Weather in Calwa, California
Fog and sun in daily rhythm. Day 58 of spring. Read this microseason across nine climate regions →
- TodayMay 16Clear—83°59°
- SundayMay 17Partly Cloudy—79°56°
- MondayMay 18Clear—85°50°
- TuesdayMay 19Clear—92°67°
- WednesdayMay 20Overcast—95°70°
- ThursdayMay 21Overcast—98°71°
- FridayMay 22Clear—97°70°
- PM 2.5
- 9.8 μg/m³
- PM 10
- 43.8 μg/m³
- NO₂
- 0.8 μg/m³
- Ozone
- 114.0 μg/m³
- UV Index
- 3.6 Moderate
Flowers blooming in late autumn, a sure sign of a bad winter coming.
- Moonrise
- 12:18 PM
- Moonset
- 2:17 AM
- In sign
- ♉︎ Taurus
Fog and sun in daily rhythm
Calwa at a glance
- Today vs. normal: 7°F above the seasonal normal for this latitude
- Last frost: March 27 (climatological average for this latitude)
- Microseason: 28 of 72, May 16–20
- Planting window: Direct sow okra, melons, and southern peas. Thin carrot rows.
Right now in the garden
Warm-season window is open
As of May 16, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
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
Calwa's warmest month is July (~84°F mean) and its coldest is December (~48°F). Rainfall peaks in January (2.2 inches) and bottoms out in August (0.0 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 48° | 2.2″ | 5 |
| February | 52° | 1.9″ | 5 |
| March | 57° | 1.9″ | 4 |
| April | 62° | 1.0″ | 2 |
| May | 70° | 0.4″ | 1 |
| June | 78° | 0.2″ | 0 |
| July | 84° | 0.0″ | 0 |
| August | 82° | 0.0″ | 0 |
| September | 77° | 0.1″ | 0 |
| October | 67° | 0.6″ | 1 |
| November | 55° | 0.9″ | 2 |
| December | 48° | 1.8″ | 4 |
Frequently asked
- When does it freeze in Calwa?
- Calwa's last spring frost typically falls around mid-April, and the first fall frost arrives around mid-November.
- What is the rainy season in Calwa?
- January is the wettest month with about 2.2 inches of rain on average; the city receives roughly 11 inches annually.
- What is the warmest month in Calwa?
- July is typically warmest, averaging about 84°F.
- What is the coldest month in Calwa?
- December is typically coldest, averaging about 48°F.
- When can I start a vegetable garden in Calwa?
- 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 Calwa get?
- Calwa averages about 26 rainy days per year.
- What hardiness zone is Calwa?
- Calwa'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
Calwa, California sits in a hot-summer Mediterranean climate zone. January means hover near 48°F while July averages 84°F — a 36°F seasonal swing.
Across the year, Calwa receives about 11 inches of precipitation spread over roughly 26 rainy days.
The rhythm of the year is set by latitude (36.7°N), proximity to large water bodies, and elevation — all of which shape what grows here, when frost is likely, and what the weather story looks like day to day.