Monthly outlook for Helvetia, OR: average high 50.3°, average low 41.9°. That is 0.7° above the climate normal for November. Precipitation is expected on 8 days (about 2.7 inches), against a normal of 9 days and 3.9 inches. The warmest day looks like 14 November (56.6°), the coolest 19 November (37.1°).
50.3°/41.9°
Average high / low
+0.7°
Above normal
8 / 9
Wet days / normal
2.7 in
Precipitation this month
Ten-day blocks vs climate normal
Period
Forecast high
Normal
Difference
14 November – 23 November
51.6°
49.9°
+0.9°
24 November – 3 December
48.1°
47.3°
+0.4°
4 December – 13 December
at normal
45.6°
—
November records over 66 years
68.2°1 November 1962All-time high
8.1°23 November 1985All-time low
Climate normals and records are computed from the nearest reference point — Hillsboro (5 mi).
Sun, 1553° / 46°0.59
53 °
Helvetia, Sunday, 15 November
Rain. High 53°, low 46°.
Pressure29.88 inHg
Wind8.7 mph S
Humidity84%
Visibility2.3 mi
Dew point48°
Mon, 1653° / 41°0.03
53 °
Helvetia, Monday, 16 November
Light rain. High 53°, low 41°.
Pressure30.12 inHg
Wind1.9 mph S
Humidity75%
Visibility6.2 mi
Dew point43°
Tue, 1750° / 41°0
50 °
Helvetia, Tuesday, 17 November
Overcast. High 50°, low 41°.
Pressure29.94 inHg
Wind2.9 mph SE
Humidity83%
Visibility6.2 mi
Dew point42°
Wed, 1849° / 39°0.1
49 °
Helvetia, Wednesday, 18 November
Light rain. High 49°, low 39°.
Pressure29.83 inHg
Wind6.2 mph NE
Humidity75%
Visibility6.2 mi
Dew point40°
Thu, 1955° / 37°0
55 °
Helvetia, Thursday, 19 November
Clear. High 55°, low 37°.
Pressure30.03 inHg
Wind6.7 mph NE
Humidity67%
Visibility—
Dew point38°
Fri, 2052° / 39°0
52 °
Helvetia, Friday, 20 November
Overcast. High 52°, low 39°.
Pressure29.97 inHg
Wind4.9 mph S
Humidity79%
Visibility—
Dew point38°
Sat, 2147° / 45°0.43
47 °
Helvetia, Saturday, 21 November
Rain. High 47°, low 45°.
Pressure29.88 inHg
Wind5.1 mph E
Humidity92%
Visibility—
Dew point43°
Sun, 2253° / 44°0.01
53 °
Helvetia, Sunday, 22 November
Light rain. High 53°, low 44°.
Pressure30.03 inHg
Wind4.3 mph SE
Humidity83%
Visibility—
Dew point43°
Mon, 2345° / 43°0.44
45 °
Helvetia, Monday, 23 November
Rain. High 45°, low 43°.
Pressure29.77 inHg
Wind5 mph NE
Humidity84%
Visibility—
Dew point40°
Tue, 2449° / 42°0.42
49 °
Helvetia, Tuesday, 24 November
Rain. High 49°, low 42°.
Pressure29.56 inHg
Wind8.3 mph S
Humidity97%
Visibility—
Dew point46°
Wed, 2548° / 41°0.06
48 °
Helvetia, Wednesday, 25 November
Light rain. High 48°, low 41°.
Pressure30.21 inHg
Wind3.9 mph S
Humidity89%
Visibility—
Dew point42°
Thu, 2649° / 39°0
49 °
Helvetia, Thursday, 26 November
Partly cloudy. High 49°, low 39°.
Pressure30.27 inHg
Wind6.9 mph NE
Humidity80%
Visibility—
Dew point38°
Fri, 2749° / 42°0
49 °
Helvetia, Friday, 27 November
Overcast. High 49°, low 42°.
Pressure29.85 inHg
Wind4.3 mph NE
Humidity66%
Visibility—
Dew point35°
Sat, 2844° / 38°0.38
44 °
Helvetia, Saturday, 28 November
Rain. High 44°, low 38°.
