Weather StoryAlmanac, microseasons, and the day's weather story.

Weather in Cos Cob, Connecticut

Roses open along the stoops. Day 59 of spring. Read this microseason across nine climate regions →

Cos Cob, CT
Sunday, May 17 at 2:42 AM
64
°
Clear
Feels like
61°
Humidity
60%
Wind
6 mph
Sunrise
5:35 AM
Sunset
8:06 PM
Cos Cob, CT
Hour by hour · 24h
54°
10p
53°
11p
51°
12a
50°
1a
49°
2a
49°
3a
48°
4a
49°
5a
48°
6a
52°
7a
55°
8a
56°
9a
59°
10a
62°
11a
64°
12p
64°
1p
65°
2p
66°
3p
66°
4p
66°
5p
66°
6p
65°
7p
62°
8p
59°
9p
L 48°H 66°
Cos Cob, CT
7-day forecast
  1. Today
    May 16
    Mostly Clear
    —
    78°48°
  2. Sunday
    May 17
    Overcast
    —
    90°61°
  3. Monday
    May 18
    Light Drizzle
    —
    76°60°
  4. Tuesday
    May 19
    Overcast
    16%
    93°62°
  5. Wednesday
    May 20
    Light Showers
    74%
    93°60°
  6. Thursday
    May 21
    Overcast
    38%
    71°51°
  7. Friday
    May 22
    Light Drizzle
    18%
    62°48°
Cos Cob, CT
Next 24 hours · Cool now
44°57°70°12a6a12p6pnow 54°high 66°low 48°
Cos Cob, CT
Anemometer · 24h winds · from true
NESW
From · True
SSW
212° · backing 40°
Direction
SSW
212°
Sustained
6
mph
Gust
11
mph
Peak 24h
25
avg 7
Beaufort · 2 · LIGHT BRZ
0
CALM
<1
1
LIGHT AIR
1–3
2
LIGHT BRZ
4–7
3
GENTLE BRZ
8–12
4
MOD BRZ
13–18
5
FRESH BRZ
19–24
6
STRONG BRZ
25–31
7
NEAR GALE
32–38
24h · sust vs gust · mph
avg 7 · pk 25 @ 3:00p
−24h−18h−12h−6hnow
Light breeze backing 40° from the ssw.
Cos Cob, CT
Barometer · 24h pressure · mb
STORMRAINCHANGEFAIRDRY9901000101010201030
Pressure · mb
1008.3
-0.2 mb in 3h · rising · 29.78 inHg
Now
1008.3
mb
3h
-0.2
mb
12h
-3.3
mb
24h
-4.7
mb
Regime · RAIN
STORM
RAIN
CHANGE
FAIR
DRY
24h · Pressure · mb
range 1008–1015
−24h−18h−12h−6hnow
Damp, unsettled regime — wet weather lingers nearby.
Cos Cob, CT
Air quality
82
AQI
Moderate
PM 2.5
12.9 μg/m³
PM 10
15.1 μg/m³
NO₂
23.9 μg/m³
Ozone
89.0 μg/m³
UV Index
0.0 Low
Cos Cob, CT
Almanac · Sunday, May 17
When the dew is on the grass, rain will never come to pass.
Civil dawn
9:05 AM
Sunrise
5:35 AM
Daylight
14h 31m
Sunset
8:06 PM
Civil dusk
12:38 AM
Planting note
Direct sow okra, melons, and southern peas. Thin carrot rows.
Cos Cob, CT
The moon
New Moon
0% illuminated
Moonrise
9:38 AM
Moonset
12:34 AM
In sign
♊︎ Gemini
Cos Cob, CT
Microseason · 28 of 72
May 16–20

Roses open along the stoops

plant
Jan 137% of the yearDec 31

Read this microseason across nine climate regions →

Cos Cob at a glance

  • Today vs. normal: 7°F below the seasonal normal for this latitude
  • Last frost: April 22 (climatological average for this latitude)
  • Microseason: 28 of 72, May 16–20
  • Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.

Right now in the garden

Warm-season window is open

As of May 17, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.

All cities in Connecticut →

ZIP codes in Cos Cob

Climate normals from the Open-Meteo Climate API. Köppen approximation from NOAA NCEI U.S. Climate Regions. See methodology for data sources, editorial rules, and corrections. Maintainer: Brian Tighe.