Fremont, California Weather
Coastal fog thickens at dawn. Day 77 of spring. Read this microseason across nine climate regions →
Fremont weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 4Foggy——78°55°—
- FridayJun 5Overcast——85°54°+7°
- SaturdayJun 6Overcast——71°53°-14°
- SundayJun 7Overcast——74°54°+3°
- MondayJun 8Drizzle—0.14″65°54°-9°
- TuesdayJun 9Drizzle—0.06″66°55°+1°
- WednesdayJun 10Mostly Clear——79°55°+13°
PM2.5 at 9.7 µg/m³, PM10 at 13.2 µg/m³ — typical background levels with no transport signature. AQI down 7 over the last 6 hours (steady decline since this morning).
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 43 now. With UV 10 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 58 by mid-afternoon.
- Present
- AQI 43
- UV peak
- 10.1 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 58
PM × Wind × Precip
PM2.5 at 9.7 µg/m³, PM10 at 13.2 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.73
- 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).
A summer fog for fair, a winter fog for rain.
- Moonrise
- 6:32 AM
- Moonset
- 4:22 PM
- In sign
- ♒︎ Aquarius
Coastal fog thickens at dawn
Fremont at a glance
- Today vs. normal: 77°F — typical for the season
- Last frost: April 1 (climatological average for this latitude)
- Microseason: Jun 1–5
- Planting window: Harvest spring lettuce before it bolts. Sow heat-tolerant greens.
Right now in the garden
Peak growing season
As of June 4, 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.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| January | — | — |
| February | — | — |
| March | — | — |
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, radishes |
| July | tomatoes, peppers, beans, squash | tomatoes, beans, summer squash |
| August | — | tomatoes, beans, summer squash |
| September | fall brassicas, garlic (overwinter), carrots | tomatoes, beans, summer squash |
| October | fall brassicas, garlic (overwinter), carrots | winter squash, tomatoes (last) |
| November | — | — |
| December | — | — |
A year in weather
August brings Fremont's warmest temperatures (~68°F mean) while December delivers its coldest (~51°F). Rainfall peaks in February (3.2 inches) and bottoms out in July (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 51° | 3.0″ | 6 |
| February | 53° | 3.2″ | 7 |
| March | 56° | 2.5″ | 6 |
| April | 58° | 1.2″ | 4 |
| May | 62° | 0.5″ | 2 |
| June | 65° | 0.2″ | 0 |
| July | 67° | 0.0″ | 0 |
| August | 68° | 0.0″ | 0 |
| September | 67° | 0.1″ | 0 |
| October | 63° | 0.7″ | 2 |
| November | 55° | 1.6″ | 4 |
| December | 51° | 3.0″ | 7 |
Regional context
Fremont belongs to a hot-summer Mediterranean climate region — a cohort that shares similar temperature ranges, seasonal patterns, and growing conditions across nearby cities.
Similar climates: Los Angeles, CA, San Francisco, CA, San Diego, CA, Riverside, CA, Sacramento, CA.
Naturalist notes
California poppies begin their peak bloom across Fremont's open spaces during late April and early May.
Anna's hummingbirds start their courtship displays in February, diving and calling from perches throughout the area.
Frequently asked
- When does it freeze in Fremont?
- Fremont's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Fremont?
- February is the wettest month with about 3.2 inches of rain on average; the city receives roughly 16 inches annually.
- What is the warmest month in Fremont?
- August is typically warmest, averaging about 68°F.
- What is the coldest month in Fremont?
- December is typically coldest, averaging about 51°F.
- When can I start a vegetable garden in Fremont?
- Cool-season crops (peas, lettuce) can be sown around the last spring frost (mid-April); warm-season crops (tomatoes, peppers) wait until 1–2 weeks after.
- How many rainy days does Fremont get?
- Fremont averages about 37 rainy days per year.
- What hardiness zone is Fremont?
- Fremont's USDA hardiness zone is determined by its lowest average winter temperature; check the USDA's online lookup with the city ZIP for the current zone designation.
Climate
Fremont, California experiences a hot-summer Mediterranean climate zone. January temperatures hover near 51°F while July averages 67°F — a 17°F seasonal swing.
Throughout the year, Fremont receives about 16 inches of precipitation spread over roughly 37 rainy days.
Latitude (37.5°N), proximity to large water bodies, and elevation determine the rhythm of the year — shaping what grows here, when frost is likely, and what the weather story looks like day to day.