Boulder River (Central MT) near Boulder
8.5 mi- Level
- 5.4 ft
- Flow
- 95 cfs
Reading from Sun 12:15 PM · NWS gauge page
Appearance
Ends in 21 h 45 min
Issued for this forecast zone · National Weather Service Great Falls MT
What
Variable visibility down to a quarter mile or less in dense fog.
Impacts
Low visibility could make driving conditions hazardous. Frost deposition may cause roads to become slippery, especially over bridges.
Additional details
Patchy fog is expected to become more widespread and dense tonight into Monday morning.
Precautionary actions
If driving, slow down, use your headlights, and leave plenty of distance ahead of you.
Areas: Elkhorn and Boulder Mountains; Canyon Ferry Area; Missouri Headwaters; Madison River Valley; Gallatin Valley; Northwest Beaverhead County; Beaverhead and Western Madison below 6000ft; Gallatin and Madison County Mountains and Centennial Mountains
See it on weather.gov (opens in a new tab)Model estimate for 2:00 PM MDT (no recent station report)
Mostly sunny and 31°−1°, 18°10° colder than usual, freeze watch tonight, low 26°−3°.
Today: low 26°−3° (likely 20°−7° to 26°−3°), high 35°2° (likely 35°2° to 38°3°).
Now 31°−1°
Mostly sunny · Feels like 27°−3°
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sun 2p | Mostly sunny | 31°−1° (likely 31°−1° to 38°3°) | 27°−3° | 0% | 5 mph8 km/h from SE, gusts 16 mph27 km/h | 85% | 16% | 3 |
| Sun 3p | Sunny | 33°1° (likely 33°1° to 38°3°) | 28°−2° | 0% | 6 mph10 km/h from SE, gusts 18 mph29 km/h | 85% | 27% | 2 |
| Sun 4p | Mostly sunny | 31°−1° (likely 31°−1° to 38°3°) | 27°−3° | 0% | 3 mph5 km/h from SE, gusts 17 mph28 km/h | 84% | 13% | 1 |
| Sun 5p | Sunny | 30°−1° (likely 30°−1° to 37°3°) | 26°−3° | 0% | 3 mph5 km/h from SE, gusts 17 mph28 km/h | 84% | 6% | 1 |
| Sun 6p | Clear | 32°0° (likely 30°−1° to 34°1°) | 32°0° | 0% | 2 mph3 km/h from ESE, gusts 16 mph26 km/h | 80% | 8% | 1 |
| Sun 7p | Clear | 27°−3° (likely 27°−3° to 32°0°) | 27°−3° | 0% | 2 mph3 km/h from ESE, gusts 16 mph25 km/h | 84% | 38% | 0 |
| Sun 8p | Clear | 26°−3° (likely 25°−4° to 31°−1°) | 22°−6° | 0% | 3 mph5 km/h from ESE, gusts 15 mph24 km/h | 84% | 15% | 0 |
| Sun 9p | Partly cloudy | 27°−3° (likely 24°−4° to 31°−1°) | 23°−5° | 0% | 3 mph5 km/h from SE, gusts 15 mph24 km/h | 84% | 29% | 0 |
| Sun 10p | Partly cloudy | 27°−3° (likely 23°−5° to 31°−1°) | 23°−5° | 0% | 3 mph5 km/h from SE, gusts 15 mph24 km/h | 84% | 53% | 0 |
| Sun 11p | Mostly cloudy | 27°−3° (likely 23°−5° to 30°−1°) | 23°−5° | 0% | 3 mph5 km/h from SE, gusts 15 mph24 km/h | 84% | 63% | 0 |
| Mon 12a | Cloudy | 27°−3° (likely 23°−5° to 30°−1°) | 22°−6° | 0% | 5 mph8 km/h from SE, gusts 15 mph25 km/h | 82% | 69% | 0 |
