Lewistown, Montana Weather
Monsoon storms drench the south. Day 15 of summer. Read this microseason across nine climate regions →
Lewistown weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Overcast——85°48°—
- SundayJul 5Heavy Drizzle40%0.07″86°58°+1°
- MondayJul 6Drizzle49%—75°55°-11°
- TuesdayJul 7Drizzle56%—79°57°+4°
- WednesdayJul 8Heavy Rain44%0.80″87°57°+8°
- ThursdayJul 9Clear44%—75°52°-12°
- FridayJul 10Clear——84°53°+9°
AQI 43 (Good), driven by Ozone. AQI up 18 in the last 6 hours — air quality is degrading. Ozone at AQI 49 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
Ozone × UV × Sky
Ozone at AQI 49 — peak already passed at 1 PM under partly cloudy skies. Levels should ease through evening.
- Present
- AQI 49
- UV peak
- 1.5 at earlier today
- Sky at peak
- partly cloudy
- Projected peak
- AQI 49
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
- 11:42 PM
- Moonset
- 11:31 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Lewistown at a glance
- Today vs. normal: 20°F above 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
16-Day Forecast — Lewistown
- Sat86°48°1%
- Sun86°59°40%
- Mon75°55°49%
- Tue79°57°56%
- Wed87°57°44%
- Thu75°52°44%
- Fri84°53°4%
- Sat95°59°5%
- Sun95°65°5%
- Mon96°66°10%
- Tue100°67°19%
- Wed99°69°19%
- Thu91°64°19%
- Fri92°57°13%
- Sat93°64°10%
- Sun90°58°25%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Peak growing season
As of July 5, 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 has placed Lewistown in the Marginal Risk category for severe thunderstorms tomorrow.
- TODAYNONENo severe risk
- TOMORROWMRGLMarginal Risk
- DAY 3TSTMGeneral Thunderstorms
Isolated severe storms possible. Limited threat for hail or damaging wind.
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