As of 12:07 EDT

Weather in Northwest Harwinton, CT

83°Current weather

Northwest Harwinton, Sunday, 9 August, 12:07

Clear. Feels like 89°. High 83°, low 68°.

Pressure29.94 inHg
Wind4 mph N
Humidity73%
Visibility6.2 mi
Dew point72°

Monthly outlook for Northwest Harwinton, CT: average high 78.5°, average low 58.8°. That is 0.1° above the climate normal for August. Precipitation is expected on 4 days (about 0.9 inches), against a normal of 6 days and 2.5 inches. The warmest day looks like 23 August (84.2°), the coolest 15 August (51.9°).

78.5°/58.8°
Average high / low
+0.1°
Above normal
4 / 6
Wet days / normal
0.9 in
Precipitation this month

Ten-day blocks vs climate normal

PeriodForecast highNormalDifference
9 August – 18 August77.2°79.3°-1.1°
19 August – 28 August80.8°77.3°+1.9°
29 August – 7 Septemberat normal75.8°

August records over 66 years

97.2°2 August 1975All-time high
44.2°30 August 1986All-time low

Climate normals and records are computed from the nearest reference point — Plymouth (8 mi).

Mon, 1084° / 64°0Light rain
84 °Light rain

Northwest Harwinton, Monday, 10 August

Light rain. High 84°, low 64°.

Pressure29.97 inHg
Wind7.7 mph SW
Humidity42%
Visibility6.2 mi
Dew point59°
Tue, 1183° / 64°0Light rain
83 °Light rain

Northwest Harwinton, Tuesday, 11 August

Light rain. High 83°, low 64°.

Pressure29.85 inHg
Wind11 mph NW
Humidity47%
Visibility6.2 mi
Dew point59°
Wed, 1283° / 60°0Overcast
83 °Overcast

Northwest Harwinton, Wednesday, 12 August

Overcast. High 83°, low 60°.

Pressure29.83 inHg
Wind3 mph SW
Humidity41%
Visibility6.2 mi
Dew point56°
Thu, 1380° / 62°0.05Light rain
80 °Light rain

Northwest Harwinton, Thursday, 13 August

Light rain. High 80°, low 62°.

Pressure29.71 inHg
Wind13.5 mph NW
Humidity67%
Visibility6.2 mi
Dew point64°
Fri, 1473° / 53°0Clear
73 °Clear

Northwest Harwinton, Friday, 14 August

Clear. High 73°, low 53°.

Pressure29.97 inHg
Wind11.1 mph NW
Humidity48%
Visibility
Dew point46°
Sat, 1573° / 52°0Clear
73 °Clear

Northwest Harwinton, Saturday, 15 August

Clear. High 73°, low 52°.

Pressure30.12 inHg
Wind12.7 mph N
Humidity45%
Visibility
Dew point43°
Sun, 1673° / 52°0Partly cloudy
73 °Partly cloudy

Northwest Harwinton, Sunday, 16 August

Partly cloudy. High 73°, low 52°.

Pressure30.18 inHg
Wind7 mph W
Humidity38%
Visibility
Dew point43°
Mon, 1762° / 60°0.27Light rain
62 °Light rain

Northwest Harwinton, Monday, 17 August

Light rain. High 62°, low 60°.

Pressure30.00 inHg
Wind7.8 mph N
Humidity84%
Visibility
Dew point57°
Tue, 1879° / 57°0Clear
79 °Clear

Northwest Harwinton, Tuesday, 18 August

Clear. High 79°, low 57°.

Pressure29.94 inHg
Wind7.2 mph NW
Humidity51%
Visibility
Dew point52°
Wed, 1979° / 61°0Overcast
79 °Overcast

Northwest Harwinton, Wednesday, 19 August

Overcast. High 79°, low 61°.

Pressure29.91 inHg
Wind11.6 mph S
Humidity53%
Visibility
Dew point56°
Thu, 2084° / 61°0.06Light rain
84 °Light rain

Northwest Harwinton, Thursday, 20 August

Light rain. High 84°, low 61°.

Pressure29.68 inHg
Wind9.8 mph NW
Humidity72%
Visibility
Dew point65°
Fri, 2181° / 54°0Clear
81 °Clear

Northwest Harwinton, Friday, 21 August

Clear. High 81°, low 54°.

Pressure29.85 inHg
Wind8.3 mph W
Humidity58%
Visibility
Dew point56°
Sat, 2283° / 58°0Clear
83 °Clear

Northwest Harwinton, Saturday, 22 August

Clear. High 83°, low 58°.

