Hardly any U.S. towns collect more precipitation than San Marine: 82 inches a year
Midwinter brings lows of about 40°. December is the wettest month, July the driest. By July afternoons alone, it runs cooler than almost every U.S. town. Tender plants can go out after about February 19; in half of years the first frost comes by December 11.
A year in San Marine at a glance
Each month’s typical high and low, and what it brings.
What stands out about San Marine’s climate
Compared with towns across the U.S., with San Marine’s place in Oregon beside it.
What a year in San Marine feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 303 frost-free days a year
In half of years the last 32° night comes by February 19 and the first by December 11. Frost and day counts come from NOAA’s station at Yachats, OR, 1.7 miles from the town’s center, at about the same height.
The 2023 USDA map puts San Marine’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 28°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
About 82 inches of rain a year
December is the wettest month and July the driest. Rain falls on about 161 days a year. Snow is rare: about 0.9" in a normal year at Yachats, OR, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in San Marine
Nearly all of the work is heating: a normal year has almost no cooling days. Months averaging under 55° run from October through May.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Yachats, OR.
Living with San Marine’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
303 frost-free days in zone 9b. The last frost comes by Feb 19 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 11.
Months with highs of 62–84° and lows of 40° or more: June, July, August and September. 3.6 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in San Marine from natural hazards, river flooding is the largest share (50%); heat waves, cold waves, winter storms and ice storms together are 1%. Normals are averages; the hazards page covers the extremes.
Natural hazards →San Marine and similar climates
TownRatings has no climate map of the towns around San Marine yet.
Climates most like San Marine’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 Marine, OR | 40° | 67° | 82" | 0.9" |
| Hoquiam, WA | 37° | 68° | 81" | 0.5" |
| Crescent City, CA | 42° | 64° | 69" | 0.0" |
| Kodiak, AK | 26° | 62° | 78" | 70" |
| East Flat Rock, NC | 29° | 83° | 64" | 6.7" |
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 San Marine averaged 0.9° warmer than the 1900s. The biggest change is in January (+2.3°).
A smaller shift than in 82% 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 Marine compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with San Marine’s place among Oregon’s.
San Marine weather by month
Highs, lows and precipitation from NOAA’s grid at San Marine’s center; snow, wet days and snow on the ground from Yachats, OR. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 51° | 40° | 12.6" | 0.3" | 18 | 0 | 40° – 51° |
| February | 52° | 39° | 9.6" | 0.4" | 17 | 0 | 39° – 52° |
| March | 54° | 39° | 10.0" | 0.0" | 20 | 0 | 43° – 53° |
| April | 56° | 41° | 6.7" | 0.0" | 17 | 0 | 45° – 54° |
| May | 61° | 45° | 4.0" | 0.0" | 12 | 0 | 48° – 58° |
| June | 64° | 49° | 2.5" | 0.0" | 10 | 0 | 53° – 61° |
| July | 67° | 51° | 0.6" | 0.0" | 5 | 0 | 55° – 62° |
| August | 68° | 52° | 0.8" | 0.0" | 5 | 0 | 58° – 64° |
| September | 67° | 50° | 2.2" | 0.0" | 7 | 0 | 55° – 62° |
| October | 61° | 46° | 6.8" | 0.0" | 13 | 0 | 51° – 58° |
| November | 55° | 42° | 11.8" | 0.0" | 19 | 0 | 43° – 53° |
| December | 50° | 39° | 14.1" | 0.2" | 19 | 0 | 40° – 48° |
| Year | 59° | 44° | 81.8" | 0.9" | 161 | 1 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 39° to 52°. August is the most reliable, staying within 6°.
Where San Marine’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 Marine’s center.
- Snow: Yachats, OR (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Yachats, OR, 1.7 miles from the town’s center, 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 Marine’s climate
What is the weather like in San Marine?
A typical July afternoon reaches 67°, a January night drops to 40°, and snow is almost unheard of. Milder January nights than 88% of U.S. towns; cooler July afternoons than all but 47 U.S. towns.
How cold does it get in San Marine in winter?
February nights average 39°. About 7 nights a year reach 32° or below. In the coldest February of the last 30 years the month averaged 39°.
How much snow does San Marine get?
About 0.9 inches in a normal winter at Yachats, OR, so most winters see none.
How hot does it get in San Marine?
July, with a typical high of 67°. 90° days are rare: none in a normal year at Yachats, OR.
When is the first and last frost in San Marine?
In half of years the last spring frost (32°) comes by February 19 and the first fall frost by December 11, about 303 frost-free days, at Yachats, OR.
What growing zone is San Marine in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 28°.
What is the best time of year to visit San Marine?
By one simple rule (highs of 62–84° and lows of 40° or more), June, July, August and September. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is San Marine getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 82% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in San Marine.
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.