Columbia River at St. Helens
4.3 mi- Level
- 0.9 ft
Forecast peak 5.5 ft Wed 6 PM
Reading from Sat 12:06 AM · NWS gauge page
Appearance
Ends in 8 h 21 min
Issued for this forecast zone · National Weather Service Portland OR
What
Temperatures of 33 to 36 degrees will result in frost formation.
Impacts
Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.
Precautionary actions
Take steps now to protect tender outdoor plants from the cold. Consider temporarily moving outdoor potted plants indoors if they are sensitive to cold temperatures, or temporarily covering sensitive plants with a lightweight cotton fabric (i.e., bedsheets, thin blankets), as this will help retain heat and provide frost protection for your plants.
Areas: Clatsop County Coast; Tillamook County Coast; Central Coast of Oregon; Central Oregon Coast Range Lowlands; Central Oregon Coast Range; Lower Columbia River; Tualatin Valley; Inner Portland Metro; East Portland Metro; Outer Southeast Portland Metro; West Columbia River Gorge of Oregon above 500 ft; Clackamas County Cascade Foothills; Willapa Hills; Cowlitz County Lowlands; North Clark County Lowlands; Inner Vancouver Metro; East Clark County Lowlands; South Washington Cascade Foothills
See it on weather.gov (opens in a new tab)Observed 1:15 AM PDT at KKLS
Overcast and 39°4°.
Today: low 38°3° (likely 36°2° to 43°6°), high 64°18° (likely 57°14° to 64°18°).
Now 39°4°
Cloudy
No precipitation expected in the next 2 hours.
From forecast models
| Hour | Conditions | Temperature | Feels like | Precipitation | Wind | Humidity | Cloud cover | UV index |
|---|---|---|---|---|---|---|---|---|
| Sat 1a | Partly cloudy | 43°6° (likely 39°4° to 44°7°) | 43°6° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 93% | 45% | 0 |
| Sat 2a | Fog | 42°6° (likely 38°3° to 44°7°) | 42°6° | 0% | 1 mph2 km/h from N, gusts 4 mph7 km/h | 95% | 53% | 0 |
| Sat 3a | Fog | 41°5° (likely 37°3° to 44°7°) | 41°5° | 0% | 1 mph2 km/h from NNW, gusts 3 mph5 km/h | 96% | 71% | 0 |
| Sat 4a | Fog | 40°4° (likely 37°3° to 44°7°) | 40°4° | 0% | 1 mph2 km/h from N, gusts 3 mph4 km/h | 97% | 69% | 0 |
| Sat 5a | Fog | 39°4° (likely 37°3° to 44°7°) | 39°4° | 0% | 1 mph2 km/h from N, gusts 3 mph5 km/h | 96% | 75% | 0 |
| Sat 6a | Cloudy | 39°4° (likely 37°3° to 44°7°) | 39°4° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 94% | 68% | 0 |
| Sat 7a | Cloudy | 38°3° (likely 36°2° to 44°7°) | 38°3° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 94% | 80% | 0 |
| Sat 8a | Cloudy | 38°3° (likely 36°2° to 44°7°) | 38°3° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 94% | 80% | 0 |
| Sat 9a | Cloudy | 40°4° (likely 39°4° to 45°7°) | 40°4° | 0% | 0 mph0 km/h, gusts 2 mph3 km/h | 92% | 82% | 0 |
