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First Lake, MT Weather Forecast

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Mist

38°F

Updated	6:03 am
Feels Like	30°F
Humidity	96%
Wind	W 3 mph
Barometer	30.02 in
Dew Point	37°F

Mist

3°C

Updated	6:03 am
Feels Like	-1°C
Humidity	96%
Wind	W 5 km/h
Barometer	101.6 kPa
Dew Point	3°C

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Cloud Cover	47%
Wind Chill	36°F 2°C
Sunrise	8:19 AM
Sunset	6:21 PM
Moonrise	11:24 PM
Moonset	2:41 PM

Civil Twilight
7:43 AM to 8:15 AM
6:20 PM to 6:52 PM
First Lake MT Weather - Waning Gibbous Moon

Waning Gibbous Moon

First Lake Weather Forecast

TODAY	TONIGHT	SUNDAY	SUNDAY NIGHT	MONDAY	MONDAY NIGHT	TUESDAY	TUESDAY NIGHT	WEDNESDAY	WEDNESDAY NIGHT	THURSDAY	THURSDAY NIGHT

Patchy Fog	Patchy Fog	Rain and Snow	Rain and Snow	Clearing	Mostly Clear	Mostly Cloudy	Partly Cloudy	Partly Cloudy	Partly Cloudy	Chance of Snow	Chance of Snow
Hi: 46°FHi: 8°C	Lo: 35°FLo: 2°C	Hi: 40°FHi: 4°C	Lo: 26°FLo: -3°C	Hi: 45°FHi: 7°C	Lo: 26°FLo: -3°C	Hi: 46°FHi: 8°C	Lo: 30°FLo: -1°C	Hi: 46°FHi: 8°C	Lo: 26°FLo: -3°C	Hi: 46°FHi: 8°C	Lo: 26°FLo: -3°C
		POP: 70%	POP: 30%							POP: 20%	POP: 20%

POP = Probability of Precipitation.

Weather Outlook Updated: 1229 AM MDT Sat Oct 31 2026 First Lake, MT Weather - WeatherWorld.com

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Meteorlogic Glosserator
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Issued: 318 AM MDT Sat Oct 31 2026

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KEY MESSAGES:

Valley rain and mountain snow Sunday into Monday morning, focused along and south of I-90. Northwest Montana stays mostly dry.
High pressure bringing stable conditions and valley fog next week.
Late Week Shift: A return to unsettled pattern and potential for mountain snow by next weekend.

Low pressure continues to spin in place over the Pacific Northwest this morning. This feature brought sporadic showers to the region yesterday and due to the breaks in clouds, some loc...

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Weather 101: Term of the Day

SWEAT

Severe Weather Threat Index (SWEAT). A stability index developed by the U.S. Air Force which incorporates instability, wind shear, and wind speeds. It is computed as: SWEAT = (12 * Td850) + (20 * (TT - 49)) + (2 * f850) + f500 + (125 * (s + 0.2)) where Td850 is the dew point temperature at 850 mb, TT is the Total Totals Index, f850 is the 850-mb wind speed (in knots), f500 is the 500-mb wind speed (in knots), and s is the sine of the angle between the wind directions at 500 mb and 850 mb (representing directional shear in this layer). SWEAT values of about 250-300 or more indicate a greater potential for severe weather, but as with all stability indices, there are no magic numbers. The SWEAT index uses only mandatory-level sounding data (500 mb and 850 mb), which is both an advantage and a disadvantage. It has fallen into relative disuse with the advent of more detailed upper-air sounding analysis programs.