Hillsboro, North Dakota Weather
Thunder stills across the plains. Day 93 of summer. Read this microseason across nine climate regions →
Hillsboro weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 1:50 AM CDT · Open-Meteo
- TodaySep 21Overcast——66°46°—
- TuesdaySep 22Partly Cloudy——67°44°+1°
- WednesdaySep 23Drizzle68%—70°52°+3°
- ThursdaySep 24Light Drizzle68%—66°59°-4°
- FridaySep 25Light Drizzle19%—67°59°+1°
- SaturdaySep 26Light Drizzle27%—74°57°+7°
- SundaySep 27Overcast28%—71°49°-3°
Air quality now AQI 25 · Good
AQI 25 (Good), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points). PM2.5 at 5.5 µg/m³ (AQI 31) with a 0.95 fine-to-coarse ratio and 4 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 during the projected peak around 10 AM.
What's driving it
PM × Wind × Precip
PM2.5 at 5.5 µg/m³ (AQI 31) with a 0.95 fine-to-coarse ratio and 4 mph wind — combustion smoke trapped in stagnant air, not road dust.
- PM2.5/PM10
- 0.95
- 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
- 5:26 PM
- Moonset
- 1:21 AM
- In sign
- ♑︎ Capricorn
Thunder stills across the plains
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Hillsboro at a glance
- Today vs. normal: Today averages 56°F (high 66°F, low 46°F), 2°F below the 58°F normal for Sep 21
- Last frost: May 2 (1991–2020 median, NOAA station 4 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant garlic (overwinter); harvest tomatoes, peppers, beans, summer squash, winter squash
15-Day Forecast — Hillsboro
- Mon66°46°2%
- Tue67°44°1%
- Wed70°52°68%
- Thu66°59°68%
- Fri67°59°19%
- Sat74°57°27%
- Sun71°49°28%
- Mon75°58°35%
- Tue70°49°35%
- Wed77°51°14%
- Thu74°56°18%
- Fri79°58°19%
- Sat78°58°16%
- Sun66°44°26%
- Mon48°41°23%
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 9) 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 Hillsboro
Hillsboro sits in Traill County, where the year’s longest day runs 15h 57m of daylight and its shortest just 8h 27m — a swing of +7h 30m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Fargo, the state’s largest city, lies about 39 miles to the SSE. The nearest town Hillsboro tracks is Fargo, roughly 39 miles to the SSE.
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 | — | tomatoes, peppers, beans, summer 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
In Hillsboro, July runs warmest near 71°F and January coldest around 9°F, while June is the wettest month (3.6 inches) and January the driest (0.6 inches).
| Month | Mean temp | Precip | Rainy days |
|---|---|---|---|
| January | 9° | 0.6″ | 7 |
| February | 13° | 0.6″ | 5 |
| March | 28° | 1.2″ | 5 |
| April | 43° | 1.4″ | 6 |
| May | 57° | 2.8″ | 10 |
| June | 67° | 3.6″ | 11 |
| July | 71° | 3.4″ | 9 |
| August | 69° | 2.6″ | 8 |
| September | 61° | 2.2″ | 7 |
| October | 46° | 2.2″ | 7 |
| November | 30° | 0.9″ | 5 |
| December | 17° | 0.9″ | 6 |
Regional context
Similar climates Blanchard, ND, Caledonia, ND, Grandin, ND
In Hillsboro, NOAA NCEI 1991-2020 normals put January near 9°F and July near 71°F — a 62°F seasonal arc — with about 22.3 inches of precipitation over 85 rainy or snowy days.
Hillsboro's rain peaks in summer: June brings 3.6 inches over 10.5 thunderstorm-fed days, while January sees just 0.6 inches across 6.5 days under cooler, drier air. That summer-storm rhythm groups Hillsboro with places like Blanchard, ND, Caledonia, ND and Grandin, ND.
Once Hillsboro passes May 2, freezes fade and Hillsboro's beds take kale, peas, spinach, and parsnips. Tomatoes and peppers do best set out two weeks later in Hillsboro, once nights clear the mid-40s°F. Frost returns to Hillsboro near October 9, ending the tender-crop season. That date is a median: Hillsboro freezes sooner in half of years.
Similar climates: Blanchard, ND, Caledonia, ND, Grandin, ND, Buxton, ND, Mayville, ND.
Frequently asked
- When does it freeze in Hillsboro?
- Frost typically leaves Hillsboro by May 2 and returns to Hillsboro near October 9.
- What is the rainy season in Hillsboro?
- June is the wettest month in Hillsboro, about 3.6 inches on average; the year totals roughly 22 inches.
- What is the warmest month in Hillsboro?
- The warmest stretch in Hillsboro comes in July, around 71°F on average.
- What is the coldest month in Hillsboro?
- On average January is the chilliest month in Hillsboro, about 9°F.
- When can I start a vegetable garden in Hillsboro?
- Time tomatoes in Hillsboro for two weeks after May 2; peas and greens start at Hillsboro's frost line.
- How many rainy days does Hillsboro get?
- Expect roughly 85 wet days a year in Hillsboro.
- What hardiness zone is Hillsboro?
- Hillsboro's hardiness zone tracks its winter low; with January near 9°F, check the USDA ZIP map for the exact zone.
- What is the 10-day forecast for Hillsboro?
- Hillsboro'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 Hillsboro?
- See this week's day-by-day rain chances for Hillsboro in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Hillsboro?
- Current conditions for Hillsboro and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Hillsboro forecast updated?
- The Hillsboro forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Hillsboro?
- Today's sunrise and sunset times for Hillsboro 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 Hillsboro?
- The next few days in Hillsboro's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Hillsboro sits at 47.4°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Hillsboro
- 58045