| Mon 1a | Partly cloudy | 28°−2° (likely 23°−5° to 30°−1°) | 22°−6° | 0% | 6 mph10 km/h from SE, gusts 15 mph24 km/h | 76% | 74% | 0 |
| Mon 2a | Partly cloudy | 28°−2° (likely 24°−4° to 31°−1°) | 22°−6° | 0% | 6 mph10 km/h from SE, gusts 14 mph23 km/h | 75% | 64% | 0 |
| Mon 3a | Partly cloudy | 28°−2° (likely 24°−4° to 31°−1°) | 22°−6° | 0% | 6 mph10 km/h from SE, gusts 13 mph21 km/h | 73% | 60% | 0 |
| Mon 4a | Partly cloudy | 28°−2° (likely 24°−4° to 31°−1°) | 21°−6° | 0% | 7 mph11 km/h from SE, gusts 13 mph20 km/h | 75% | 67% | 0 |
| Mon 5a | Cloudy | 29°−2° (likely 24°−4° to 31°−1°) | 22°−6° | 0% | 7 mph11 km/h from SE, gusts 12 mph19 km/h | 75% | 74% | 0 |
| Mon 6a | Cloudy | 27°−3° (likely 24°−4° to 31°−1°) | 20°−7° | 0% | 7 mph11 km/h from SE, gusts 12 mph19 km/h | 75% | 76% | 0 |
| Mon 7a | Cloudy | 29°−2° (likely 24°−4° to 31°−1°) | 22°−6° | 0% | 7 mph11 km/h from SE, gusts 12 mph20 km/h | 75% | 78% | 0 |
| Mon 8a | Cloudy | 29°−2° (likely 25°−4° to 31°−1°) | 23°−5° | 0% | 7 mph11 km/h from SE, gusts 13 mph21 km/h | 75% | 79% | 0 |
| Mon 9a | Cloudy | 29°−2° (likely 26°−3° to 32°0°) | 22°−6° | 0% | 7 mph11 km/h from SE, gusts 14 mph23 km/h | 67% | 79% | 0 |
| Mon 10a | Cloudy | 33°1° (likely 30°−1° to 34°1°) | 27°−3° | 0% | 7 mph11 km/h from SSE, gusts 13 mph21 km/h | 69% | 89% | 1 |
| Mon 11a | Cloudy | 36°2° (likely 34°1° to 38°3°) | 30°−1° | 0% | 7 mph11 km/h from SSE, gusts 15 mph24 km/h | 70% | 87% | 2 |
| Mon 12p | Cloudy | 39°4° (likely 37°3° to 39°4°) | 34°1° | 0% | 7 mph11 km/h from SSE, gusts 18 mph29 km/h | 68% | 68% | 2 |
| Mon 1p | Mostly cloudy | 42°6° (likely 39°4° to 42°6°) | 37°3° | 0% | 8 mph13 km/h from S, gusts 18 mph29 km/h | 69% | 53% | 3 |
| Mon 2p | Cloudy | 43°6° (likely 40°4° to 43°6°) | 38°3° | 0% | 8 mph13 km/h from S, gusts 19 mph31 km/h | 68% | 81% | 3 |
| Mon 3p | Mostly cloudy | 44°7° (likely 40°4° to 44°7°) | 39°4° | 0% | 8 mph13 km/h from S, gusts 20 mph32 km/h | 66% | 58% | 3 |
| Mon 4p | Mostly cloudy | 44°7° (likely 38°3° to 44°7°) | 40°4° | 0% | 7 mph11 km/h from SSE, gusts 19 mph31 km/h | 66% | 63% | 3 |
| Mon 5p | Cloudy | 43°6° (likely 36°2° to 43°6°) | 39°4° | 0% | 6 mph10 km/h from SSE, gusts 20 mph32 km/h | 67% | 60% | 1 |
| Mon 6p | Mostly cloudy | 39°4° (likely 34°1° to 39°4°) | 36°2° | 0%, 0.05 in1.3 mm | 5 mph8 km/h from SSE, gusts 19 mph30 km/h | 75% | 43% | 0 |
| Mon 7p | Mostly cloudy | 37°3° (likely 32°0° to 37°3°) | 33°1° | 5%, 0.05 in1.3 mm | 5 mph8 km/h from SSE, gusts 18 mph28 km/h | 82% | 60% | 0 |
| Mon 8p | Partly cloudy | 34°1° (likely 32°0° to 37°3°) | 30°−1° | 30%, 0.05 in1.3 mm | 5 mph8 km/h from SSE, gusts 15 mph24 km/h | 83% | 65% | 0 |
