Eastern Idaho Reservoirs at Island Park
22 mi- Level
- 6283 ft
Forecast peak 6285 ft Tue 5 AM
Reading from Sat 8:45 PM · NWS gauge page
Appearance
Model estimate for 10:00 PM MDT (no recent station report)
Clear and 25°−4°, drip faucets tonight, low 15°−9°.
Today: low 14°−10° (likely 14°−10° to 26°−3°), high 43°6° (likely 40°4° to 45°7°).
Now 25°−4°
Clear
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 10p | Clear | 25°−4° (likely 25°−4° to 33°1°) | 25°−4° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 96% | 11% | 0 |
| Sat 11p | Clear | 23°−5° (likely 23°−5° to 33°1°) | 23°−5° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 12% | 0 |
| Sun 12a | Clear | 22°−6° (likely 22°−6° to 32°0°) | 22°−6° | 0% | 0 mph0 km/h, gusts 3 mph6 km/h | 100% | 12% | 0 |
| Sun 1a | Clear | 21°−6° (likely 21°−6° to 31°−1°) | 21°−6° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 10% | 0 |
| Sun 2a | Clear | 20°−7° (likely 20°−7° to 31°−1°) | 20°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 9% | 0 |
| Sun 3a | Clear | 19°−7° (likely 19°−7° to 31°−1°) | 19°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 10% | 0 |
| Sun 4a | Clear | 19°−7° (likely 19°−7° to 31°−1°) | 19°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 9% | 0 |
| Sun 5a | Clear | 17°−8° (likely 17°−8° to 31°−1°) | 17°−8° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 9% | 0 |
| Sun 6a | Clear | 17°−8° (likely 17°−8° to 31°−1°) | 17°−8° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 10% | 0 |
| Sun 7a | Clear | 16°−9° (likely 16°−9° to 31°−1°) | 16°−9° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 7% | 0 |
| Sun 8a | Sunny | 15°−9° (likely 15°−9° to 31°−1°) | 15°−9° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 7% | 0 |
| Sun 9a | Sunny | 19°−7° (likely 19°−7° to 33°1°) | 19°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 11% | 0 |
| Sun 10a | Sunny | 27°−3° (likely 27°−3° to 37°3°) | 27°−3° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 5% | 1 |
| Sun 11a | Sunny | 33°1° (likely 33°1° to 41°5°) | 33°1° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 86% | 7% | 2 |
| Sun 12p | Sunny | 39°4° (likely 39°4° to 44°7°) | 39°4° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 72% | 7% | 3 |
| Sun 1p | Sunny | 46°8° (likely 45°7° to 48°9°) | 46°8° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 57% | 10% | 4 |
| Sun 2p | Sunny | 49°9° (likely 47°8° to 51°11°) | 49°9° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 46% | 11% | 4 |
| Sun 3p | Sunny | 51°11° (likely 48°9° to 52°11°) | 51°11° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 42% | 12% | 4 |
| Sun 4p | Sunny | 51°11° (likely 49°9° to 51°11°) | 51°11° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 42% | 10% | 3 |
| Sun 5p | Sunny | 49°9° (likely 47°8° to 50°10°) | 49°9° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 46% | 10% | 2 |
| Sun 6p | Clear | 45°7° (likely 43°6° to 47°8°) | 45°7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 55% | 9% | 1 |
| Sun 7p | Clear | 39°4° (likely 39°4° to 42°6°) | 39°4° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 73% | 9% | 0 |
| Sun 8p | Clear | 32°0° (likely 32°0° to 39°4°) | 32°0° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 85% | 6% | 0 |
| Sun 9p | Clear | 29°−2° (likely 29°−2° to 37°3°) | 29°−2° | 0% | 0 mph0 km/h, gusts 5 mph7 km/h | 91% | 7% | 0 |
