Olympia, Washington Weather
Fog locks the valleys. Day 93 of summer. Read this microseason across nine climate regions →
Olympia weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 7:20 AM PDT · Open-Meteo
- TodaySep 21Overcast later——73°48°—
- TuesdaySep 22Overcast——70°53°-3°
- WednesdaySep 23Overcast——69°48°-1°
- ThursdaySep 24Rain45%0.49″55°49°-14°
- FridaySep 25Light Drizzle47%0.02″66°46°+11°
- SaturdaySep 26Overcast——67°44°+1°
- SundaySep 27Drizzle22%0.08″67°49°0°
Air quality now AQI 57 · Moderate
AQI 57 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 14.2 µg/m³ (AQI 61) with a 0.98 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in stagnant air, not road dust.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 14.2 µg/m³ (AQI 61) with a 0.98 fine-to-coarse ratio and 1 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.98
- Wind
- calm
- Recent rain
- 0h in last 6h
- Pattern
- stagnant smoke
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- —
- Moonset
- 1:11 AM
- In sign
- ♑︎ Capricorn
Fog locks the valleys
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Olympia at a glance
- Today vs. normal: Today averages 61°F (high 73°F, low 48°F), 4°F above the 57°F normal for Sep 21
- Last frost: April 29 (1991–2020 median, NOAA station 8 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash
16-Day Forecast — Olympia
- Mon73°48°0%
- Tue70°53°2%
- Wed69°48°6%
- Thu55°49°45%
- Fri66°46°47%
- Sat67°44°4%
- Sun67°49°22%
- Mon67°48°8%
- Tue69°46°12%
- Wed69°45°16%
- Thu70°46°24%
- Fri68°44°30%
- Sat72°43°26%
- Sun73°43°13%
- Mon60°45°10%
- Tue64°44°19%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Olympia
Interactive wind and temperature map centered on Olympia — it loads in your browser. Open the full weather map.
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 14) is approaching. Pick what frost-tender plants still carry before the next cold front. This city's planting calendar for September: plant garlic (overwinter); harvest tomatoes, peppers, beans, and summer squash.
Sun & seasons in Olympia
Olympia sits in Thurston County, where the year’s longest day runs 15h 54m of daylight and its shortest just 8h 30m — a swing of +7h 24m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Seattle, the state’s largest city, lies about 48 miles to the NNE. The nearest town Olympia tracks is Tacoma, roughly 25 miles to the NE.
Air quality in Olympia
Air quality in Olympia’s county has trended dirtier since 2020; its cleanest year on record was 2021 (median AQI 19). See the full air-quality history for Olympia.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, garlic |
| August | — | beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
Olympia peaks at about 64°F in August and bottoms near 39°F in December; November brings the heaviest rain (8.2 inches) and July the least (0.5 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 40° | 7.8″ | 14 |
| February | 41° | 5.1″ | 11 |
| March | 44° | 5.7″ | 13 |
| April | 48° | 3.7″ | 10 |
| May | 55° | 2.3″ | 7 |
| June | 59° | 1.5″ | 4 |
| July | 64° | 0.5″ | 2 |
| August | 64° | 1.0″ | 2 |
| September | 59° | 2.0″ | 5 |
| October | 50° | 5.1″ | 10 |
| November | 43° | 8.2″ | 14 |
| December | 39° | 7.8″ | 14 |
Regional context
Similar climates Tumwater, WA, Lacey, WA, Tanglewilde, WA
Drawing on NOAA NCEI 1991-2020 normals, Olympia's January averages 40°F and July 64°F — 25°F apart — while precipitation totals roughly 50.6 inches over some 105 days.
Cool-season fronts carry Olympia's rain: November logs 8.2 inches on 14.3 days, against July's 0.5 inches on 1.7 — winter does the heavy lifting in Olympia. That cool-season-wet pattern aligns Olympia with places like Tumwater, WA, Lacey, WA and Tanglewilde, WA.
Olympia's growing window opens around April 29, once Olympia's overnight lows stop freezing — sow peas, lettuce, spinach, and radishes. In Olympia, warm-season transplants — tomatoes, peppers, basil — wait two weeks past Olympia's frost date. It shuts near October 14, when freezes return to Olympia and tender plants need cover. Sheltered Olympia yards can escape a light frost.
Similar climates: Tumwater, WA, Lacey, WA, Tanglewilde, WA, Nisqually Indian Community, WA, Anderson Island, WA.
Frequently asked
- When does it freeze in Olympia?
- Olympia's last spring frost lands near April 29, and in Olympia the first fall frost follows around October 14.
- What is the rainy season in Olympia?
- November is the wettest month in Olympia, about 8.2 inches on average; the year totals roughly 51 inches.
- What is the warmest month in Olympia?
- On average August tops the year in Olympia at about 64°F.
- What is the coldest month in Olympia?
- The coldest stretch in Olympia falls in December, around 39°F on average.
- When can I start a vegetable garden in Olympia?
- Around April 29, start frost-hardy crops in Olympia; tomatoes and basil belong a fortnight later.
- How many rainy days does Olympia get?
- Expect roughly 105 wet days a year in Olympia.
- What hardiness zone is Olympia?
- With December around 39°F, Olympia's zone reflects that minimum — the USDA ZIP map confirms Olympia's band.
- What is the 10-day forecast for Olympia?
- Olympia's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Olympia?
- See this week's day-by-day rain chances for Olympia in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Olympia?
- Current conditions for Olympia and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Olympia forecast updated?
- The Olympia forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Olympia?
- Today's sunrise and sunset times for Olympia are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Olympia?
- The next few days in Olympia's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Olympia sits at 47.0°N; its climate zone is warm-summer Mediterranean (Köppen approximation).
ZIP codes in Olympia
- 98501
- 98502
- 98504
- 98505
- 98506
- 98507
- 98508
- 98512
- 98513
- 98516