| Sat 10a | Cloudy | 46°8° (likely 45°7° to 49°9°) | 46°8° | 0% | 0 mph0 km/h, gusts 3 mph4 km/h | 85% | 84% | 1 |
| Sat 11a | Cloudy | 51°11° (likely 48°9° to 53°12°) | 51°11° | 0% | 1 mph2 km/h from W, gusts 3 mph5 km/h | 76% | 76% | 2 |
| Sat 12p | Cloudy | 56°13° (likely 52°11° to 56°13°) | 56°13° | 0% | 1 mph2 km/h from WSW, gusts 4 mph6 km/h | 67% | 81% | 2 |
| Sat 1p | Cloudy | 60°16° (likely 55°13° to 60°16°) | 60°16° | 0% | 1 mph2 km/h from SW, gusts 5 mph8 km/h | 60% | 82% | 3 |
| Sat 2p | Cloudy | 62°17° (likely 56°13° to 62°17°) | 62°17° | 0% | 2 mph3 km/h from SW, gusts 6 mph9 km/h | 55% | 83% | 3 |
| Sat 3p | Cloudy | 62°17° (likely 57°14° to 62°17°) | 62°17° | 0% | 2 mph3 km/h from SW, gusts 6 mph10 km/h | 53% | 83% | 2 |
| Sat 4p | Cloudy | 63°17° (likely 57°14° to 63°17°) | 63°17° | 0% | 0 mph0 km/h, gusts 6 mph10 km/h | 51% | 82% | 2 |
| Sat 5p | Cloudy | 61°16° (likely 56°13° to 61°16°) | 61°16° | 0% | 0 mph0 km/h, gusts 5 mph8 km/h | 55% | 82% | 1 |
| Sat 6p | Cloudy | 58°14° (likely 53°12° to 58°14°) | 58°14° | 0% | 0 mph0 km/h, gusts 4 mph7 km/h | 63% | 83% | 0 |
| Sat 7p | Cloudy | 55°13° (likely 51°11° to 55°13°) | 55°13° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 68% | 81% | 0 |
| Sat 8p | Cloudy | 52°11° (likely 49°9° to 52°11°) | 52°11° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 70% | 91% | 0 |
| Sat 9p | Cloudy | 51°11° (likely 48°9° to 51°11°) | 51°11° | 0% | 0 mph0 km/h, gusts 4 mph6 km/h | 73% | 90% | 0 |
| Sat 10p | Cloudy | 49°9° (likely 47°8° to 49°9°) | 49°9° | 0% | 0 mph0 km/h, gusts 3 mph6 km/h | 75% | 81% | 0 |
| Sat 11p | Cloudy | 48°9° (likely 47°8° to 49°9°) | 48°9° | 0% | 0 mph0 km/h, gusts 3 mph5 km/h | 76% | 80% | 0 |
| Sun 12a | Cloudy | 48°9° (likely 46°8° to 49°9°) | 48°9° | 0% | 1 mph2 km/h from E, gusts 3 mph5 km/h | 75% | 74% | 0 |
| Sun 1a | Cloudy | 46°8° (likely 45°7° to 48°9°) | 46°8° | 0% | 2 mph3 km/h from ESE, gusts 3 mph5 km/h | 76% | 69% | 0 |
| Sun 2a | Cloudy | 46°8° (likely 45°7° to 46°8°) | 45°7° | 5% | 3 mph5 km/h from ESE, gusts 3 mph5 km/h | 77% | 65% | 0 |
| Sun 3a | Cloudy | 44°7° (likely 44°7° to 46°8°) | 42°6° | 5% | 3 mph5 km/h from ESE, gusts 5 mph8 km/h | 78% | 64% | 0 |
| Sun 4a | Cloudy | 43°6° (likely 43°6° to 46°8°) | 40°4° | 10% | 5 mph8 km/h from ESE, gusts 4 mph7 km/h | 80% | 65% | 0 |
| Sun 5a | Rain | 43°6° (likely 43°6° to 46°8°) | 39°4° | 50%, 0.11 in2.8 mm | 6 mph10 km/h from ESE, gusts 4 mph6 km/h | 80% | 65% | 0 |
| Sun 6a | Cloudy | 42°6° (likely 42°6° to 46°8°) | 38°3° | 60%, 0.11 in2.8 mm | 6 mph10 km/h from ESE, gusts 4 mph7 km/h | 80% | 88% | 0 |
| Sun 7a | Rain | 43°6° (likely 43°6° to 46°8°) | 39°4° | 20%, 0.11 in2.8 mm | 6 mph10 km/h from ESE, gusts 6 mph9 km/h | 82% | 95% | 0 |
| Sun 8a | Rain | 42°6° (likely 42°6° to 47°8°) | 38°3° | 30%, 0.11 in2.8 mm | 7 mph11 km/h from SE, gusts 6 mph9 km/h | 84% | 96% | 0 |
