As of 07:13 EDT

Weather in Belmont, MA

72°

Belmont, Sunday, 9 August, 07:13

Partly cloudy. Feels like 73°. High 93°, low 70°.

Pressure29.88 inHg

Wind2 mph W

Humidity85%

Visibility6.2 mi

Dew point68°

See detailed hourly forecast

Monthly outlook for Belmont, MA: average high 85.3°, average low 64.2°. That is 3.2° above the climate normal for August. Precipitation is expected on 2 days (about 0.1 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 22 August (93°), the coolest 15 August (55.2°).

85.3°/64.2°

Average high / low

+3.2°

Above normal

2 / 5

Wet days / normal

0.1 in

Precipitation this month

Ten-day blocks vs climate normal

Period	Forecast high	Normal	Difference
9 August – 18 August	84.3°	80.2°	+2.2°
19 August – 28 August	86.9°	78.3°	+4.8°
29 August – 7 September	at normal	76.4°	—

August records over 66 years

100°2 August 1975All-time high

46.2°31 August 1965All-time low

Mon, 1091° / 70°

91 °

Belmont, Monday, 10 August

Clear. High 91°, low 70°.

Pressure29.94 inHg

Wind5.2 mph SW

Humidity32%

Visibility6.2 mi

Dew point56°

Tue, 1190° / 68°

90 °

Belmont, Tuesday, 11 August

Light rain. High 90°, low 68°.

Pressure29.74 inHg

Wind8.7 mph NW

Humidity38%

Visibility6.2 mi

Dew point58°

Wed, 1284° / 66°

84 °

Belmont, Wednesday, 12 August

Overcast. High 84°, low 66°.

Pressure29.74 inHg

Wind0.8 mph SE

Humidity30%

Visibility6.2 mi

Dew point52°

Thu, 1382° / 64°

0.02

82 °

Belmont, Thursday, 13 August

Light rain. High 82°, low 64°.

Pressure29.65 inHg

Wind12.8 mph W

Humidity57%

Visibility—

Dew point58°

Fri, 1476° / 57°

76 °

Belmont, Friday, 14 August

Clear. High 76°, low 57°.

Pressure29.85 inHg

Wind15.1 mph NW

Humidity37%

Visibility—

Dew point42°

Sat, 1578° / 55°

78 °

Belmont, Saturday, 15 August

Clear. High 78°, low 55°.

Pressure29.91 inHg

Wind14.7 mph NW

Humidity36%

Visibility—

Dew point42°

Sun, 1681° / 59°

81 °

Belmont, Sunday, 16 August

Overcast. High 81°, low 59°.

Pressure30.06 inHg

Wind7 mph S

Humidity31%

Visibility—

Dew point42°

Mon, 1784° / 62°

0.05

84 °

Belmont, Monday, 17 August

Light rain. High 84°, low 62°.

Pressure30.00 inHg

Wind8.9 mph SW

Humidity33%

Visibility—

Dew point46°

Tue, 1884° / 59°

84 °

Belmont, Tuesday, 18 August

Light rain. High 84°, low 59°.

Pressure30.00 inHg

Wind10.4 mph SE

Humidity41%

Visibility—

Dew point50°

Wed, 1980° / 61°

80 °

Belmont, Wednesday, 19 August

Overcast. High 80°, low 61°.

Pressure30.15 inHg

Wind8.2 mph SE

Humidity44%

Visibility—

Dew point53°

Thu, 2089° / 64°

89 °

Belmont, Thursday, 20 August

Overcast. High 89°, low 64°.

Pressure30.06 inHg

Wind10.8 mph S

Humidity36%

Visibility—

Dew point52°

Fri, 2192° / 69°

0.04

92 °

Belmont, Friday, 21 August

Light rain. High 92°, low 69°.

Pressure29.88 inHg

Wind12.1 mph SW

Humidity47%

Visibility—

Dew point61°

Sat, 2293° / 71°

0.01

93 °

Belmont, Saturday, 22 August

Light rain. High 93°, low 71°.

