Seaside, Oregon climate: Normal weather by month, frost dates and records
Seaside's normal year runs from 39°F December nights to 66°F August afternoons, with 76.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.9°C, December lows of 4°C, August highs of 19°C, 1,948 mm of precipitation a year.
- NOAA stationSeaside
- Station IDUSC00357641
- Location45.99°N 123.92°W
- Elevation10 ft (3 m)
- Population7,110
On October 23, the normal high in Seaside is 60°F and the normal low 45°F, and the chance of measurable rain or snow is 52%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Seaside.
- Jan 52° 39°
- Feb 53° 38°
- Mar 54° 40°
- Apr 56° 42°
- May 60° 46°
- Jun 62° 50°
- Jul 65° 53°
- Aug 66° 54°
- Sep 67° 50°
- Oct 62° 46°
- Nov 55° 42°
- Dec 51° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Seaside each month?
August is the warmest month, with normal highs of 66°F; December the coldest, with normal lows of 39°F. The most precipitation falls in November (12.01 in), the least in July (0.95 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 52°F | 39°F | 45.6°F | 11.03 | 21 | <1 | 6 | 9 h |
| February | 53°F | 38°F | 45.5°F | 8.05 | 18 | <1 | 6 | 10 h 20 min |
| March | 54°F | 40°F | 46.8°F | 9.42 | 21 | <1 | 5 | 11 h 50 min |
| April | 56°F | 42°F | 49.0°F | 6.56 | 17 | <1 | 2 | 13 h 30 min |
| May | 60°F | 46°F | 53.0°F | 3.87 | 14 | <1 | <1 | 14 h 50 min |
| June | 62°F | 50°F | 56.2°F | 2.66 | 11 | <1 | <1 | 15 h 40 min |
| July | 65°F | 53°F | 59.0°F | 0.95 | 7 | <1 | <1 | 15 h 30 min |
| August | 66°F | 54°F | 60.0°F | 1.20 | 7 | <1 | <1 | 14 h 10 min |
| September | 67°F | 50°F | 58.3°F | 2.91 | 9 | <1 | <1 | 12 h 40 min |
| October | 62°F | 46°F | 53.6°F | 6.63 | 15 | <1 | 1 | 11 h |
| November | 55°F | 42°F | 48.4°F | 12.01 | 20 | <1 | 4 | 9 h 30 min |
| December | 51°F | 39°F | 44.8°F | 11.42 | 22 | <1 | 6 | 8 h 40 min |
| Year (annual) | 59°F | 45°F | 51.7°F | 76.71 | 181 | <1 | 29 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 11°C | 4°C | 7.6°C | 280 mm |
| February | 11°C | 4°C | 7.5°C | 204 mm |
| March | 12°C | 4°C | 8.2°C | 239 mm |
| April | 13°C | 5°C | 9.4°C | 167 mm |
| May | 15°C | 8°C | 11.7°C | 98 mm |
| June | 17°C | 10°C | 13.4°C | 68 mm |
| July | 18°C | 12°C | 15.0°C | 24 mm |
| August | 19°C | 12°C | 15.6°C | 30 mm |
| September | 19°C | 10°C | 14.6°C | 74 mm |
| October | 16°C | 8°C | 12.0°C | 168 mm |
| November | 13°C | 5°C | 9.1°C | 305 mm |
| December | 11°C | 4°C | 7.1°C | 290 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357641; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Seaside?
Normal highs sit between 65°F and 85°F in July, August and September. Of those, July has the fewest days with rain (7).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357641.
When is the last frost in Seaside?
In Seaside, the last spring frost (32°F) comes after April 2 in half of years and after April 29 in one year in ten; the first autumn frost comes before November 12 in half of years and before October 18 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 21 year in 10 after April 29; 9 in 10 after March 4
- First autumn frost, half of years before
- November 121 year in 10 before October 18; 9 in 10 before December 6
NOAA puts the median frost-free season at 223 days, and the season without a hard freeze (28°F) at 285 days.
A hard freeze (28°F) comes after February 27 in half of springs and before December 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Seaside in zone 9a in ZIP code 97110, the nearest ZIP area.
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00357641; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Seaside?
In a normal year in Seaside, a 90°F day is rare, 29 nights fall to 32°F or colder and 181 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 29a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 181a normal year
The highest temperature in this station's record (since 1930) is 95°F, on September 23, 1943; the lowest is 5°F, on December 8, 1972.
The wettest calendar year on that record is 1950, with 108.37 in; the snowiest season is 1968–69, with 25.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00357641; records: ACIS (NOAA Regional Climate Centers), station USC00357641. Records use complete months only; a month missing more than three days is left out.
How sunny is Seaside?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Seaside, 3.7 kWh per square metre a day. July is the sunniest month (83%) and December the cloudiest (52%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 54% | 1.2 |
| February | 60% | 2.1 |
| March | 59% | 3.0 |
| April | 63% | 4.3 |
| May | 68% | 5.4 |
| June | 70% | 6.0 |
| July | 83% | 6.8 |
| August | 83% | 5.8 |
| September | 78% | 4.3 |
| October | 67% | 2.6 |
| November | 56% | 1.4 |
| December | 52% | 1.0 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Seaside need?
A normal year in Seaside brings 4,858 heating degree days, 10% fewer than the median U.S. place (5,373), and 12 cooling degree days, 99% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,402 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 603 | 0 |
| February | 546 | 0 |
| March | 564 | 0 |
| April | 480 | 0 |
| May | 373 | 1 |
| June | 263 | 0 |
| July | 187 | 1 |
| August | 159 | 3 |
| September | 206 | 6 |
| October | 354 | 1 |
| November | 498 | 0 |
| December | 625 | 0 |
| Year (annual) | 4,858 | 12 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00357641. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Seaside's climate compare?
Seaside is warmer than 50 of the other 104 places with their own NOAA record in Oregon, and wetter than 87. Across the 7,247 U.S. stations with normals, its annual mean of 51.7°F is warmer than 48%.
In the Köppen classification computed from these normals, Seaside is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Seaside share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Gearhart, OR1,872 people · 3 mi N
- Cannon Beach, OR1,500 people · 7 mi S
- Neahkahnie, OR300 people · 18 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Seaside's climate
What is the coldest month in Seaside?
December, with a normal high of 51°F and a normal low of 39°F. The warmest is August (66°F by day, 54°F at night).
Does it snow in Seaside?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Seaside?
November, with 12.01 in of precipitation in a normal year; the driest is July with 0.95 in.
What plant hardiness zone is Seaside in?
The USDA's 2023 map puts Seaside in zone 9a in ZIP code 97110, the nearest ZIP area.
How late can frost come in Seaside?
In half of years the last 32°F night comes after April 2; in one year in ten it comes after April 29. Waiting until April 29 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Seaside in OctoberThis month day by day, its records and recent years
- Oregon climateThe statewide normals and every place in the state
- Fort Clatsop National Mem, OR11 miles from this station, 51.8°F a year
- Astoria, OR12 miles from this station, 51.4°F a year
- Long Beach, WA27 miles from this station, 49.8°F a year
- Naselle, WA28 miles from this station, 50.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made