Hourly Weather | Today Wednesday, March 18, 2026
Modesto, California
1 PM
Sunny Weather
81°
Feels Like 90°
0
Humidity: 51%
UV Index: 5
Wind: 4 mph
2 PM
Cloudy Weather
84°
Feels Like 91°
0
Humidity: 46%
UV Index: 5
Wind: 4 mph
3 PM
Cloudy Weather
86°
Feels Like 91°
0
Humidity: 42%
UV Index: 4
Wind: 5 mph
4 PM
Cloudy Weather
90°
Feels Like 91°
0
Humidity: 39%
UV Index: 3
Wind: 6 mph
5 PM
Cloudy Weather
88°
Feels Like 88°
0
Humidity: 40%
UV Index: 2
Wind: 7 mph
6 PM
Cloudy Weather
84°
Feels Like 84°
0
Humidity: 43%
UV Index: 1
Wind: 7 mph
7 PM
Cloudy Weather
82°
Feels Like 81°
0
Humidity: 46%
UV Index: 0
Wind: 6 mph
8 PM
Night
81°
Feels Like 79°
0
Humidity: 51%
UV Index: 0
Wind: 6 mph
9 PM
Night
77°
Feels Like 75°
0
Humidity: 59%
UV Index: 0
Wind: 6 mph
10 PM
Night
73°
Feels Like 73°
0
Humidity: 67%
UV Index: 0
Wind: 6 mph
11 PM
Night
72°
Feels Like 70°
0
Humidity: 76%
UV Index: 0
Wind: 6 mph

Hourly Air Quality Forecast - AQI (US EPA)

1 PM
86 AQI
Moderate air quality Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 26.57 µg/m³
  • PM10: 30.53 µg/m³
  • O3: 0.066 ppm
  • NO2: 1.4 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

2 PM
102 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 29.45 µg/m³
  • PM10: 33.6 µg/m³
  • O3: 0.071 ppm
  • NO2: 1.3 ppb
  • SO2: 0.8 ppb
  • CO: 0.19 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

3 PM
113 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 29.97 µg/m³
  • PM10: 34.14 µg/m³
  • O3: 0.074 ppm
  • NO2: 1.3 ppb
  • SO2: 0.9 ppb
  • CO: 0.19 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

4 PM
123 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 31.22 µg/m³
  • PM10: 35.58 µg/m³
  • O3: 0.077 ppm
  • NO2: 1.4 ppb
  • SO2: 1.1 ppb
  • CO: 0.19 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

5 PM
132 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 31.86 µg/m³
  • PM10: 36.38 µg/m³
  • O3: 0.079 ppm
  • NO2: 1.5 ppb
  • SO2: 1.2 ppb
  • CO: 0.20 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

6 PM
115 AQI
Unhealthy air quality for sensitive groups Dominant pollutant: O3
Details

Pollutant Concentrations:

  • PM2.5: 32.33 µg/m³
  • PM10: 37.28 µg/m³
  • O3: 0.074 ppm
  • NO2: 2.4 ppb
  • SO2: 1 ppb
  • CO: 0.20 ppm

Health Recommendations:

Members of sensitive groups may experience health effects. The general public is less likely to be affected.

7 PM
94 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 32.69 µg/m³
  • PM10: 38.13 µg/m³
  • O3: 0.065 ppm
  • NO2: 4 ppb
  • SO2: 0.8 ppb
  • CO: 0.22 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

8 PM
93 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 32.32 µg/m³
  • PM10: 38.16 µg/m³
  • O3: 0.058 ppm
  • NO2: 4.9 ppb
  • SO2: 0.6 ppb
  • CO: 0.23 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

9 PM
92 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 31.6 µg/m³
  • PM10: 37.62 µg/m³
  • O3: 0.051 ppm
  • NO2: 5.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.23 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

10 PM
92 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 31.71 µg/m³
  • PM10: 37.92 µg/m³
  • O3: 0.047 ppm
  • NO2: 5.5 ppb
  • SO2: 0.5 ppb
  • CO: 0.24 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.

11 PM
94 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 32.78 µg/m³
  • PM10: 39.26 µg/m³
  • O3: 0.045 ppm
  • NO2: 5.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.25 ppm

Health Recommendations:

Air quality is acceptable; some pollutants may pose a risk for a small number of unusually sensitive people.