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Today Hourly 7 days 30 days Air Quality
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Hourly Weather | Today › Thursday, December 4, 2025
Active Weather Warnings
Hayward, California
3 AM
Cloudy Night
45°
Feels Like 41°
0
Humidity: 66%
Wind: 6 mph
UV Index: 0
4 AM
Cloudy Night
43°
Feels Like 39°
0
Humidity: 68%
Wind: 6 mph
UV Index: 0
5 AM
Night
41°
Feels Like 37°
0
Humidity: 73%
Wind: 6 mph
UV Index: 0
6 AM
Night
39°
Feels Like 36°
0
Humidity: 77%
Wind: 6 mph
UV Index: 0
7 AM
Night
41°
Feels Like 37°
0
Humidity: 78%
Wind: 6 mph
UV Index: 0
8 AM
Sunny Weather
43°
Feels Like 43°
0
Humidity: 75%
Wind: 6 mph
UV Index: 1
9 AM
Cloudy Weather
46°
Feels Like 46°
0
Humidity: 73%
Wind: 6 mph
UV Index: 1
10 AM
Cloudy Weather
50°
Feels Like 52°
0
Humidity: 65%
Wind: 6 mph
UV Index: 2
11 AM
Cloudy Weather
54°
Feels Like 55°
0
Humidity: 59%
Wind: 6 mph
UV Index: 2
12 PM
Cloudy Weather
55°
Feels Like 59°
0
Humidity: 55%
Wind: 6 mph
UV Index: 3
1 PM
Cloudy Weather
57°
Feels Like 61°
0
Humidity: 53%
Wind: 7 mph
UV Index: 2
2 PM
Cloudy Weather
59°
Feels Like 63°
0
Humidity: 50%
Wind: 6 mph
UV Index: 2
3 PM
Cloudy Weather
57°
Feels Like 59°
0
Humidity: 54%
Wind: 6 mph
UV Index: 1
4 PM
Cloudy Weather
57°
Feels Like 57°
0
Humidity: 58%
Wind: 6 mph
UV Index: 1
5 PM
Cloudy Night
54°
Feels Like 54°
0
Humidity: 65%
Wind: 6 mph
UV Index: 0
6 PM
Cloudy Night
52°
Feels Like 50°
0
Humidity: 70%
Wind: 6 mph
UV Index: 0
7 PM
Cloudy Night
48°
Feels Like 48°
0
Humidity: 76%
Wind: 5 mph
UV Index: 0
8 PM
Cloudy Night
46°
Feels Like 46°
0
Humidity: 81%
Wind: 5 mph
UV Index: 0
9 PM
Cloudy Night
46°
Feels Like 46°
0
Humidity: 82%
Wind: 4 mph
UV Index: 0
10 PM
Cloudy Night
45°
Feels Like 45°
0
Humidity: 84%
Wind: 4 mph
UV Index: 0
11 PM
Cloudy Night
45°
Feels Like 45°
0
Humidity: 85%
Wind: 4 mph
UV Index: 0

Hourly Air Quality Forecast - AQI (US EPA)

3 AM
28 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 6.75 µg/m³
  • PM10: 13.49 µg/m³
  • O3: 0.026 ppm
  • NO2: 6.8 ppb
  • SO2: 0.5 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

4 AM
31 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.39 µg/m³
  • PM10: 14.47 µg/m³
  • O3: 0.025 ppm
  • NO2: 7.3 ppb
  • SO2: 0.5 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

5 AM
33 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 7.88 µg/m³
  • PM10: 15.24 µg/m³
  • O3: 0.024 ppm
  • NO2: 7.4 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

6 AM
34 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.1 µg/m³
  • PM10: 15.7 µg/m³
  • O3: 0.024 ppm
  • NO2: 7.1 ppb
  • SO2: 0.6 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

7 AM
34 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.2 µg/m³
  • PM10: 15.83 µg/m³
  • O3: 0.025 ppm
  • NO2: 6.6 ppb
  • SO2: 0.7 ppb
  • CO: 0.18 ppm

Health Recommendations:

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

8 AM
35 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.49 µg/m³
  • PM10: 15.71 µg/m³
  • O3: 0.024 ppm
  • NO2: 6.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.19 ppm

Health Recommendations:

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

9 AM
37 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 8.92 µg/m³
  • PM10: 15.99 µg/m³
  • O3: 0.024 ppm
  • NO2: 7.2 ppb
  • SO2: 0.7 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

