Groton, Aberdeen Weather
Groton weather this week
Over the next 7 days in Groton, daytime highs range from 6°C to 14°C and night-time lows from -5°C to 8°C. The warmest afternoon is likely on Wednesday at 14°C, while the coolest night is expected tonight at -5°C. Temperatures stay fairly steady through the week. Expect a wide gap of around 14°C between afternoon and early-morning temperatures, so mornings will feel noticeably cooler.
Rain is most likely Friday.
It turns breezy on Wednesday, with winds reaching about 36 km/h — secure loose objects on rooftops and balconies. UV levels stay moderate or lower, peaking at 3. Average humidity is a comfortable 72% or so.
| Day | Conditions | High / Low | Rain chance | Rain | Max wind |
|---|---|---|---|---|---|
| Today (Saturday) | Overcast | 8° / -5° | 0% | 0.0 mm | 29 km/h |
| Tomorrow (Sunday) | Clear sky | 11° / 1° | 1% | 0.0 mm | 29 km/h |
| Monday | Overcast | 13° / 2° | 1% | 0.0 mm | 23 km/h |
| Tuesday | Overcast | 13° / 8° | 1% | 0.0 mm | 34 km/h |
| Wednesday | Overcast | 14° / 7° | 18% | 0.0 mm | 36 km/h |
| Thursday | Overcast | 8° / 3° | 18% | 0.0 mm | 34 km/h |
| Friday | Overcast | 6° / 3° | 52% | 0.0 mm | 19 km/h |
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Today's outlook for Groton
At 20:15 local time it is 4°C in Groton under clear skies, feeling like -2°C. Today's forecast high is 8°C and the low is -5°C, and the day overall looks overcast. Rain is unlikely today (0% chance). Winds are blowing at about 21 km/h from the south. Humidity is 62%.
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Climate of Groton: monthly averages
Based on 25 years of satellite and reanalysis data (2001-2025), July is usually the hottest month in Groton, with average daytime highs around 31°C. January is the coolest, when nights typically fall to about -14°C and frost is possible on the coldest nights. That is a wide yearly range of roughly 45°C, so the seasons feel very different from each other.
The area receives about 570 mm of rain in a typical year. Rainfall is modest in every month; June is the wettest at about 97 mm. The driest stretch is November to February, with under 20 mm a month.
For outdoor plans and travel, May to September usually offer the most comfortable weather in Groton, with mild days and relatively little rain.
| Month | Avg high | Avg low | Rainfall | Humidity |
|---|---|---|---|---|
| Jan | -4° | -14° | 11 mm | 85% |
| Feb | -2° | -13° | 16 mm | 79% |
| Mar | 6° | -6° | 26 mm | 71% |
| Apr | 14° | 0° | 51 mm | 63% |
| May | 21° | 7° | 83 mm | 62% |
| Jun | 27° | 14° | 97 mm | 63% |
| Jul | 31° | 18° | 75 mm | 57% |
| Aug | 29° | 16° | 67 mm | 59% |
| Sep | 24° | 10° | 60 mm | 61% |
| Oct | 14° | 2° | 49 mm | 67% |
| Nov | 5° | -5° | 15 mm | 74% |
| Dec | -3° | -11° | 19 mm | 84% |
Source: NASA POWER (MERRA-2 reanalysis), averaged over the roughly 50 km grid area around Groton. Values describe typical conditions, not a forecast.
About Groton weather
Groton, in South Dakota's continental climate, with sharp seasonal extremes typical of the northern Great Plains, is positioned about 255 km north-west of Sioux Falls. The warmer months mean warm-to-hot summers (June–August) with highs in the high 20s to low 30s°C. Finally, there's cold, windy winters (December–February) with significant snow. This page shows live, auto-refreshing weather for Groton: current conditions, an hourly breakdown, a 16-day outlook, a date-lookup tool for any past or future date, and real-time air quality, sourced from Open-Meteo. Local timezone: America/Chicago.
Frequently asked questions
Groton is about 255 km north-west of Sioux Falls, in South Dakota.
Groton sees cold, windy winters (December–February) with significant snow.
The live current conditions, hourly forecast and 16-day outlook above are pulled in real time for Groton's exact coordinates. No fixed schedule, the page updates whenever you load it.
July is usually the hottest month in Groton, with average daytime highs of about 31°C and nights around 18°C.
The coldest nights come in January, when the average low is about -14°C and daytime highs reach around -4°C. Frost is possible on clear, calm nights.
Groton receives about 570 mm of rain in a typical year. June is the wettest month at roughly 97 mm; no month averages more than 100 mm.
May to September usually offer the most comfortable weather in Groton, with mild daytime temperatures and little rain.
In November Groton typically sees daytime highs near 5°C and lows near -5°C, with about 15 mm of rain over the month and average humidity around 74%. Check the live forecast above for this week's actual conditions.
Up to 16 days ahead using the extended forecast and date picker above; further-out or historical dates use the same date lookup tool.
The current temperature for Groton updates automatically at the top of this page — scroll to the hourly strip below to see how it's expected to change over the day.
Groton's day-to-day weather follows the broader pattern of South Dakota described above. See the hourly weather forecast or the air quality index for more detail.