| Sun 10p | Partly cloudy | 26°−3° (likely 26°−3° to 35°2°) | 26°−3° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 99% | 44% | 0 |
| Sun 11p | Partly cloudy | 25°−4° (likely 25°−4° to 34°1°) | 25°−4° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 100% | 45% | 0 |
| Mon 12a | Partly cloudy | 24°−4° (likely 24°−4° to 33°1°) | 24°−4° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 100% | 46% | 0 |
| Mon 1a | Partly cloudy | 23°−5° (likely 23°−5° to 33°1°) | 23°−5° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 100% | 49% | 0 |
| Mon 2a | Partly cloudy | 22°−6° (likely 22°−6° to 33°1°) | 22°−6° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 50% | 0 |
| Mon 3a | Mostly cloudy | 20°−7° (likely 20°−7° to 33°1°) | 20°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 52% | 0 |
| Mon 4a | Mostly cloudy | 20°−7° (likely 20°−7° to 33°1°) | 20°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 51% | 0 |
| Mon 5a | Mostly cloudy | 20°−7° (likely 20°−7° to 33°1°) | 20°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 52% | 0 |
| Mon 6a | Mostly cloudy | 18°−8° (likely 18°−8° to 32°0°) | 18°−8° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 55% | 0 |
| Mon 7a | Mostly cloudy | 20°−7° (likely 20°−7° to 32°0°) | 20°−7° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 100% | 72% | 0 |
| Mon 8a | Cloudy | 22°−6° (likely 22°−6° to 32°0°) | 22°−6° | 0% | 0 mph0 km/h, gusts 3 mph6 km/h | 100% | 84% | 0 |
| Mon 9a | Cloudy | 24°−4° (likely 24°−4° to 34°1°) | 24°−4° | 0% | 0 mph0 km/h, gusts 3 mph6 km/h | 100% | 91% | 0 |
| Mon 10a | Cloudy | 30°−1° (likely 30°−1° to 39°4°) | 30°−1° | 0% | 0 mph0 km/h, gusts 3 mph6 km/h | 95% | 91% | 1 |
| Mon 11a | Cloudy | 36°2° (likely 36°2° to 43°6°) | 36°2° | 0% | 0 mph0 km/h, gusts 10 mph16 km/h | 88% | 91% | 2 |
| Mon 12p | Cloudy | 41°5° (likely 41°5° to 46°8°) | 41°5° | 5% | 2 mph3 km/h from SSW, gusts 12 mph19 km/h | 80% | 87% | 3 |
| Mon 1p | Cloudy | 45°7° (likely 45°7° to 48°9°) | 45°7° | 5% | 2 mph3 km/h from SSW, gusts 18 mph29 km/h | 70% | 72% | 4 |
| Mon 2p | Cloudy | 47°8° (likely 47°8° to 49°9°) | 47°8° | 5% | 2 mph3 km/h from SSW, gusts 21 mph33 km/h | 61% | 81% | 3 |
| Mon 3p | Partly sunny | 48°9° (likely 48°9° to 49°9°) | 44°7° | 5% | 8 mph13 km/h from SSW, gusts 22 mph35 km/h | 56% | 47% | 3 |
| Mon 4p | Partly sunny | 47°8° (likely 47°8° to 49°9°) | 43°6° | 5% | 8 mph13 km/h from SSW, gusts 21 mph33 km/h | 56% | 32% | 3 |
| Mon 5p | Partly sunny | 45°7° (likely 45°7° to 48°9°) | 41°5° | 5% | 8 mph13 km/h from SSW, gusts 20 mph33 km/h | 60% | 23% | 2 |
| Mon 6p | Clear | 42°6° (likely 42°6° to 45°7°) | 42°6° | 50%, 0.02 in0.5 mm | 1 mph2 km/h from SSW, gusts 13 mph21 km/h | 67% | 38% | 1 |
| Mon 7p | Rain | 39°4° (likely 37°3° to 42°6°) | 39°4° | 50%, 0.02 in0.5 mm | 1 mph2 km/h from SSW, gusts 8 mph12 km/h | 78% | 50% | 0 |
| Mon 8p | Rain | 34°1° (likely 34°1° to 40°4°) | 34°1° | 50%, 0.02 in0.5 mm | 1 mph2 km/h from SSW, gusts 7 mph11 km/h | 90% | 56% | 0 |
| Mon 9p | Snow | 31°−1° (likely 31°−1° to 40°4°) | 26°−3° | 50%, 0.02 in0.5 mm | 5 mph8 km/h from SSE, gusts 10 mph16 km/h | 99% | 66% | 0 |
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Tonight: Areas of fog after midnight. Mostly clear. Low around 14, with temperatures rising to around 17 overnight. Wind around 0 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
Dry
Overnight
midnight–6 AM
Dry
Official NWS forecast
Day: Areas of fog before 11am. Sunny, with a high near 51. Wind around 0 mph.