| Sun 9a | Rain | 43°6° (likely 43°6° to 48°9°) | 39°4° | 30%, 0.11 in2.8 mm | 7 mph11 km/h from SE, gusts 8 mph13 km/h | 89% | 87% | 0 |
| Sun 10a | Rain | 48°9° (likely 46°8° to 53°12°) | 45°7° | 30%, 0.11 in2.8 mm | 7 mph11 km/h from SE, gusts 13 mph20 km/h | 84% | 100% | 1 |
| Sun 11a | Rain | 51°11° (likely 47°8° to 56°13°) | 51°11° | 40%, 0.22 in5.6 mm | 8 mph13 km/h from ESE, gusts 13 mph21 km/h | 82% | 100% | 2 |
| Sun 12p | Rain | 54°12° (likely 47°8° to 58°14°) | 54°12° | 60%, 0.22 in5.6 mm | 8 mph13 km/h from ESE, gusts 14 mph23 km/h | 79% | 100% | 2 |
| Sun 1p | Rain | 57°14° (likely 48°9° to 61°16°) | 57°14° | 70%, 0.22 in5.6 mm | 8 mph13 km/h from ESE, gusts 14 mph22 km/h | 77% | 100% | 3 |
| Sun 2p | Rain | 58°14° (likely 49°9° to 62°17°) | 58°14° | 80%, 0.22 in5.6 mm | 7 mph11 km/h from ESE, gusts 14 mph23 km/h | 75% | 99% | 3 |
| Sun 3p | Rain | 58°14° (likely 50°10° to 63°17°) | 58°14° | 70%, 0.22 in5.6 mm | 7 mph11 km/h from ESE, gusts 16 mph26 km/h | 75% | 58% | 2 |
| Sun 4p | Rain | 59°15° (likely 50°10° to 63°17°) | 59°15° | 70%, 0.22 in5.6 mm | 7 mph11 km/h from ESE, gusts 15 mph23 km/h | 75% | 60% | 2 |
| Sun 5p | Rain | 57°14° (likely 50°10° to 63°17°) | 57°14° | 80%, 0.07 in1.8 mm | 5 mph8 km/h from SE, gusts 13 mph20 km/h | 78% | 85% | 1 |
| Sun 6p | Cloudy | 56°13° (likely 50°10° to 60°16°) | 56°13° | 80%, 0.07 in1.8 mm | 5 mph8 km/h from SE, gusts 11 mph18 km/h | 81% | 93% | 0 |
| Sun 7p | Cloudy | 55°13° (likely 50°10° to 57°14°) | 55°13° | 80%, 0.07 in1.8 mm | 5 mph8 km/h from SE, gusts 15 mph24 km/h | 82% | 92% | 0 |
| Sun 8p | Cloudy | 53°12° (likely 51°11° to 54°12°) | 53°12° | 80%, 0.07 in1.8 mm | 5 mph8 km/h from SE, gusts 11 mph17 km/h | 83% | 97% | 0 |
| Sun 9p | Rain | 52°11° (likely 51°11° to 52°11°) | 52°11° | 80%, 0.07 in1.8 mm | 5 mph8 km/h from SE, gusts 13 mph21 km/h | 84% | 98% | 0 |
| Sun 10p | Rain | 52°11° (likely 50°10° to 53°12°) | 52°11° | 80%, 0.07 in1.8 mm | 5 mph8 km/h from SE, gusts 14 mph22 km/h | 84% | 98% | 0 |
| Sun 11p | Rain | 51°11° (likely 49°9° to 52°11°) | 51°11° | 80%, 0.06 in1.5 mm | 7 mph11 km/h from SE, gusts 13 mph21 km/h | 85% | 99% | 0 |
| Mon 12a | Rain | 50°10° (likely 44°7° to 52°11°) | 47°8° | 80%, 0.06 in1.5 mm | 7 mph11 km/h from SE, gusts 8 mph13 km/h | 85% | 69% | 0 |
Morning
6 AM–noon
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
50% chance · 0.11 in2.8 mm
Official NWS forecast
Today: Partly sunny. High near 64, with temperatures falling to around 61 in the afternoon. West wind around 2 mph.
Tonight: Patchy fog after 2am. Partly cloudy, with a low around 38. North northwest wind around 1 mph.
Mostly agreeIndependent forecasts are fairly close; small surprises are possible.