Pressure29.97 inHg
Wind2.3 mph E
Humidity71%
Visibility—
Dew point33°
Sun, 2949° / 44°0.01
49 °
Helvetia, Sunday, 29 November
Light rain. High 49°, low 44°.
Pressure30.18 inHg
Wind3 mph S
Humidity88%
Visibility—
Dew point45°
From day 17 onward the outlook is built from 60-year climate statistics
Mon, 3047° / 37°0.27
47 °
Helvetia, Monday, 30 November
Climate normal for this date — 60-year average.
Average high47°
Average low37°
Average precipitation0.27 in
Chance of precipitation63%
Record high59° (2008)
Record low15° (1985)
Tue, 0147° / 37°0.26
47 °
Helvetia, Tuesday, 1 December
Climate normal for this date — 60-year average.
Average high47°
Average low37°
Average precipitation0.26 in
Chance of precipitation58%
Record high57° (2021)
Record low20° (1985)
Wed, 0247° / 37°0.36
47 °
Helvetia, Wednesday, 2 December
Climate normal for this date — 60-year average.
Average high47°
Average low37°
Average precipitation0.36 in
Chance of precipitation60%
Record high57° (1975)
Record low19° (1985)
Thu, 0347° / 37°0.3
47 °
Helvetia, Thursday, 3 December
Climate normal for this date — 60-year average.
Average high47°
Average low37°
Average precipitation0.3 in
Chance of precipitation53%
Record high56° (2023)
Record low26° (1992)
Fri, 0446° / 36°0.3
46 °
Helvetia, Friday, 4 December
Climate normal for this date — 60-year average.
Average high46°
Average low36°
Average precipitation0.3 in
Chance of precipitation58%
Record high59° (2023)
Record low23° (1994)
Sat, 0546° / 35°0.23
46 °
Helvetia, Saturday, 5 December
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.23 in
Chance of precipitation48%
Record high58° (2023)
Record low22° (1972)
Sun, 0646° / 36°0.28
46 °
Helvetia, Sunday, 6 December
Climate normal for this date — 60-year average.
Average high46°
Average low36°
Average precipitation0.28 in
Chance of precipitation58%
Record high56° (2023)
Record low20° (1972)
Mon, 0745° / 36°0.24
45 °
Helvetia, Monday, 7 December
Climate normal for this date — 60-year average.
Average high45°
Average low36°
Average precipitation0.24 in
Chance of precipitation50%
Record high56° (2015)
Record low11° (1972)
Tue, 0846° / 35°0.22
46 °
Helvetia, Tuesday, 8 December
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.22 in
Chance of precipitation47%
Record high58° (2015)
Record low4° (1972)
Wed, 0946° / 35°0.31
46 °
Helvetia, Wednesday, 9 December
Climate normal for this date — 60-year average.
Average high46°
Average low35°
Average precipitation0.31 in
Chance of precipitation65%
Record high56° (2014)
Record low8° (1972)
Thu, 1046° / 37°0.34
46 °
Helvetia, Thursday, 10 December
Climate normal for this date — 60-year average.
Average high46°
Average low37°
Average precipitation0.34 in
Chance of precipitation62%
Record high59° (1993)
Record low5° (1972)
Fri, 1146° / 36°0.31
46 °
Helvetia, Friday, 11 December
Climate normal for this date — 60-year average.
Average high46°
Average low36°
Average precipitation0.31 in
Chance of precipitation67%
Record high59° (2025)
Record low14° (1972)
Sat, 1246° / 36°0.28
46 °
Helvetia, Saturday, 12 December
Climate normal for this date — 60-year average.
Average high46°
Average low36°
Average precipitation0.28 in
Chance of precipitation62%
Record high57° (1988)
Record low23° (1972)
Sun, 1345° / 36°0.31
45 °
Helvetia, Sunday, 13 December
Climate normal for this date — 60-year average.
Average high45°
Average low36°
Average precipitation0.31 in
Chance of precipitation57%
Record high56° (1977)
Record low6° (1972)
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Helvetia, OR are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Helvetia, OR since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.