Pressure29.97 inHg
Wind9.7 mph SW
Humidity39%
Visibility
Dew point48°
Sun, 2384° / 61°0.46Rain
84 °Rain

Northwest Harwinton, Sunday, 23 August

Rain. High 84°, low 61°.

Pressure29.77 inHg
Wind15.5 mph W
Humidity77%
Visibility
Dew point68°
Mon, 2473° / 53°0Clear
73 °Clear

Northwest Harwinton, Monday, 24 August

Clear. High 73°, low 53°.

Pressure30.18 inHg
Wind8.2 mph NW
Humidity50%
Visibility
Dew point47°
From day 17 onward the outlook is built from 60-year climate statistics
Tue, 2578° / 60°0.12Climate normal
78 °Climate normal

Northwest Harwinton, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high78°
Average low60°
Average precipitation0.12 in
Chance of precipitation28%
Record high90° (2020)
Record low48° (1971)
Wed, 2678° / 60°0.09Climate normal
78 °Climate normal

Northwest Harwinton, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high78°
Average low60°
Average precipitation0.09 in
Chance of precipitation28%
Record high90° (2021)
Record low49° (1963)
Thu, 2778° / 62°0.18Climate normal
78 °Climate normal

Northwest Harwinton, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high78°
Average low62°
Average precipitation0.18 in
Chance of precipitation38%
Record high91° (1993)
Record low50° (1989)
Fri, 2878° / 62°0.21Climate normal
78 °Climate normal

Northwest Harwinton, Friday, 28 August

Climate normal for this date — 60-year average.

Average high78°
Average low62°
Average precipitation0.21 in
Chance of precipitation37%
Record high91° (2018)
Record low51° (1968)
Sat, 2977° / 61°0.17Climate normal
77 °Climate normal

Northwest Harwinton, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high77°
Average low61°
Average precipitation0.17 in
Chance of precipitation37%
Record high91° (2018)
Record low45° (1982)
Sun, 3077° / 60°0.09Climate normal
77 °Climate normal

Northwest Harwinton, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high77°
Average low60°
Average precipitation0.09 in
Chance of precipitation23%
Record high91° (1973)
Record low44° (1986)
Mon, 3177° / 60°0.07Climate normal
77 °Climate normal

Northwest Harwinton, Monday, 31 August

Climate normal for this date — 60-year average.

Average high77°
Average low60°
Average precipitation0.07 in
Chance of precipitation23%
Record high92° (1973)
Record low46° (1965)
Tue, 0176° / 60°0.13Climate normal
76 °Climate normal

Northwest Harwinton, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high76°
Average low60°
Average precipitation0.13 in
Chance of precipitation27%
Record high92° (2010)
Record low48° (1975)
Wed, 0276° / 59°0.16Climate normal
76 °Climate normal

Northwest Harwinton, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high76°
Average low59°
Average precipitation0.16 in
Chance of precipitation30%
Record high93° (2010)
Record low47° (1991)
Thu, 0375° / 59°0.12Climate normal
75 °Climate normal

Northwest Harwinton, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high75°
Average low59°
Average precipitation0.12 in
Chance of precipitation38%
Record high90° (2018)
Record low46° (1967)
Fri, 0476° / 60°0.11Climate normal
76 °Climate normal

Northwest Harwinton, Friday, 4 September

Climate normal for this date — 60-year average.

Average high76°
Average low60°
Average precipitation0.11 in
Chance of precipitation25%
Record high91° (1973)
Record low48° (1987)
Sat, 0575° / 59°0.07Climate normal
75 °Climate normal

Northwest Harwinton, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high75°
Average low59°
Average precipitation0.07 in
Chance of precipitation27%
Record high91° (2018)
Record low47° (1989)
Sun, 0675° / 59°0.22Climate normal
75 °Climate normal

Northwest Harwinton, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high75°
Average low59°
Average precipitation0.22 in
Chance of precipitation32%
Record high93° (2018)
Record low46° (1989)
Mon, 0775° / 58°0.13Climate normal
75 °Climate normal

Northwest Harwinton, Monday, 7 September

Climate normal for this date — 60-year average.

Average high75°
Average low58°
Average precipitation0.13 in
Chance of precipitation32%
Record high93° (2023)
Record low44° (1984)

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 Northwest Harwinton, 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 Northwest Harwinton, 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.