Pressure29.85 inHg

Wind9.9 mph E

Humidity50%

Visibility—

Dew point65°

Sun, 2390° / 68°

90 °

Belmont, Sunday, 23 August

Clear. High 90°, low 68°.

Pressure29.94 inHg

Wind7.5 mph E

Humidity38%

Visibility—

Dew point54°

Mon, 2477° / 64°

0.01

77 °

Belmont, Monday, 24 August

Light rain. High 77°, low 64°.

Pressure30.06 inHg

Wind11.5 mph NE

Humidity65%

Visibility—

Dew point60°

From day 17 onward the outlook is built from 60-year climate statistics

Tue, 2578° / 62°

0.11

78 °

Belmont, Tuesday, 25 August

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.11 in

Chance of precipitation25%

Record high94° (2007)

Record low52° (1971)

Wed, 2680° / 62°

0.06

80 °

Belmont, Wednesday, 26 August

Climate normal for this date — 60-year average.

Average high80°

Average low62°

Average precipitation0.06 in

Chance of precipitation17%

Record high94° (2021)

Record low51° (1981)

Thu, 2779° / 63°

0.09

79 °

Belmont, Thursday, 27 August

Climate normal for this date — 60-year average.

Average high79°

Average low63°

Average precipitation0.09 in

Chance of precipitation35%

Record high96° (1993)

Record low52° (1989)

Fri, 2878° / 63°

0.12

78 °

Belmont, Friday, 28 August

Climate normal for this date — 60-year average.

Average high78°

Average low63°

Average precipitation0.12 in

Chance of precipitation30%

Record high94° (1993)

Record low53° (1986)

Sat, 2977° / 63°

0.17

77 °

Belmont, Saturday, 29 August

Climate normal for this date — 60-year average.

Average high77°

Average low63°

Average precipitation0.17 in

Chance of precipitation30%

Record high94° (2018)

Record low48° (1986)

Sun, 3078° / 62°

0.13

78 °

Belmont, Sunday, 30 August

Climate normal for this date — 60-year average.

Average high78°

Average low62°

Average precipitation0.13 in

Chance of precipitation25%

Record high92° (1973)

Record low48° (1965)

Mon, 3178° / 61°

0.08

78 °

Belmont, Monday, 31 August

Climate normal for this date — 60-year average.

Average high78°

Average low61°

Average precipitation0.08 in

Chance of precipitation25%

Record high92° (1973)

Record low46° (1965)

Tue, 0176° / 61°

0.06

76 °

Belmont, Tuesday, 1 September

Climate normal for this date — 60-year average.

Average high76°

Average low61°

Average precipitation0.06 in

Chance of precipitation23%

Record high93° (2010)

Record low50° (1975)

Wed, 0276° / 60°

0.15

76 °

Belmont, Wednesday, 2 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.15 in

Chance of precipitation25%

Record high94° (2010)

Record low48° (2017)

Thu, 0376° / 60°

0.12

76 °

Belmont, Thursday, 3 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.12 in

Chance of precipitation32%

Record high93° (2018)

Record low50° (1967)

Fri, 0476° / 60°

0.11

76 °

Belmont, Friday, 4 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.11 in

Chance of precipitation23%

Record high90° (1973)

Record low50° (1987)

Sat, 0576° / 60°

0.07

76 °

Belmont, Saturday, 5 September

Climate normal for this date — 60-year average.

Average high76°

Average low60°

Average precipitation0.07 in

Chance of precipitation17%

Record high93° (2018)

Record low50° (1994)

Sun, 0675° / 60°

0.15

75 °

Belmont, Sunday, 6 September

Climate normal for this date — 60-year average.

Average high75°

Average low60°

Average precipitation0.15 in

Chance of precipitation32%

Record high94° (2018)

Record low50° (2000)

Mon, 0776° / 59°

0.11

76 °

Belmont, Monday, 7 September

Climate normal for this date — 60-year average.

Average high76°

Average low59°

Average precipitation0.11 in

Chance of precipitation25%

Record high93° (2023)

Record low47° (1962)

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 Belmont, MA 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 Belmont, MA 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.