Today | Weather | Friday, October 30, 2026

Active Weather Warnings

Special Weather Statement

Weather in Waltham, Massachusetts

06:21 AM

Now

54° F

Feels Like 48°

Precipitation 42 %

Wind 8 mph

Humidity 90 %

Today

Day 72°

Night 39°

Precipitation 0 %

Wind 17 mph

UV Index (0 - 11+) 3

Waltham Weather Forecast Updated

22 minutes ago

Last updated on October 30, 2026 at 5:58 AM

Weather Forecast History

Last Year's Weather on This Day (October 30, 2025)

Day

57°

Night

54°

Wind

14 mph

UV Index

Precipitation

92 %

Air Quality in Waltham

NOW

36 AQI

Good air quality Dominant pollutant: PM_2.5

Pollutant Concentrations:

PM_2.5 8.74 µg/m³

PM₁₀ 17.02 µg/m³

O₃ 0.032 ppm

NO₂ 5.4 ppb

SO₂ 1 ppb

CO 0.17 ppm

NH₃ 0.13 µg/m³

NO 0 µg/m³

PM_2.5 – Fine particles <2.5μm

PM₁₀ – Inhalable particles <10μm

O₃ – Ozone

NO₂ – Nitrogen dioxide

SO₂ – Sulfur dioxide

CO – Carbon monoxide

NH₃ – Ammonia

NO – Nitric oxide

Health Recommendations:

Air quality is considered satisfactory, and air pollution poses little or no risk.

Show raw pollutant concentrations (µg/m³)

PM_2.5 – 8.74 µg/m³

PM₁₀ – 17.02 µg/m³

O₃ – 62.75 µg/m³

NO₂ – 10.16 µg/m³

SO₂ – 2.59 µg/m³

CO – 193.28 µg/m³

NH₃ – 0.13 µg/m³

NO – 0 µg/m³

View Hourly Air Quality Forecast

Weather Alerts and Warnings for Waltham

Moderate Expected Observed

Special Weather Statement

Special Weather Statement issued October 29 at 2:47PM EDT by NWS Boston/Norton MA

Oct 29, 2:47 PM → Oct 30, 6:15 PM

The combination of dry fuels, gusty northwest winds up to 25 to 35
mph, and minimum relative humidity values near 40 percent will
contribute to an elevated risk of fire spread across southern New
England. The lowest relative humidity and strongest wind gusts
are expected during the late morning to mid afternoon hours on
Friday.

Use extra caution if handling any potential ignition sources such
as machinery or matches, and ensure to properly extinguish or
dispose of cigarette butts.

Updated: Oct 30, 5:58 AM Source: NWS Alert