10 AM
40 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 9.5 µg/m³
  • PM10: 16.44 µg/m³
  • O3: 0.025 ppm
  • NO2: 6.8 ppb
  • SO2: 0.7 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

11 AM
43 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 10.41 µg/m³
  • PM10: 17.22 µg/m³
  • O3: 0.027 ppm
  • NO2: 6.9 ppb
  • SO2: 0.9 ppb
  • CO: 0.21 ppm

Health Recommendations:

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

12 PM
49 AQI
Good air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 11.66 µg/m³
  • PM10: 18.38 µg/m³
  • O3: 0.030 ppm
  • NO2: 7.3 ppb
  • SO2: 1 ppb
  • CO: 0.22 ppm

Health Recommendations:

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

1 PM
52 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.16 µg/m³
  • PM10: 19.89 µg/m³
  • O3: 0.033 ppm
  • NO2: 7.8 ppb
  • SO2: 1.2 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.

2 PM
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.42 µg/m³
  • PM10: 21.34 µg/m³
  • O3: 0.036 ppm
  • NO2: 8.3 ppb
  • SO2: 1.3 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.

3 PM
57 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.13 µg/m³
  • PM10: 22.47 µg/m³
  • O3: 0.038 ppm
  • NO2: 9.1 ppb
  • SO2: 1.4 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.

4 PM
57 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 15.3 µg/m³
  • PM10: 23 µg/m³
  • O3: 0.037 ppm
  • NO2: 10.5 ppb
  • SO2: 1.5 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.

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

Pollutant Concentrations:

  • PM2.5: 14.83 µg/m³
  • PM10: 22.52 µg/m³
  • O3: 0.035 ppm
  • NO2: 12.1 ppb
  • SO2: 1.5 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.

6 PM
56 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.62 µg/m³
  • PM10: 22.33 µg/m³
  • O3: 0.033 ppm
  • NO2: 11.4 ppb
  • SO2: 1.5 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.

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

Pollutant Concentrations:

  • PM2.5: 14.6 µg/m³
  • PM10: 22.09 µg/m³
  • O3: 0.032 ppm
  • NO2: 10.2 ppb
  • SO2: 1.4 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.

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

Pollutant Concentrations:

  • PM2.5: 14.49 µg/m³
  • PM10: 21.68 µg/m³
  • O3: 0.031 ppm
  • NO2: 9.1 ppb
  • SO2: 1.2 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
55 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 14.4 µg/m³
  • PM10: 21.69 µg/m³
  • O3: 0.030 ppm
  • NO2: 8.4 ppb
  • SO2: 1 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
54 AQI
Moderate air quality Dominant pollutant: PM2.5
Details

Pollutant Concentrations:

  • PM2.5: 13.83 µg/m³
  • PM10: 21.49 µg/m³
  • O3: 0.028 ppm
  • NO2: 7.8 ppb
  • SO2: 1 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.

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

Pollutant Concentrations:

  • PM2.5: 12.6 µg/m³
  • PM10: 20.58 µg/m³
  • O3: 0.027 ppm
  • NO2: 6.7 ppb
  • SO2: 0.9 ppb
  • CO: 0.20 ppm

Health Recommendations:

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

Current Real-Time Air Quality Report

Weather Alerts and Warnings for Hayward

Minor Expected Likely

Coastal Flood Advisory

Coastal Flood Advisory issued December 3 at 9:39PM PST until December 7 at 3:00PM PST by NWS San Francisco CA
Dec 3, 9:39 PM → Dec 7, 3:00 PM
WHAT: Up to 1.4 ft of inundation above ground level is
possible in low lying areas near shorelines and tidal
waterways.

WHERE: Bayshore locations along the San Francisco Bay and San
Pablo Bay.

WHEN: Until 3 PM PST Sunday.

IMPACTS: Flooding of lots, parks, and roads with only
isolated road closures expected.

ADDITIONAL DETAILS: At the San Francisco tidal gauge high
tide is expected to be 1.2 ft above normal (7.00 ft MLLW) at
9:04 AM Wednesday, 1.4 ft above normal (7.20 ft MLLW) at 9:48
AM Thursday, 1.4 ft above normal (7.23 ft MLLW) at 10:35 AM
Friday, 1.2 ft above normal (7.08 ft MLLW) at 11:25 AM
Saturday, and 0.9 ft above normal (6.75 ft MLLW) at 12:17 PM
Sunday. High tide timing varies up to 90 minutes earlier or
later along the Pacific Coast and throughout the San Francisco
Bay respectively.
+ Read More
If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.
Updated: Dec 4, 1:07 AM Source: NWS Alert