Shamrock Colony, South Dakota Weather
Thunder stills across the plains. Day 93 of summer. Read this microseason across nine climate regions →
Shamrock Colony weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:27 AM CDT · Open-Meteo
- TodaySep 21Drizzle89%0.56″58°51°—
- TuesdaySep 22Overcast——59°50°+1°
- WednesdaySep 23Drizzle41%—67°52°+8°
- ThursdaySep 24Light Drizzle41%0.02″60°58°-7°
- FridaySep 25Overcast34%—66°58°+6°
- SaturdaySep 26Light Drizzle34%—70°59°+4°
- SundaySep 27Overcast11%—71°50°+1°
Air quality now AQI 21 · Good
AQI 21 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
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
- 5:20 PM
- Moonset
- 1:37 AM
- In sign
- ♑︎ Capricorn
Thunder stills across the plains
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Shamrock Colony at a glance
- Today vs. normal: Today averages 55°F (high 58°F, low 51°F), 5°F below the 60°F normal for Sep 21
- Last frost: May 6 (1991–2020 median, NOAA station 32 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots
16-Day Forecast — Shamrock Colony
- Mon58°51°89%
- Tue59°50°8%
- Wed67°52°41%
- Thu60°58°41%
- Fri66°58°34%
- Sat70°59°34%
- Sun71°50°11%
- Mon64°56°41%
- Tue69°48°41%
- Wed64°47°7%
- Thu67°48°10%
- Fri63°53°19%
- Sat58°46°20%
- Sun57°39°24%
- Mon60°38°16%
- Tue62°51°13%
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 2) 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, winter squash, fall brassicas, and carrots.
SPC Convective Outlook
Storm Prediction Center — Shamrock Colony
SPC includes Shamrock Colony in the general thunderstorm area day after tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWNONENo severe risk
- DAY 3TSTMGeneral Thunderstorms
Thunderstorms possible. Not severe, but capable of producing lightning and brief heavy rain.
Source: NOAA / NWS Storm Prediction Center categorical convective outlook.
Sun & seasons in Shamrock Colony
Shamrock Colony sits in Beadle County, where the year’s longest day runs 15h 34m of daylight and its shortest just 8h 49m — a swing of +6h 45m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Sioux Falls, the state’s largest city, lies about 96 miles to the SE. The nearest town Shamrock Colony tracks is Spring Valley Colony, roughly 61 miles to the SW.
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 | beans, squash, fall brassicas, carrots | lettuce, peas, spinach, beans, summer squash, garlic |
| August | garlic (overwinter) | peas, tomatoes, peppers, beans, summer squash, garlic |
| September | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| October | — | fall brassicas, carrots |
A year in weather
Shamrock Colony's warmest month is July (~74°F mean) and its coldest is January (~16°F). Rainfall peaks in June (3.9 inches) and bottoms out in January (0.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 16° | 0.6″ | 6 |
| February | 21° | 0.8″ | 7 |
| March | 33° | 1.1″ | 7 |
| April | 46° | 2.5″ | 9 |
| May | 58° | 3.1″ | 11 |
| June | 68° | 3.9″ | 12 |
| July | 74° | 2.8″ | 9 |
| August | 71° | 2.6″ | 8 |
| September | 63° | 2.4″ | 7 |
| October | 48° | 1.9″ | 7 |
| November | 33° | 0.8″ | 5 |
| December | 21° | 0.7″ | 6 |
Regional context
Similar climates Hillside Colony, SD, Fordham Colony, SD, Clark Colony, SD
Shamrock Colony swings from 16°F in January to 74°F in July (58°F) per NOAA NCEI 1991-2020 normals; precipitation in Shamrock Colony runs about 23.3 inches on roughly 95 measurable days.
Summer convection drives Shamrock Colony's precipitation: June logs 3.9 inches on 11.6 rainy days, against January's 0.6 inches on 6.3 — warm-season storms carry Shamrock Colony's moisture. That summer-storm rhythm groups Shamrock Colony with places like Hillside Colony, SD, Fordham Colony, SD and Clark Colony, SD.
Shamrock Colony reaches its last hard frost near May 6; that is the cue for kale, peas, spinach, and parsnips. Heat-demanding starts go out a fortnight on in Shamrock Colony, after the soil warms and cold snaps clear. Frost returns to Shamrock Colony near October 2, ending the tender-crop season. That date is a median: Shamrock Colony freezes sooner in half of years.
Similar climates: Hillside Colony, SD, Fordham Colony, SD, Clark Colony, SD, Huron Colony, SD, Riverside Colony, SD.
Frequently asked
- When does it freeze in Shamrock Colony?
- In Shamrock Colony, expect the last spring frost near May 6; Shamrock Colony's first autumn frost comes around October 2.
- What is the rainy season in Shamrock Colony?
- Shamrock Colony sees its heaviest rain in June (around 3.9 inches), part of roughly 23 inches a year.
- What is the warmest month in Shamrock Colony?
- On average July tops the year in Shamrock Colony at about 74°F.
- What is the coldest month in Shamrock Colony?
- The coldest stretch in Shamrock Colony falls in January, around 16°F on average.
- When can I start a vegetable garden in Shamrock Colony?
- Hardy spring crops go in near May 6 in Shamrock Colony; tender peppers and squash wait 10–14 days.
- How many rainy days does Shamrock Colony get?
- Shamrock Colony records around 95 days of measurable precipitation annually.
- What hardiness zone is Shamrock Colony?
- Because Shamrock Colony bottoms near 16°F in January, that winter low sets Shamrock Colony's USDA zone — verify by ZIP.
- What is the 10-day forecast for Shamrock Colony?
- Shamrock Colony'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 Shamrock Colony?
- See this week's day-by-day rain chances for Shamrock Colony in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Shamrock Colony?
- Current conditions for Shamrock Colony and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Shamrock Colony forecast updated?
- The Shamrock Colony forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Shamrock Colony?
- Today's sunrise and sunset times for Shamrock Colony 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 Shamrock Colony?
- The next few days in Shamrock Colony's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Shamrock Colony sits at 44.6°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Shamrock Colony
- 57322