Somis has milder winter nights than 92% of U.S. towns
Peak summer warmth arrives in July, with afternoons near 84°. Precipitation is light here, less than falls on 92% of U.S. towns. Decade by decade the climate has edged up, 2.5° above 1901–2000. Long walks are most pleasant from September to July, when afternoons reach 67–84°.
A year in Somis at a glance
Each month’s typical high and low, and what it brings.
What stands out about Somis’ climate
Compared with towns across the U.S., with Somis’ place in California beside it.
What a year in Somis feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
Frost is rare
Frost and day counts come from NOAA’s station at Camarillo Airport, 6 miles from the town’s center, 290 ft lower.
The 2023 USDA map puts Somis’ center in zone 10a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 32°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 17 inches of rain a year
February is the wettest month and August the driest.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Somis
71% of the work is heating. Months averaging under 55° run from December.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Camarillo Airport.
Living with Somis’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 1 winter in 3, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: January, February, March, April, May, June, July, September, October, November and December. 0.4 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Somis from natural hazards, wildfire is the largest share (45%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Somis and similar climates
TownRatings has no climate map of the towns around Somis yet.
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Somis averaged 2.5° warmer than the 1900s. The biggest change is in January (+3.4°).
A bigger shift than in all but 73 U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Somis compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Somis’ place among California’s.
Somis weather by month
Highs, lows and precipitation from NOAA’s grid at Somis’ center. 1991–2020 normals.
| Month | High | Low | Rain + melt | 30-yr range |
|---|---|---|---|---|
| January | 68° | 44° | 4.0" | 52° – 61° |
| February | 68° | 44° | 4.4" | 52° – 62° |
| March | 70° | 46° | 2.7" | 52° – 64° |
| April | 73° | 48° | 0.8" | 56° – 64° |
| May | 75° | 52° | 0.3" | 60° – 68° |
| June | 79° | 56° | 0.0" | 64° – 70° |
| July | 84° | 60° | 0.0" | 68° – 77° |
| August | 85° | 59° | 0.0" | 68° – 76° |
| September | 84° | 58° | 0.1" | 68° – 76° |
| October | 79° | 53° | 0.7" | 63° – 73° |
| November | 73° | 47° | 1.0" | 54° – 64° |
| December | 67° | 43° | 3.0" | 52° – 60° |
| Year | 75° | 51° | 16.9" |
How much a month can swing
A normal is an average. March swings the most: from 1991 to 2020 its average ranged from 52° to 64°. June is the most reliable, staying within 6°.
Where Somis’ numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Somis’ center.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Camarillo Airport, 6 miles from the town’s center, 290 ft lower; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Somis’ climate
What is the weather like in Somis?
A typical July afternoon reaches 84°, a January night drops to 44°. Milder January nights than 92% of U.S. towns; cooler July afternoons than 62% of U.S. towns.
How cold does it get in Somis in winter?
December nights average 43°. About 1 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 52°.
How hot does it get in Somis?
July, with a typical high of 84° and a low of 60°. About 9 days a year reach 90° (Camarillo Airport).
When is the first and last frost in Somis?
Most years have no frost at all: a 32° night comes in about 29% of winters at Camarillo Airport, usually in December or January.
What growing zone is Somis in?
Zone 10a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 32°.
What is the best time of year to visit Somis?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, April, May, June, July, September, October, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Somis getting warmer?
Yes: 1991–2020 averaged 2.5° warmer than 1901–2000 on NOAA’s grid. A bigger shift than all but 73 U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Somis.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.