| Mon 9p | Cloudy | 37°3° (likely 31°−1° to 37°3°) | 32°0° | 50%, 0.05 in1.3 mm | 7 mph11 km/h from S, gusts 13 mph21 km/h | 75% | 91% | 0 |
| Mon 10p | Snow | 37°3° (likely 30°−1° to 37°3°) | 32°0° | 60%, 0.05 in1.3 mm | 7 mph11 km/h from S, gusts 17 mph27 km/h | 75% | 100% | 0 |
| Mon 11p | Snow | 37°3° (likely 29°−2° to 37°3°) | 32°0° | 70%, 0.05 in1.3 mm | 7 mph11 km/h from S, gusts 16 mph25 km/h | 78% | 100% | 0 |
| Tue 12a | Snow | 37°3° (likely 28°−2° to 37°3°) | 32°0° | 80%, snow 0.1 in0.3 cm | 7 mph11 km/h from WSW, gusts 13 mph20 km/h | 78% | 91% | 0 |
| Tue 1a | Snow | 37°3° (likely 28°−2° to 37°3°) | 32°0° | 40%, snow 0.1 in0.3 cm | 7 mph11 km/h from WSW, gusts 10 mph16 km/h | 75% | 80% | 0 |
| Tue 2a | Snow | 37°3° (likely 28°−2° to 37°3°) | 32°0° | 60%, snow 0.1 in0.3 cm | 7 mph11 km/h from WSW, gusts 14 mph22 km/h | 76% | 91% | 0 |
| Tue 3a | Snow | 36°2° (likely 27°−3° to 36°2°) | 29°−2° | 60%, snow 0.1 in0.3 cm | 9 mph14 km/h from W, gusts 16 mph26 km/h | 77% | 100% | 0 |
| Tue 4a | Snow | 36°2° (likely 27°−3° to 36°2°) | 29°−2° | 50%, snow 0.1 in0.3 cm | 9 mph14 km/h from W, gusts 17 mph28 km/h | 76% | 95% | 0 |
| Tue 5a | Snow | 36°2° (likely 27°−3° to 36°2°) | 29°−2° | 40%, snow 0.1 in0.3 cm | 9 mph14 km/h from W, gusts 18 mph29 km/h | 74% | 92% | 0 |
| Tue 6a | Snow | 35°2° (likely 27°−3° to 35°2°) | 27°−3° | 40%, snow 0.1 in0.3 cm | 10 mph16 km/h from W, gusts 15 mph24 km/h | 72% | 87% | 0 |
| Tue 7a | Snow | 36°2° (likely 26°−3° to 36°2°) | 29°−2° | 40%, snow 0.1 in0.3 cm | 10 mph16 km/h from W, gusts 14 mph22 km/h | 72% | 68% | 0 |
| Tue 8a | Snow | 35°2° (likely 25°−4° to 35°2°) | 27°−3° | 40%, snow 0.1 in0.3 cm | 10 mph16 km/h from W, gusts 13 mph20 km/h | 71% | 64% | 0 |
| Tue 9a | Snow | 35°2° (likely 25°−4° to 35°2°) | 27°−3° | 40%, snow 0.1 in0.3 cm | 10 mph16 km/h from W, gusts 16 mph25 km/h | 70% | 62% | 0 |
| Tue 10a | Snow | 35°2° (likely 27°−3° to 35°2°) | 27°−3° | 40%, snow 0.1 in0.3 cm | 10 mph16 km/h from W, gusts 21 mph34 km/h | 70% | 62% | 1 |
| Tue 11a | Cloudy | 35°2° (likely 29°−2° to 35°2°) | 27°−3° | 40%, snow 0.1 in0.3 cm | 10 mph16 km/h from W, gusts 23 mph37 km/h | 70% | 78% | 2 |
| Tue 12p | Partly sunny | 35°2° (likely 31°−1° to 35°2°) | 26°−3° | 20% | 14 mph23 km/h from WSW, gusts 23 mph37 km/h | 71% | 77% | 3 |
| Tue 1p | Snow | 35°2° (likely 34°1° to 36°2°) | 26°−3° | 20% | 14 mph23 km/h from WSW, gusts 23 mph37 km/h | 73% | 85% | 4 |
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Today: Sunny. High near 35, with temperatures falling to around 30 in the afternoon. Southeast wind around 6 mph.
