Fire Weather Planning Forecast for Southern New England
National Weather Service Boston/Norton MA
409 PM EDT Sat Apr 18 2026
.DISCUSSION...
Showers return Sunday with another cold front. It's possible
temperatures could drop low enough Sunday to support some snow
flurries in the higher elevation areas in western MA. Drier
Monday but a few showers will be around.
Minimum relative humidities Sunday will be between 60 and
80 percent and between 35 and 55 percent Monday.
.OUTLOOK...Tuesday through Thursday...
Below normal temperatures more typical of early to mid March
continue Tuesday, with blustery west winds, but dry weather
prevails into early next week. Some showers possible Wednesday
along with another cold front pushing through then drying out
with warmer temperatures on Thursday.
Southeast Middlesex MA-
Including the city of Cambridge
409 PM EDT Sat Apr 18 2026
Tonight Sun Sun Night Mon
Cloud Cover Mcldy Cloudy Pcldy Pcldy
Precip Type None Showers Showers Showers
Chance Precip (%) 10 100 40 20
Chance of Thunder (%) 0 0 0 0
Temp (24h trend) 45 (0) 56 (0) 35 51
RH % (24h trend) 93 (-7) 71 (+10) 79 33
20ft Wnd AM(mph) Lgt/Var Lgt/Var
20ft Wnd PM(mph) Lgt/Var NW 8 G20 NW 7 G19 W 6
Precip Amount 0.00 0.35 0.02 0.00
Precip Duration 8 0
Precip Begin 6 AM Continuing
Precip End Continuing 8 PM
Mixing Hgt (ft-AGL) 810 2350 310 8790
Transport Wnd (kts) S 7 NW 25 W 9 W 15
Vent Rate (kt-ft) 5670 58750 2790 131850
Max ADI Early 18 Gen Poor 16 Gen Poor 55 Gen Good 105 Very Good
Max ADI Late 4 Very Poor 58 Gen Good 8 Poor 105 Very Good
Max LVORI Early 6 4 3 2
Max LVORI Late 6 4 3 2
Min Vsby Early 1 Fog 0 Fog 9 9
Min Vsby Late 0 Fog 2 Fog 9 9
Sunshine Hours N/A N/A N/A N/A
CWR 0 100 90 10
Remarks...None.
.FORECAST FOR DAYS 3 THROUGH 7...
.MONDAY NIGHT...Partly cloudy. Lows in the lower 30s. North winds
around 5 mph.
.TUESDAY...Sunny. Highs in the lower 50s. North winds around
5 mph, becoming southeast in the afternoon.
.TUESDAY NIGHT AND WEDNESDAY...Mostly cloudy. Lows in the upper
30s. Highs in the mid 50s. Southwest winds around 5 mph.
.WEDNESDAY NIGHT THROUGH THURSDAY NIGHT...Partly cloudy. Lows in
the lower 40s. Highs in the lower 60s. Northwest winds around
5 mph.
.FRIDAY AND FRIDAY NIGHT...Partly cloudy. Lows in the lower 40s.
Highs in the lower 60s. North winds around 5 mph.
.SATURDAY...Partly sunny with a chance of showers. Highs around
60. North winds around 5 mph, becoming east in the afternoon.