Weather in Cos Cob, CT
Cos Cob, Sunday, 9 August, 00:01
Clear. Feels like 79°. High 91°, low 73°.
Monthly outlook for Cos Cob, CT: average high 81.3°, average low 66.9°. That is 0.3° above the climate normal for August. Precipitation is expected on 6 days (about 1.5 inches), against a normal of 6 days and 2.2 inches. The warmest day looks like 9 August (90.7°), the coolest 22 August (60°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 82.4° | 81.5° | +0.5° |
| 19 August – 28 August | 79.3° | 79.8° | -0.3° |
| 29 August – 7 September | at normal | 78.2° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Byram (5 mi).
0.05
Cos Cob, Monday, 10 August
Light rain. High 90°, low 72°.
0
Cos Cob, Tuesday, 11 August
Overcast. High 89°, low 74°.
0.2Cos Cob, Wednesday, 12 August
Rain. High 78°, low 69°.
0.1Cos Cob, Thursday, 13 August
Light rain. High 83°, low 67°.
0
Cos Cob, Friday, 14 August
Clear. High 78°, low 61°.
0Cos Cob, Saturday, 15 August
Clear. High 80°, low 62°.
0Cos Cob, Sunday, 16 August
Overcast. High 80°, low 61°.
0.08Cos Cob, Monday, 17 August
Light rain. High 81°, low 67°.
0.13Cos Cob, Tuesday, 18 August
Light rain. High 76°, low 68°.
0.01Cos Cob, Wednesday, 19 August
Light rain. High 77°, low 70°.
0.88Cos Cob, Thursday, 20 August
Heavy rain. High 81°, low 66°.
0Cos Cob, Friday, 21 August
Overcast. High 77°, low 64°.
0Cos Cob, Saturday, 22 August
Clear. High 78°, low 60°.
0Cos Cob, Sunday, 23 August
Overcast. High 78°, low 64°.
0.02Cos Cob, Monday, 24 August
Light rain. High 84°, low 72°.
0.08
Cos Cob, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.06Cos Cob, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.16
Cos Cob, Thursday, 27 August
Climate normal for this date — 60-year average.
0.21Cos Cob, Friday, 28 August
Climate normal for this date — 60-year average.
0.14Cos Cob, Saturday, 29 August
Climate normal for this date — 60-year average.
0.08Cos Cob, Sunday, 30 August
Climate normal for this date — 60-year average.
0.05
Cos Cob, Monday, 31 August
Climate normal for this date — 60-year average.
0.09Cos Cob, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.18Cos Cob, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Cos Cob, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Cos Cob, Friday, 4 September
Climate normal for this date — 60-year average.
0.06Cos Cob, Saturday, 5 September
Climate normal for this date — 60-year average.
0.2Cos Cob, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Cos Cob, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Cos Cob, CT are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Cos Cob, CT since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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