Lewis and Clark County, MT Weather Forecast
County weather hub
Showers And Thunderstorms
Compare major city weather across Lewis and Clark County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Showers and thunderstorms after 2pm. Cloudy. High near 75, with temperatures falling to around 69 in the afternoon. East southeast wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 80%.
County Weather Overview
This county weather page brings together forecast coverage for Lewis and Clark County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 1 of 1 mapped cities in Lewis and Clark County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- May 26 to Jun 1, 2026
- Latest sync
- May 26, 2026 3:50 PM MDT
- Forecast office
- TFX
- Source
- NOAA / NWS
Daily Outlook
This Week in Lewis and Clark County
Thursday looks like the warmest upcoming period in Lewis and Clark County at 78 degrees F.
Sunday Night is the coolest period ahead with temperatures near 39 degrees F.
The strongest winds are forecast for Saturday Night at about 9 to 15 mph W.
Precipitation is mentioned in 14 upcoming forecast periods.
Forecast Details
- Last updated
- May 26, 2026 3:50 PM MDT
- Coverage
- 8 days
- Time zone
- America/Denver
- Forecast office
- TFX
- Radar station
- KTFX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely before 10pm, then a chance of showers and thunderstorms between 10pm and 2am. Mostly cloudy. Low around 48, with temperatures rising to around 51 overnight. West southwest wind around 7 mph. Chance of precipitation is 70%.
A slight chance of rain showers between 11am and noon, then a slight chance of showers and thunderstorms between noon and 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then a chance of showers and thunderstorms. Partly sunny, with a high near 73. Northeast wind around 7 mph. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 50. North wind around 6 mph. Chance of precipitation is 50%.
A slight chance of showers and thunderstorms after noon. Mostly sunny, with a high near 78. Northeast wind 3 to 7 mph. Chance of precipitation is 20%.
A chance of showers and thunderstorms before midnight. Partly cloudy, with a low around 52. North wind 5 to 8 mph. Chance of precipitation is 40%.
A chance of showers and thunderstorms after noon. Mostly sunny, with a high near 77. West southwest wind around 6 mph.
Showers and thunderstorms likely. Mostly cloudy, with a low around 47. Southwest wind around 9 mph.
Rain likely before noon, then showers and thunderstorms. Mostly cloudy, with a high near 59.
Showers and thunderstorms before midnight, then rain likely. Mostly cloudy, with a low around 41.
Rain likely before noon, then a chance of showers and thunderstorms. Partly sunny, with a high near 55.
A chance of showers and thunderstorms before midnight, then a chance of rain. Mostly cloudy, with a low around 39.
A chance of rain before noon, then a chance of showers and thunderstorms. Partly sunny, with a high near 58.
A slight chance of rain before midnight. Partly cloudy, with a low around 40.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
This Afternoon
May 26
|
Showers And Thunderstorms
|
75°F |
9 mph
ESE
|
|
Tonight
May 26
|
Showers And Thunderstorms Likely then Chance Showers And Thunderstorms
|
48°F |
7 mph
WSW
|
|
Wednesday
May 27
|
Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms
|
73°F |
7 mph
NE
|
|
Wednesday Night
May 27
|
Chance Showers And Thunderstorms then Partly Cloudy
|
50°F |
6 mph
N
|
|
Thursday
May 28
|
Mostly Sunny then Slight Chance Showers And Thunderstorms
|
78°F |
3 to 7 mph
NE
|
|
Thursday Night
May 28
|
Chance Showers And Thunderstorms then Partly Cloudy
|
52°F |
5 to 8 mph
N
|
|
Friday
May 29
|
Mostly Sunny then Chance Showers And Thunderstorms
|
77°F |
6 mph
WSW
|
|
Friday Night
May 29
|
Showers And Thunderstorms Likely
|
47°F |
9 mph
SW
|
|
Saturday
May 30
|
Light Rain Likely then Showers And Thunderstorms
|
59°F |
8 mph
W
|
|
Saturday Night
May 30
|
Showers And Thunderstorms then Light Rain Likely
|
41°F |
9 to 15 mph
W
|
|
Sunday
May 31
|
Light Rain Likely then Chance Showers And Thunderstorms
|
55°F |
13 mph
WSW
|
|
Sunday Night
May 31
|
Chance Showers And Thunderstorms then Chance Light Rain
|
39°F |
9 mph
W
|
|
Monday
Jun 1
|
Chance Light Rain then Chance Showers And Thunderstorms
|
58°F |
9 mph
WNW
|
|
Monday Night
Jun 1
|
Slight Chance Light Rain then Partly Cloudy
|
40°F |
6 to 9 mph
NNW
|
Major City Forecasts
Live forecast snapshots for major cities across Lewis and Clark County.
Coverage
Forecast coverage currently spans 1 of 1 mapped cities in Lewis and Clark County.
Largest mapped city population in this region: 33,737.