Morning
6 AM–noon
60% chance · 0.77 in20 mm
Afternoon
noon–6 PM
80% chance · 1.2 in30 mm
Evening
6 PM–midnight
80% chance · 0.41 in10 mm
Overnight
midnight–6 AM
80% chance · 0.2 in5.1 mm
Official NWS forecast
Day: Rain. Mostly cloudy, with a high near 60. Southeast wind 5 to 8 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Night: Rain. Mostly cloudy, with a low around 45. Southeast wind around 7 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
80% chance · 0.12 in2.9 mm
Afternoon
noon–6 PM
60% chance · 0.05 in1.2 mm
Evening
6 PM–midnight
50% chance · 0.06 in1.6 mm
Overnight
midnight–6 AM
40% chance · 0.05 in1.2 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely. Mostly cloudy, with a high near 61. Chance of precipitation is 70%.
Night: A chance of rain before 3am, then a chance of rain and patchy fog between 3am and 5am, then patchy fog and a slight chance of rain. Mostly cloudy, with a low around 44.
Forecasts differIndependent forecasts disagree; expect changes and plan for the range.
Morning
6 AM–noon
30% chance · 0.04 in1 mm
Afternoon
noon–6 PM
30% chance · 0.06 in1.6 mm
Evening
6 PM–midnight
30% chance · 0.05 in1.3 mm
Overnight
midnight–6 AM
50% chance · 0.14 in3.5 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain and patchy fog. Mostly cloudy, with a high near 62.
Night: A chance of rain. Mostly cloudy, with a low around 42.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
60% chance · 0.1 in2.5 mm
Afternoon
noon–6 PM
60% chance · 0.15 in3.9 mm
Evening
6 PM–midnight
50% chance · 0.13 in3.3 mm
Overnight
midnight–6 AM
40% chance · 0.07 in1.7 mm
Hours this far out come from computer models only.
Official NWS forecast
Day: Rain likely. Mostly cloudy, with a high near 61.
Night: A chance of rain. Mostly cloudy, with a low around 41.
Forecasts agreeIndependent forecasts are close; the range is narrow.
Morning
6 AM–noon
40% chance · 0.11 in2.7 mm
Afternoon
noon–6 PM
40% chance · 0.21 in5.3 mm
Evening
6 PM–midnight
30% chance · 0.09 in2.4 mm
Overnight
midnight–6 AM
Dry
Hours this far out come from computer models only.
Official NWS forecast
Day: A chance of rain. Partly sunny, with a high near 60.
Night: A chance of rain before 5am. Mostly cloudy, with a low around 39.
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 rain between 11am and 5pm. Partly sunny, with a high near 61.
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.
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
Dry
Afternoon
noon–6 PM
Dry
Evening
6 PM–midnight
Dry
Overnight
midnight–6 AM
20% 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.
Morning
6 AM–noon
20% chance
Afternoon
noon–6 PM
20% chance · 0.07 in1.9 mm
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 64°, low 38°.
79% chance of rain, high 60°, low 45°, cooling off.
73% chance of rain, high 61°, low 44°.
Highs 52–62°; chance of precipitation on Wednesday, Thursday.
Want the meteorologists’ reasoning? Read the NWS forecast discussion (PQR) (opens in a new tab)
No meaningful changes from yesterday’s forecast.
Forecast peak 5.5 ft Wed 6 PM
Reading from Sat 12:06 AM · NWS gauge page
Forecast peak 7.3 ft Wed 5 PM
Reading from Sat 12:06 AM · NWS gauge page
Forecast peak 10.0 ft Sat 5 AM
Reading from Sat 12:21 AM · NWS gauge page
Forecast peak 5.2 ft Wed 7 PM
Reading from Fri 11:54 PM · NWS gauge page
What this week’s weather means for heating, cooling, pipes and fresh air.
About 75% 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 10 hours are near freezing and damp, when outdoor units defrost more often.
Dry air outside (dew point 37°F).
Today, 1:00 PM–5:00 PM
Good stretch to open the windows.
Today’s expected high is 5°3° warmer than typical.
Woodland weather by month: normals, records, snow and freeze dates
Sunrise 7:40 AM, sunset 6:09 PM.
Clouds most of the night (about 66% cover).
Waxing gibbous
96% lit · growing