	95%	Light Rain	N 7 mph12 km/h
DayOvercast and mild, with a high of 61°F16°C. Breezy from the N at 7 to 8 mph12 to 13 km/h. 67% chance of light rain throughout the day. NightOvercast, with a low around 57°F14°C. Breezy from the NNE at 7 to 9 mph12 to 15 km/h. 83% chance of light rain throughout the night.
	TuesdaySep 29	67°F20°C	57°F14°C	0.03 in0.7 mm· 15%	76%	Drizzle	NW 5 mph8 km/h
DayOvercast and mild, with a high of 67°F20°C and morning low of 58°F15°C. Light wind from the NW around 5 mph8 km/h. NightMostly cloudy, with a low around 57°F14°C. Light wind from the WNW around 5 mph8 km/h. 15% chance of drizzle overnight.
	WednesdaySep 30	72°F22°C	56°F13°C	0.01 in0.3 mm· 7%	65%	Partly Cloudy	SW 4 mph6 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 58°F14°C. Light wind from the WSW around 4 mph6 km/h. NightMostly cloudy, with a low around 56°F13°C. Light wind from the SW around 4 mph7 km/h.
	ThursdayOct 1	73°F23°C	58°F14°C	0.06 in1.4 mm· 13%	67%	Drizzle	SSW 6 mph10 km/h
DayMostly cloudy and warm, with a high of 73°F23°C and morning low of 59°F15°C. Breezy from the SSW at 6 to 7 mph10 to 11 km/h. 11% chance of drizzle throughout the day. NightMostly cloudy, with a low around 58°F14°C. Breezy from the SSW at 6 to 7 mph10 to 11 km/h. 13% chance of drizzle throughout the night.
	FridayOct 2	72°F22°C	60°F15°C	0.17 in4.3 mm· 19%	66%	Showers	WSW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 72°F22°C and morning low of 61°F16°C. Breezy from the WSW at 7 to 8 mph11 to 12 km/h. 19% chance of showers throughout the day. NightMostly cloudy, with a low around 60°F15°C. Breezy from the WSW at 7 mph11 km/h. 18% chance of showers throughout the night.
	SaturdayOct 3	69°F20°C	56°F14°C	0.18 in4.5 mm· 18%	59%	Showers	WNW 7 mph11 km/h
DayMostly cloudy and warm, with a high of 69°F20°C and morning low of 57°F14°C. Breezy from the WNW at 7 to 8 mph11 to 12 km/h. 17% chance of showers throughout the day. NightMostly cloudy, with a low around 56°F14°C. Breezy from the W at 7 mph11 km/h. 18% chance of showers throughout the night.
	SundayOct 4	68°F20°C	54°F12°C	0.14 in3.5 mm· 16%	64%	Showers	WSW 6 mph10 km/h
DayMostly cloudy and mild, with a high of 68°F20°C and morning low of 55°F13°C. Breezy from the SW at 6 to 7 mph10 to 11 km/h. 16% chance of showers throughout the day. NightMostly cloudy, with a low around 54°F12°C. Light wind from the WSW around 6 mph10 km/h. 16% chance of showers throughout the night.
	MondayOct 5	66°F19°C	55°F13°C	0.17 in4.2 mm· 24%	66%	Showers	W 7 mph11 km/h
DayMostly cloudy and mild, with a high of 66°F19°C and morning low of 55°F13°C. Breezy from the WNW at 7 mph11 km/h. 24% chance of showers throughout the day. NightMostly cloudy, with a low around 55°F13°C. Breezy from the W at 7 mph10 km/h. 21% chance of showers throughout the night.
	TuesdayOct 6	64°F18°C	53°F12°C	0.21 in5.4 mm· 26%	60%	Showers	WNW 7 mph11 km/h
DayMostly cloudy and mild, with a high of 64°F18°C and morning low of 54°F12°C. Breezy from the WNW at 7 to 8 mph12 to 12 km/h. 26% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 53°F12°C. Breezy from the WNW at 7 mph11 km/h. 20% chance of showers throughout the night.
	WednesdayOct 7	63°F17°C	50°F10°C	0.17 in4.4 mm· 22%	54%	Showers	WNW 7 mph12 km/h
DayMostly cloudy and mild, with a high of 63°F17°C and morning low of 51°F11°C. Breezy from the WNW at 8 to 9 mph13 to 14 km/h. 19% chance of showers throughout the day. Dry air. NightMostly cloudy, with a low around 50°F10°C. Breezy from the WNW at 7 mph11 km/h. 22% chance of showers throughout the night.

Nearby Cities

Lowell3 mi6 km Westford4 mi6 km Billerica6 mi9 km Dracut6 mi9 km Tewksbury7 mi11 km Acton9 mi14 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 42.5998°N, 71.3673°W·Elevation: 75m·Timezone: America/New_York·Population: 33,925