What is the air quality in Castro Valley today?

The current Air Quality Index (AQI) in Castro Valley is 20 (Good). PM2.5 concentration is 4.69 µg/m³.

What is the temperature in Castro Valley right now?

The current temperature in Castro Valley is 16.8°C (feels like 16.8°C). Humidity is 67.0% and wind speed is 5.3 km/h.

Is it safe to go outside in Castro Valley?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0 (Moderate).

Air Quality in Castro Valley, United States

Drizzle

16.8°C · 67.0% humidity

16.8°

Feels 16.8°

Good

Air quality is satisfactory. Enjoy outdoor activities.

63 stations

Nearby Monitoring Stations

AQI Forecast Calibrated

18 4pm

18 7pm

18 10pm

18 1am

18 4am

43 7am

68 10am

30 1pm

Station readings

CAMS model adj -7

PM2.5 Trend (24h)

25h · 106 stations

67.0%

Humidity

5.3 km/h

Wind WSW

1011.5 hPa

Pressure

2.9

UV Moderate

GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for Castro Valley?

Temperature & Precipitation

PM2.54.69 µg/m³ ✓ WHO

Good

PM1027.45 µg/m³

Good

UV INDEX2.9

Moderate

Station readings (63 stations within 25 km)

4.69

Median

4.76

Average

1.98

Low

8.96

High

PM2.5 µg/m³ · Model: 7.4 · Bias: +2.7

What is the 7-day forecast for Castro Valley?

04-09

19.5° 11.9°

0.25 mm

04-10

17.6° 9.6°

3.94 mm

04-11

17.3° 8.9°

0.06 mm

04-12

12.5° 6.1°

2.25 mm

04-13

15.0° 3.9°

0.25 mm

04-14

18.4° 5.5°

04-15

21.2° 8.3°

Both models agree Avg diff: 2.5°C

Where are air quality stations near Castro Valley?

–

united-states-of-america-castro-valley-briar-ridge-drive

3.4 km PM2.5: 0.0 µg/m³ PM10: 0.0 µg/m³

Grass Valley ES

7.4 km PM2.5: 6.3 µg/m³

Madison Park Academy HS

8.8 km PM2.5: 4.3 µg/m³

Esperanza ES

9.1 km PM2.5: 5.0 µg/m³

Elmhurst United MS

9.1 km PM2.5: 5.4 µg/m³

Oakland - East, Alameda, California

9.1 km

Oakland - East, Alameda, California

9.1 km

Oakland - East, Alameda, California

9.1 km

Lifers 105th

9.2 km PM2.5: 6.0 µg/m³

Oakland Academy of Knowledge (OAK) ES

9.5 km PM2.5: 5.7 µg/m³

What cities are near Castro Valley?

20 Hayward 19 San Lorenzo 19 San Leandro 20 San Ramon 19 Moraga 18 Alameda 23 Pleasanton 18 Oakland 19 Orinda 19 Foster City

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-09T19:07 UTC.