Tonight: Partly cloudy. Low around 26, with temperatures rising to around 29 overnight. Southeast wind 2 to 7 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
70% chance · 0.3 in7.6 mm
Overnight
midnight–6 AM
80% chance · 0.6 in1.5 cm
Official NWS forecast
Day: Partly sunny, with a high near 44. South southeast wind around 8 mph.
Night: Rain and snow after 8pm. Mostly cloudy, with a low around 34. South southwest wind 5 to 9 mph. Chance of precipitation is 80%. Little or no snow accumulation expected.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
40% chance · 0.6 in1.5 cm
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Day: A chance of snow. Partly sunny, with a high near 40. West wind 10 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
Night: Partly cloudy, with a low around 28. West southwest wind 7 to 12 mph, with gusts as high as 20 mph.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Sunny, with a high near 42. South southwest wind around 10 mph, with gusts as high as 21 mph.
Night: A slight chance of snow before midnight. Mostly clear, with a low around 28. South southwest wind 5 to 8 mph. New snow accumulation of less than half an inch possible.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: Mostly sunny, with a high near 41.
Night: A slight chance of snow. Mostly cloudy, with a low around 27.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
20% chance
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of snow. Partly sunny, with a high near 38.
Night: A chance of snow. Mostly cloudy, with a low around 27.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A slight chance of snow. Partly sunny, with a high near 41.
Night: A chance of snow. Partly cloudy, with a low around 28.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
20% chance · 0.5 in1.1 cm
Overnight
midnight–6 AM
30% chance · 0.4 in1 cm
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
30% chance · 0.8 in2.1 cm
Afternoon
noon–6 PM
20% chance · 0.8 in2.1 cm
Evening
6 PM–midnight
20% chance · 0.5 in1.4 cm
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Hours this far out come from computer models only.
The National Weather Service writes about seven days ahead; this day is our model forecast only.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Dry, high 35°, low 26°.
Dry, high 44°, low 34°, warming up.
37% chance of snow, high 40°, low 28°, cooling off.
Mostly dry, highs 35–42°.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (TFX) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Reading from Sun 12:15 PM · NWS gauge page
Reading from Sun 12:30 PM · NWS gauge page
Reading from Sun 12:45 PM · NWS gauge page
Reading from Sun 12:15 PM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
Tonight’s low: 26°−3°
Overnight low near 26°F — not yet at drip-the-faucets cold, but worth watching if it's forecast to drop further.
About 68% less heating than a typical week.
Heating degree days, base 65°F
47, 17 and 5°F are the test points heat pumps are rated at. About 6 hours are near freezing and damp, when outdoor units defrost more often.
Dry air outside (dew point 28°F). Indoor air will run dry too — a humidifier keeping indoor relative humidity in the 30–50% range is more comfortable and cuts static shocks, without going so high it fogs cold windows.
No stretch in the next few days is comfortable enough outside, by temperature, dew point and air quality.
Today’s expected high is 18°10° colder than typical.
On average 6°3° warmer than normal (daily mean temperature).
Elkhorn weather by month: normals, records, snow and freeze dates
Sunrise 7:59 AM, sunset 6:23 PM.
Clouds most of the night (about 55% cover).
Full moon
100% lit · growing