Night: Partly cloudy, with a low around 16. Wind around 0 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
60% chance · 0.13 in3.3 mm
Overnight
midnight–6 AM
90% chance · 0.2 in0.6 cm
Official NWS forecast
Day: Partly sunny, with a high near 48. Southwest wind 0 to 8 mph.
Night: A chance of rain before 9pm, then rain and snow. Mostly cloudy, with a low around 16. South wind 1 to 13 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New snow accumulation of less than half an inch possible.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
90% chance · 0.02 in0.4 mm
Afternoon
noon–6 PM
80% chance · 0.02 in0.4 mm
Evening
6 PM–midnight
50% chance
Overnight
midnight–6 AM
30% chance
Hours this far out come from computer models only.
Official NWS forecast
Day: Snow. Cloudy, with a high near 38. Southwest wind 13 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 80%. New snow accumulation of around one inch possible.
Night: A chance of snow before midnight. Mostly cloudy, with a low around 14. South southwest wind 7 to 17 mph, with gusts as high as 31 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.
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 cloudy, with a high near 42.
Night: Partly cloudy, with a low around 15.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
30% chance · 0.01 in0.3 mm
Afternoon
noon–6 PM
40% chance · 0.2 in0.5 cm
Evening
6 PM–midnight
50% chance · 0.2 in0.5 cm
Overnight
midnight–6 AM
50% chance · 0.2 in0.4 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of snow before noon, then a chance of rain. Partly sunny, with a high near 46.
Night: A chance of rain and snow. Mostly cloudy, with a low around 18. Little or no snow accumulation expected.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
50% chance · 0.1 in0.3 cm
Afternoon
noon–6 PM
60% chance · 0.03 in0.7 mm
Evening
6 PM–midnight
60% chance · 0.09 in2.3 mm
Overnight
midnight–6 AM
50% chance · 0.1 in0.3 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of snow before noon, then a chance of rain and snow. Mostly cloudy, with a high near 46. Little or no snow accumulation expected.
Night: A chance of rain and snow. Mostly cloudy, with a low around 17. New snow accumulation of less than half an inch possible.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
50% chance · 0.03 in0.8 mm
Afternoon
noon–6 PM
40% chance · 0.01 in0.3 mm
Evening
6 PM–midnight
30% chance · 0.02 in0.4 mm
Overnight
midnight–6 AM
30% chance · 0.2 in0.5 cm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of snow. Mostly cloudy, with a high near 44. Little or no snow accumulation expected.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
30% chance · 0.1 in0.3 cm
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
30% chance
Overnight
midnight–6 AM
30% chance · 0.1 in0.3 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
20% chance
Afternoon
noon–6 PM
20% chance
Evening
6 PM–midnight
30% chance
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 43°, low 14°.
Dry, high 51°, low 16°, warming up.
Dry, high 48°, low 16°, cooling off.
Highs 35–46°; chance of precipitation on Tuesday, Friday, Saturday.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (TFX) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 6285 ft Tue 5 AM
Reading from Sat 8:45 PM · NWS gauge page
Reading from Sat 9:30 PM · NWS gauge page
Reading from Sat 9 PM · NWS gauge page
Reading from Sat 9 PM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
Tonight’s low: 15°−9°
Overnight low of 15°F for 8+ hours — cold enough that pipes in unheated spaces can freeze. Let faucets on exterior walls drip overnight.
About 72% 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 8 hours are near freezing and damp, when outdoor units defrost more often.
Cold-climate heat pump? Look up certified models on rebate.blue (opens in a new tab)
Dry air outside (dew point 24°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 3°2° colder than typical.
On average 8°4° warmer than normal (daily mean temperature).
West Yellowstone weather by month: normals, records, snow and freeze dates
Sunrise 7:51 AM, sunset 6:24 PM.
Clear 10:46 PM–7:23 AM, but the moon is 99% lit and up.
Waxing gibbous
99% lit · growing