Alta Sierra, California Weather
Bay laurel fragrance sweetens shade. Day 90 of spring. Read this microseason across nine climate regions →
Alta Sierra weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 17Clear——75°57°—
- ThursdayJun 18Clear——72°56°-3°
- FridayJun 19Clear——75°50°+3°
- SaturdayJun 20Clear——74°44°-1°
- SundayJun 21Clear——76°48°+2°
- MondayJun 22Clear——84°50°+8°
- TuesdayJun 23Clear——86°54°+2°
AQI 33 (Good), driven by PM2.5. AQI projected to climb to 65 over the next 6 hours. PM2.5 at 12.6 µg/m³ (AQI 58), ratio 0.41 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 55 now. With UV 8.0 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 59 around 1 PM.
- Present
- AQI 55
- UV peak
- 8.0 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 59
PM × Wind × Precip
PM2.5 at 12.6 µg/m³ (AQI 58), ratio 0.41 with 9 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.41
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- transport
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 8:13 AM
- Moonset
- 10:21 PM
- In sign
- ♌︎ Leo
Bay laurel fragrance sweetens shade
Alta Sierra at a glance
- Today vs. normal: 10°F below the seasonal normal for this latitude
- Last frost: March 21 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Alta Sierra
- Wed75°57°0%
- Thu72°56°1%
- Fri75°50°0%
- Sat74°44°0%
- Sun76°48°0%
- Mon84°50°0%
- Tue86°54°0%
- Wed87°55°1%
- Thu86°56°1%
- Fri89°57°0%
- Sat91°58°0%
- Sun91°60°0%
- Mon87°58°0%
- Tue86°57°0%
- Wed87°59°0%
- Thu87°57°0%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of June 17, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
ZIP codes in Alta Sierra
- 93285