Photo: Sanfranman59 · CC BY-SA 3.0San Leandro has some of the coolest summers among U.S. towns
In January the night’s low is typically 44°. Temperatures cover 32° across the year, low to high. Winters are mild: January nights here are milder than in 92% of U.S. towns. Garden chairs stay out from March to November, the months with highs of 64–76°.
A year in San Leandro at a glance
Each month’s typical high and low, and what it brings.
What stands out about San Leandro’s climate
Compared with towns across the U.S., with San Leandro’s place in California beside it.
What a year in San Leandro feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
A freeze most winters
Frost and day counts come from NOAA’s station at Oakland Metro International Airport, 3 miles from the city’s center point, at about the same height.
The 2023 USDA map puts San Leandro’s 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 18 inches of rain a year
December is the wettest month and July the driest. Rain falls on about 68 days a year. Snow is rare: about 0.0" in a normal year at Upper San Leandro Filters, CA, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in San Leandro
94% of the work is heating, so the furnace matters far more than the air conditioner. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Oakland Metro International Airport.
Living with San Leandro’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
Zone 10a. Frost comes about 6 winters in 10, so tender plants can often stay out through winter.
Months with highs of 62–84° and lows of 40° or more: March, April, May, June, July, August, September, October and November. 17 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in San Leandro from natural hazards, earthquakes are the largest share (74%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →San Leandro and its neighbors
Castro Valley has the coldest January nights next door (40°, 3° colder) and Castro Valley the hottest July afternoons (82°, 8° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like San Leandro’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| San Leandro, CA | 44° | 75° | 18" | 0.0" |
| Makawao, HI | 53° | 75° | 23" | 0.0" |
| Sequim, WA | 34° | 71° | 18" | 1.4" |
| Cedar Mill, OR | 36° | 81° | 39" | 3.6" |
| Hayden, ID | 25° | 83° | 26" | 27" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in San Leandro averaged 1.6° warmer than the 1900s. The biggest change is in January (+2.3°).
A bigger shift than in 63% of 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 San Leandro compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with San Leandro’s place among California’s.
San Leandro weather by month
Highs, lows and precipitation from NOAA’s grid at San Leandro’s center; snow, wet days and snow on the ground from Upper San Leandro Filters, CA. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 59° | 44° | 3.5" | 0.0" | 11 | 0 | 48° – 56° |
| February | 61° | 46° | 3.5" | 0.0" | 11 | 0 | 49° – 59° |
| March | 64° | 48° | 2.7" | 0.0" | 11 | 0 | 51° – 62° |
| April | 67° | 49° | 1.4" | 0.0" | 7 | 0 | 55° – 61° |
| May | 70° | 52° | 0.6" | 0.0" | 4 | 0 | 55° – 66° |
| June | 74° | 55° | 0.1" | 0.0" | 1 | 0 | 61° – 67° |
| July | 75° | 57° | 0.0" | 0.0" | 0 | 0 | 63° – 69° |
| August | 75° | 57° | 0.0" | 0.0" | 0 | 0 | 63° – 70° |
| September | 76° | 56° | 0.1" | 0.0" | 1 | 0 | 63° – 70° |
| October | 72° | 53° | 0.9" | 0.0" | 3 | 0 | 60° – 69° |
| November | 64° | 48° | 1.9" | 0.0" | 8 | 0 | 49° – 60° |
| December | 58° | 43° | 3.6" | 0.0" | 12 | 0 | 47° – 55° |
| Year | 68° | 51° | 18.2" | 0.0" | 68 | 0 |
How much a month can swing
A normal is an average. May swings the most: from 1991 to 2020 its average ranged from 55° to 66°. June is the most reliable, staying within 6°.
Where San Leandro’s 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 San Leandro’s center.
- Snow: Upper San Leandro Filters, CA.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Oakland Metro International Airport, 3 miles from the city’s center point, at about the same height; 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 San Leandro’s climate
What is the weather like in San Leandro?
A typical July afternoon reaches 75°, a January night drops to 44°, and snow is almost unheard of. Milder January nights than 92% of U.S. towns; cooler July afternoons than all but 190 U.S. towns.
How cold does it get in San Leandro in winter?
December nights average 43°. About 3 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 47°.
How much snow does San Leandro get?
About 0.0 inches in a normal winter at Upper San Leandro Filters, CA, so most winters see none.
How hot does it get in San Leandro?
July, with a typical high of 75° and a low of 57°. About 6 days a year reach 90° (Oakland Metro International Airport).
When is the first and last frost in San Leandro?
There is no reliable frost date: a 32° night comes in about 63% of winters at Oakland Metro International Airport, so most years bring a freeze but some pass without one.
What growing zone is San Leandro 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 San Leandro?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, May, June, July, August, September, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is San Leandro getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 63% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in San Leandro.
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.