Concord, California Weather
Ceanothus blooms again. Day 93 of summer. Read this microseason across nine climate regions →
Concord weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 7:23 AM PDT · Open-Meteo
- TodaySep 21Clear——72°55°—
- TuesdaySep 22Clear——79°55°+7°
- WednesdaySep 23Clear——89°59°+10°
- ThursdaySep 24Overcast——85°64°-4°
- FridaySep 25Overcast——81°61°-4°
- SaturdaySep 26Overcast——82°60°+1°
- SundaySep 27Overcast——78°57°-4°
Air quality now AQI 50 · Good
AQI 50 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 8.5 µg/m³, PM10 at 10.7 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 8.5 µg/m³, PM10 at 10.7 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.79
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:38 PM
- Moonset
- 1:41 AM
- In sign
- ♑︎ Capricorn
Ceanothus blooms again
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Concord at a glance
- Today vs. normal: Today averages 64°F (high 72°F, low 55°F), 6°F below the 70°F normal for Sep 21
- Last frost: January 9 (1991–2020 median, NOAA station 5 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant tomatoes, peppers, beans, squash, fall brassicas, carrots; harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Concord
- Mon72°55°1%
- Tue79°55°1%
- Wed89°59°0%
- Thu85°64°0%
- Fri81°61°0%
- Sat82°60°0%
- Sun78°57°1%
- Mon87°61°1%
- Tue93°67°1%
- Wed94°69°3%
- Thu88°74°1%
- Fri89°78°6%
- Sat99°75°0%
- Sun92°68°0%
- Mon85°60°0%
- Tue82°62°0%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Concord
Interactive wind and temperature map centered on Concord — it loads in your browser. Open the full weather map.
Right now in the garden
Peak growing season
As of September 21, the growing season is at its peak — the first frost (around December 14) is weeks away. Fall transplants go in about 10–12 weeks before the first frost, September 21 to October 5 here. This city's planting calendar for September: plant tomatoes, peppers, beans, squash, fall brassicas, and carrots; harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Concord
Concord sits in Contra Costa County, where the year’s longest day runs 14h 48m of daylight and its shortest just 9h 32m — a swing of +5h 17m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Los Angeles, the state’s largest city, lies about 334 miles to the SE. The nearest town Concord tracks is Antioch, roughly 11 miles to the E.
Air quality in Concord
Air quality in Concord’s county has held roughly steady since 2020; its cleanest year on record was 2021 (median AQI 47). See the full air-quality history for Concord.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | lettuce, peas, spinach, radishes | spinach, radishes, fall brassicas, carrots |
| February | — | lettuce, peas, spinach, radishes |
| March | — | lettuce, peas, spinach |
| April | tomatoes, peppers, beans, squash | peas |
| May | tomatoes, peppers, beans, squash | garlic |
| June | beans, squash | beans, summer squash |
| July | beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| August | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, winter squash |
| September | tomatoes, peppers, beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash |
| November | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| December | lettuce, peas, spinach, radishes | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
A year in weather
Concord's warmest month is August (~74°F mean) and its coldest is January (~49°F). Rainfall peaks in January (3.2 inches) and bottoms out in July (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 49° | 3.2″ | 9 |
| February | 53° | 3.2″ | 9 |
| March | 57° | 2.3″ | 9 |
| April | 60° | 1.1″ | 5 |
| May | 65° | 0.5″ | 3 |
| June | 71° | 0.2″ | 1 |
| July | 73° | 0.0″ | 0 |
| August | 74° | 0.0″ | 0 |
| September | 72° | 0.1″ | 1 |
| October | 65° | 0.7″ | 3 |
| November | 56° | 1.6″ | 7 |
| December | 50° | 3.2″ | 10 |
Regional context
Similar climates Pacheco, CA, Clyde, CA, Pleasant Hill, CA
In Concord, NOAA NCEI 1991-2020 normals put January near 49°F and July near 73°F — a 24°F seasonal arc — with about 16.1 inches of precipitation over 57 rainy or snowy days.
Precipitation in Concord peaks in the cool season: January averages 3.2 inches across 9.0 storm-fed days, while July bottoms out at 0.0 inches over just 0.0 rainy days. That cool-season-wet pattern aligns Concord with places like Pacheco, CA, Clyde, CA and Pleasant Hill, CA.
Around January 9, Concord sheds its freezing nights — lettuce, chard, arugula, and mustard greens go into Concord's beds. Heat-demanding starts go out a fortnight on in Concord, after the soil warms and cold snaps clear. Frost returns to Concord near December 14, ending the tender-crop season. Open lawns in Concord whiten first when frost returns.
Similar climates: Pacheco, CA, Clyde, CA, Pleasant Hill, CA, Contra Costa Centre, CA, Clayton, CA.
Frequently asked
- When does it freeze in Concord?
- Concord's last spring frost lands near January 9, and in Concord the first fall frost follows around December 14.
- What is the rainy season in Concord?
- Rainfall in Concord peaks in January near 3.2 inches, out of about 16 inches annually.
- What is the warmest month in Concord?
- August is Concord's warmest month, averaging about 74°F.
- What is the coldest month in Concord?
- Concord bottoms out in January, with a mean near 49°F.
- When can I start a vegetable garden in Concord?
- Frost-hardy sowings begin at January 9 in Concord; warm-season starts follow two weeks on.
- How many rainy days does Concord get?
- Concord records around 57 days of measurable precipitation annually.
- What hardiness zone is Concord?
- Concord sits in the USDA zone set by January lows near 49°F; the USDA ZIP tool gives the band.
- What is the 10-day forecast for Concord?
- Concord's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Concord?
- See this week's day-by-day rain chances for Concord in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Concord?
- Current conditions for Concord and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Concord forecast updated?
- The Concord forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Concord?
- Today's sunrise and sunset times for Concord are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Concord?
- The next few days in Concord's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Concord sits at 38.0°N; its climate zone is hot-summer Mediterranean (Köppen approximation).
ZIP codes in Concord
- 94518
- 94519
- 94520
- 94521
- 94522
- 94524
- 94527
- 94565