Westby, Montana Weather
Monsoon storms drench the south. Day 14 of summer. Read this microseason across nine climate regions →
Westby weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJul 4Light Drizzle44%—84°58°—
- SundayJul 5Overcast16%—88°61°+4°
- MondayJul 6Overcast20%—80°65°-8°
- TuesdayJul 7Light Drizzle52%0.02″70°59°-10°
- WednesdayJul 8Overcast42%—79°54°+9°
- ThursdayJul 9Overcast23%—86°63°+7°
- FridayJul 10Clear23%—79°57°-7°
AQI 38 (Good), driven by PM2.5. AQI down 10 over the last 6 hours (gradual decline). PM2.5 at 7.0 µg/m³, PM10 at 8.3 µg/m³ — typical background levels with no transport signature.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
What's driving it
PM × Wind × Precip
PM2.5 at 7.0 µg/m³, PM10 at 8.3 µg/m³ — typical background levels with no transport signature.
- PM2.5/PM10
- 0.84
- Wind
- light
- Recent rain
- 0h in last 6h
- Pattern
- background
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
- 11:06 PM
- Moonset
- 9:54 AM
- In sign
- ♓︎ Pisces
Monsoon storms drench the south
Westby at a glance
- Today vs. normal: 61°F — typical for the season
- Last frost: June 8 (climatological average for this latitude)
- Microseason: Jul 1–5
- Planting window: Harvest early potatoes. Begin drying onions on the surface.
ZIP code: 59275
15-Day Forecast — Westby
- Sat84°58°44%
- Sun88°61°16%
- Mon80°65°20%
- Tue70°59°52%
- Wed79°54°42%
- Thu86°63°23%
- Fri79°57°23%
- Sat84°54°13%
- Sun81°65°10%
- Mon78°59°8%
- Tue88°58°19%
- Wed96°64°10%
- Thu84°67°10%
- Fri87°60°6%
- Sat104°67°9%
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 — Westby
SPC includes Westby in the general thunderstorm area today — no severe risk, but storms are possible.
- TODAYTSTMGeneral Thunderstorms
- 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 Westby
- 59275