Lewistown, Montana Weather
Monsoon storms drench the south. Day 14 of summer. Read this microseason across nine climate regions →
Lewistown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——83°53°—
- SundayJul 5Drizzle36%0.03″85°61°+2°
- MondayJul 6Light Showers41%—80°58°-5°
- TuesdayJul 7Thunderstorm46%0.01″74°58°-6°
- WednesdayJul 8Light Drizzle31%—89°56°+15°
- ThursdayJul 9Partly Cloudy31%—81°59°-8°
- FridayJul 10Clear13%—80°53°-1°
AQI 26 (Good), driven by PM2.5. AQI down 15 over the last 6 hours — air quality is improving sharply.
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).
If the first of July be rainy weather, 'twill rain more or less for four weeks together.
- Moonrise
- 11:25 PM
- Moonset
- 10:18 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Lewistown at a glance
- Today vs. normal: 9°F below the seasonal normal for this latitude
- Last frost: May 28 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 59457
15-Day Forecast — Lewistown
- Sat83°53°3%
- Sun85°61°36%
- Mon80°58°41%
- Tue74°58°46%
- Wed89°56°31%
- Thu81°59°31%
- Fri80°53°13%
- Sat94°56°9%
- Sun79°60°9%
- Mon84°54°12%
- Tue94°60°17%
- Wed99°65°18%
- Thu90°66°20%
- Fri97°63°16%
- Sat99°65°24%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 4, the growing season is at its peak — frost is months away. Continue succession-planting beans and summer squash. Start fall brassicas (broccoli, cabbage, kale) from seed indoors for transplanting in late summer.
SPC Convective Outlook
Storm Prediction Center — Lewistown
SPC includes Lewistown in the general thunderstorm area tomorrow — no severe risk, but storms are possible.
- TODAYNONENo severe risk
- TOMORROWTSTMGeneral Thunderstorms
- 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. Outlooks are re-issued multiple times per day; this page reflects the most recent SPC polygons covering the city’s coordinates.
ZIP codes in Lewistown
- 59457