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Wednesday, September 9, 2026

September 9, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, SEPTEMBER 9, 2026 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

WEDNESDAY, SEPTEMBER 9, 2026
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0518E
SUNSET:  1804E

MAINLY CLOUDY TODAY WITH INCREASING HUMIDITY LEVELS….

As a warm front approaches the region, clouds of mainly the mid
and high level varieties have been dominating the sky today. Some
filtered sun has been getting through at times which has allowed
temperatures to warm nonetheless. The biggest difference today is
the return of higher humidity levels which is making it feel a
bit muggy out there this afternoon.

Temperatures started the day near normal levels in the upper 50s,
but have warmed markedly into the upper 70s by early this
afternoon despite the widespread cloud clover. As mentioned, the
humidity has been on the increase as well with the dew point
rising from the mid 50s early this morning to the mid to upper
60s by early this afternoon.

Winds were quite light and variable during the morning hours,
but has since settled out of the south to south-southwest early
this afternoon. The speed has increased quite a bit early this
afternoon as well. The average speed for the day so far is around
7mph, but again the trend is upward. The peak gust so far for the
day is 26mph, which occurred during the 1pm observation period.

Visibility has been somewhat limited today due to increased
haziness. The view has been around 30-35 miles throughout the
day so far.

The maximum temperature so far today is 78F, which is 3 degrees
above the normal high of 75F. The minimum temperature since
midnight is 58F, which is equal to the normal low.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken altocumulus castellanus, broken altocumulus,
overcast cirrus, few thin spots in overcast SE-SW, stratus layer
distant E-S
Temperature: 62F; Dew Point: 57F; Relative Humidity: 86%
Wind: NE @ 4 kts, wind light
Sea-level pressure: 1026.0 mb; 30.30 in. Hg: steady, then rising
Visibility: 30 miles, hazy
6-hr Max temp: 63F
6-hr Min temp: 58F
24-hr Precip: 0.00 inches
BHO SA 1155 E55 BKN 150 BKN 250 OVC 30 260/62/57/0404/030/
FEW THN SPTS IOVC SE-SW ST LYR DSNT E-S HAZY WND LGT/ 8/681
53009 10063 20058

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus, few breaks in
overcast all quadrants, few stratocumulus distant E-S
Temperature: 69F; Dew Point: 62F; Relative Humidity: 79%
Wind: S @ 3 kts, wind light and variable
Sea-level pressure: 1024.7 mb; 30.26 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E130 BKN 180 OVC 30 247/69/62/1803/026/ FEW BINOVC ALQDS
FEW SC DSNT E-S HIER CLDS VSBL ALQDS HAZY WND L/V/ 8/657 58013

1 P.M.
Weather: Broken altocumulus, overcast cirrostratus, few breaks
in overcast distant SE-S, few cumulus all quadrants
Temperature: 77F; Dew Point: 60F; Relative Humidity: 55%
Wind: SSW @ 12G23 kts
Sea-level pressure: 1022.0 mb; 30.18 in. Hg: falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 78F
6-hr Min temp: 62F
6-hr Precip: 0.00 inches
BHO SA 1755 E150 BKN 220 OVC 35 220/77/60/2012G23/018/
FEW BINOVC DSNT SE-S FEW CU ALQDS HIER CLDS VSBL DSNT SE-S HAZY/
8/257 58027 10078 20062

————————————————————–

SUMMARY FOR TUESDAY, SEPTEMBER 8, 2026

TEMPERATURE (DEGREES F)
MAX…….80   NORMAL…..76
MIN…….58   NORMAL…..58
MEAN……69   NORMAL…..67

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+2
TOTAL DEPARTURE FOR THE MONTH (SEP)…………………-11 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2026 THRU JUN 2027)
TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH (SEP)………..6  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON…………….9  DEPARTURE…….-19
TOTAL HEATING UNITS LAST SEASON TO DATE……….32  DEPARTURE…….-23

COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026)
TOTAL COOLING UNITS FOR YESTERDAY……………..4  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH (SEP)……….19  DEPARTURE…….-14
TOTAL COOLING UNITS FOR THE SEASON…………..773  DEPARTURE……+144
TOTAL COOLING UNITS LAST SEASON TO DATE………699  DEPARTURE…….+74

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated *=Last of multiple occurrences

F420C (Official)………..23 WNW  @   06:08 A.M.
VECTOR #1 (1-Sec)……….22 NNW  @   10:03 A.M.
VECTOR #2 (1-Sec)……….24 NW   @   10:47 A.M.
DAVIS #1……………….22 WNW  @   01:27 P.M.
DAVIS #2 ………………20 NW   @   09:48 A.M.
RMY #1 (Instantaneous)…..24 NW   @   01:26 P.M.
RMY #2 (Instantaneous)…..24 NW   @   09:48 A.M.
MERLIN…………………22 NW
RICHARDS (C5C) (Inst)……22 NW   @   10:47 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 WNW  @   05:22 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 NNW  @   10:31 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 NW   @   01:27 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 NW   @   10:49 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 NW   @   01:27 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 NNW  @   10:36 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 NW   @   01:27 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 NNW  @   10:49 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..8.0 WNW [193 total miles] VECTOR #1………………8.4
VECTOR #2………………8.8
DAVIS #1……………….8.3 WNW
DAVIS #2…………………M
RMY #1…………………8.3 WNW
RMY #2…………………8.6 WNW
RICHARDS (C5C)………….8.7

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH (SEP)……..1.01 DEPARTURE…..+0.07
TOTAL PRECIPITATION FOR THE YEAR (2026)…….27.00 DEPARTURE…..-8.55

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

9/1  69/57/63/-6/0.21/…/..             15 SSW VEC1 15 E   RMY 14
9/2  76/58/67/-2/0.00/…/..             21 ESE VEC1 21 ESE RMY 20
9/3  74/60/67/-1/0.45/…/..             24 SSE VEC1 24 SSE RMY 23
9/4  84/63/74/+6/0.00/…/..             24 NNW VEC1 25 NNW RMY 24
9/5  71/60/66/-2/T/…/..                24 ENE VEC1 24 ENE RMY 25
9/6  69/53/61/-7/0.35/…/..             24 NE  VEC1 24 NNE RMY 27
9/7  79/52/66/-1/0.00/…/..             30 NW  VEC1 30 NW  RMY 30
9/8  80/58/69/+2/0.00/…/..             23 WNW VEC1 22 NNW RMY 24

9/9 The low since midnight is 58F, the daily normal low is 58F.

————————————————————–

SEPTEMBER DAILY RECORDS TO DATE

NONE.

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978

RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972

TODAY’S REPORT PREPARED BY: Matt Douglas

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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