Mammoth, Montana Weather
Thunderheads build by noon. Day 89 of spring. Read this microseason across nine climate regions →
Mammoth weather forecast — hour by hour, 7-day outlook, NOAA radar
- TodayJun 16Overcast——79°56°—
- WednesdayJun 17Mostly Clear——64°49°-15°
- ThursdayJun 18Overcast——74°41°+10°
- FridayJun 19Overcast——77°43°+3°
- SaturdayJun 20Light Drizzle60%0.01″73°53°-4°
- SundayJun 21Light Drizzle60%0.02″64°45°-9°
- MondayJun 22Overcast21%—75°41°+11°
AQI 25 (Good), driven by Ozone. AQI down 9 over the last 6 hours (gradual decline). Ozone at AQI 41 now. With UV 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 39 around 1 PM.
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion during the projected peak around 10 PM.
What's driving it
Ozone × UV × Sky
Ozone at AQI 41 now. With UV 7.2 peaking around 1 PM under clear skies, surface ozone likely climbs to AQI 39 around 1 PM.
- Present
- AQI 41
- UV peak
- 7.2 at 1 PM
- Sky at peak
- clear
- Projected peak
- AQI 39
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).
Cut your thistles before St. John, you will have two instead of one.
- Moonrise
- 6:51 AM
- Moonset
- 10:46 PM
- In sign
- ♋︎ Cancer
Thunderheads build by noon
Mammoth at a glance
- Today vs. normal: 71°F — typical for the season
- Last frost: May 20 (climatological average for this latitude)
- Microseason: Jun 16–20
- Planting window: Stake and prune tomato suckers. Watch for squash vine borers.
16-Day Forecast — Mammoth
- Tue79°56°2%
- Wed64°49°2%
- Thu74°41°0%
- Fri77°43°1%
- Sat73°53°60%
- Sun64°45°60%
- Mon75°41°21%
- Tue82°53°8%
- Wed83°53°14%
- Thu78°53°14%
- Fri77°53°15%
- Sat66°46°15%
- Sun69°39°16%
- Mon51°42°25%
- Tue67°42°26%
- Wed69°46°23%
Forecast data from Open-Meteo (CC BY 4.0).
Right now in the garden
Warm-season window is open
As of June 16, the last spring frost has passed for most years. Transplant tomatoes, peppers, eggplants, basil, and cucurbits (cucumbers, squash, melons) now. Direct-sow beans and corn into warm soil.
ZIP codes in Mammoth
- 59747
- 59721