Stillwater, Minnesota Weather
Thunder stills across the plains. Day 93 of summer. Read this microseason across nine climate regions →
Stillwater weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 12:20 AM CDT · Open-Meteo
- TodaySep 21Overcast——62°46°—
- TuesdaySep 22Overcast——63°48°+1°
- WednesdaySep 23Overcast——68°43°+5°
- ThursdaySep 24Heavy Drizzle30%0.08″63°53°-5°
- FridaySep 25Drizzle—0.12″65°53°+2°
- SaturdaySep 26Drizzle23%0.13″63°56°-2°
- SundaySep 27Overcast19%—69°60°+6°
Air quality now AQI 28 · Good
AQI 28 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 5.0 µg/m³, PM10 at 5.1 µg/m³ — typical background levels with no transport signature.
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 5.0 µg/m³, PM10 at 5.1 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.98
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 5:00 PM
- Moonset
- 1:14 AM
- In sign
- ♑︎ Capricorn
Thunder stills across the plains
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Stillwater at a glance
- Today vs. normal: Today averages 54°F (high 62°F, low 46°F), 9°F below the 63°F normal for Sep 21
- Last frost: April 30 (1991–2020 median, NOAA station 2 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Stillwater
- Mon62°46°5%
- Tue63°48°3%
- Wed68°43°0%
- Thu63°53°30%
- Fri65°53°5%
- Sat63°56°23%
- Sun69°60°19%
- Mon76°62°27%
- Tue77°59°39%
- Wed69°53°28%
- Thu68°47°25%
- Fri71°54°30%
- Sat71°47°16%
- Sun61°39°23%
- Mon53°35°19%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Fall planting + final harvests
As of September 21, the season's first frost (typically October 11) 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, summer squash, and winter squash.
Sun & seasons in Stillwater
Stillwater sits in Washington County, where the year’s longest day runs 15h 37m of daylight and its shortest just 8h 45m — a swing of +6h 52m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Minneapolis, the state’s largest city, lies about 22 miles to the WSW. The nearest town Stillwater tracks is St. Paul, roughly 15 miles to the WSW.
Air quality in Stillwater
Air quality in Stillwater’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 33).
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| April | lettuce, peas, spinach, radishes | — |
| May | lettuce, peas, spinach, radishes, tomatoes, peppers, beans, squash | lettuce, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| July | tomatoes, peppers, beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | — | tomatoes, peppers, beans, summer squash, winter squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| October | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| November | — | fall brassicas, carrots |
A year in weather
Stillwater peaks at about 75°F in July and bottoms near 18°F in January; June brings the heaviest rain (5.4 inches) and February the least (0.9 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 18° | 1.0″ | 8 |
| February | 23° | 0.9″ | 6 |
| March | 35° | 1.5″ | 8 |
| April | 49° | 3.1″ | 10 |
| May | 61° | 4.2″ | 12 |
| June | 71° | 5.4″ | 13 |
| July | 75° | 4.5″ | 11 |
| August | 73° | 5.3″ | 9 |
| September | 65° | 3.2″ | 9 |
| October | 52° | 3.2″ | 9 |
| November | 37° | 1.6″ | 7 |
| December | 24° | 1.1″ | 8 |
Regional context
Similar climates Oak Park Heights, MN, Bayport, MN, Grant, MN
By the nearest station's NOAA NCEI 1991-2020 normals, Stillwater sees 18°F Januarys and 75°F Julys, a 57°F range, plus around 35.1 inches of precipitation across 111 days.
Precipitation in Stillwater runs summer-dominant: June averages 5.4 inches across 12.9 days of warm-season storms, while February drops to 0.9 inches over 6.2 rainy days of drier cool air. That summer-storm rhythm groups Stillwater with places like Oak Park Heights, MN, Bayport, MN and Grant, MN.
The cool-season window in Stillwater starts at April 30, when nights stop freezing — think kale, peas, spinach, and parsnips. Hold Stillwater's tender crops — tomatoes, peppers, basil — until 10-14 days past Stillwater's last frost. It shuts near October 11, when freezes return to Stillwater and tender plants need cover. Sheltered Stillwater yards can escape a light frost.
Similar climates: Oak Park Heights, MN, Bayport, MN, Grant, MN, Lake Elmo, MN, Willernie, MN.
Frequently asked
- When does it freeze in Stillwater?
- Stillwater's last spring frost lands near April 30, and in Stillwater the first fall frost follows around October 11.
- What is the rainy season in Stillwater?
- Rainfall in Stillwater peaks in June near 5.4 inches, out of about 35 inches annually.
- What is the warmest month in Stillwater?
- July is Stillwater's warmest month, averaging about 75°F.
- What is the coldest month in Stillwater?
- Stillwater bottoms out in January, with a mean near 18°F.
- When can I start a vegetable garden in Stillwater?
- Stillwater's last frost (April 30) cues hardy greens; in Stillwater, hold heat-lovers two weeks past.
- How many rainy days does Stillwater get?
- Stillwater records around 111 days of measurable precipitation annually.
- What hardiness zone is Stillwater?
- Stillwater's hardiness zone tracks its winter low; with January near 18°F, check the USDA ZIP map for the exact zone.
- What is the 10-day forecast for Stillwater?
- Stillwater'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 Stillwater?
- See this week's day-by-day rain chances for Stillwater in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Stillwater?
- Current conditions for Stillwater and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Stillwater forecast updated?
- The Stillwater forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Stillwater?
- Today's sunrise and sunset times for Stillwater 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 Stillwater?
- The next few days in Stillwater's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Stillwater sits at 45.1°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Stillwater
- 55082
- 55083