Johnsville, California Weather
Summer heat deepens across the valleys. Day 15 of summer. Read this microseason across nine climate regions →
Johnsville weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 5Overcast——75°57°—
- MondayJul 6Partly Cloudy——75°56°0°
- TuesdayJul 7Overcast——80°48°+5°
- WednesdayJul 8Clear——83°44°+3°
- ThursdayJul 9Clear——84°47°+1°
- FridayJul 10Overcast——85°50°+1°
- SaturdayJul 11Overcast——88°51°+3°
AQI 28 (Good), driven by Ozone. AQI down 10 over the last 6 hours (gradual decline). Ozone at AQI 47. Overcast through the UV peak window (cloud cover ~79%) — afternoon ozone should stay flat.
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 47. Overcast through the UV peak window (cloud cover ~79%) — afternoon ozone should stay flat.
- Present
- AQI 47
- UV peak
- 8.1 at 1 PM
- Sky at peak
- overcast
- Projected peak
- AQI 25
PM × Wind × Precip
PM2.5 at 7.5 µg/m³ (AQI 42), ratio 0.55 with 7 mph wind — characteristic of long-range haze transport rather than a local source.
- PM2.5/PM10
- 0.55
- 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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:23 PM
- Moonset
- 11:20 AM
- In sign
- ♓︎ Pisces
Summer heat deepens across the valleys
Johnsville at a glance
- Today vs. normal: 71°F — typical for the season
- Last frost: April 15 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
16-Day Forecast — Johnsville
- Sun75°57°1%
- Mon75°56°2%
- Tue80°48°0%
- Wed83°44°0%
- Thu84°47°0%
- Fri85°50°0%
- Sat88°51°0%
- Sun88°53°1%
- Mon92°61°4%
- Tue92°62°5%
- Wed87°55°5%
- Thu79°50°4%
- Fri86°52°10%
- Sat91°57°9%
- Sun91°59°13%
- Mon87°57°13%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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.
SPC Convective Outlook
Storm Prediction Center — Johnsville
SPC includes Johnsville in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- TOMORROWNONENo severe risk
- DAY 3NONENo severe risk
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Johnsville
- 96103