Annual mean 12°C · wettest around January · prevailing wind S
Warmest
25.2 °C
Coldest
6.0 °C
Wettest
28%
Windiest
3.3 m/s
Prevailing
S
2.5 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Every reading
bars actual · line feels-like, °Cchance of rain, %wind speed, m/ssky covered, %
The average temperature in Forest Grove over the whole year is 12°C. August is the hottest month, with highs of about 26°C; February is the coldest, with lows of about 3°C. The rainy (wet) season in Forest Grove runs from October to April, peaking in January with a 32% chance of rain on a given day. The dry season is May to September; July is the driest month, at 10%. Winds in Forest Grove are highest in March, averaging 2.3 m/s (8 km/h), and lightest in September, at 1.7 m/s (6 km/h). The prevailing wind is from the S. The clearest skies in Forest Grove come in July, when the sky is typically 28% covered; December is the cloudiest month, at 74%.
Month by month Forest Grove climate by month: average temperatures year round · click a month to read it
Month
High
Low
Feels like
Chance of rain
Cloud
Wind
Being outside
Sun
Walking
January
7°C
4°C
4°C
32%
72%
2.1 m/s
0
0
29
February
7°C
3°C
4°C
29%
72%
2.2 m/s
0
0
31
March
10°C
4°C
7°C
27%
64%
2.3 m/s
5
0
52
April
14°C
6°C
11°C
22%
57%
2.3 m/s
22
2
73
May
18°C
10°C
15°C
17%
52%
2.2 m/s
52
8
81
June
22°C
13°C
19°C
16%
44%
2.3 m/s
71
18
73
July
26°C
14°C
23°C
10%
28%
2.3 m/s
81
38
53
August
26°C
14°C
24°C
11%
30%
2.0 m/s
78
43
48
September
21°C
12°C
20°C
16%
44%
1.7 m/s
82
18
72
October
16°C
8°C
13°C
24%
55%
1.7 m/s
42
3
81
November
10°C
6°C
7°C
31%
70%
1.9 m/s
6
0
53
December
7°C
4°C
4°C
30%
74%
1.9 m/s
0
0
26
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Forest Grove weather by season
Year round, Forest Grove has days of about 7°C at their warmest in December, its coolest month, and 26°C in August, its warmest; the coolest hours of the day run from 3°C to 14°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around January and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Forest Grove weather in winterDecember to February
High 7°CLow 3°CRain 30%
Winter in Forest Grove has typical daily highs of about 7°C and lows of about 3°C, with a 30% chance of rain on a given day.
Forest Grove weather in springMarch to May
High 14°CLow 7°CRain 22%
Spring in Forest Grove has typical daily highs of about 14°C and lows of about 7°C, with a 22% chance of rain on a given day.
Forest Grove weather in summerJune to August
High 24°CLow 14°CRain 12%
Summer in Forest Grove has typical daily highs of about 24°C and lows of about 14°C, with a 12% chance of rain on a given day.
Forest Grove weather in autumnSeptember to November
High 16°CLow 8°CRain 24%
Autumn in Forest Grove has typical daily highs of about 16°C and lows of about 8°C, with a 24% chance of rain on a given day.
When is the rainy season in Forest Grove?
The rainy (wet) season in Forest Grove runs from October to April, peaking in January with a 32% chance of rain on a given day. The dry season is May to September; July is the driest month, at 10%.
What time of year is Forest Grove windiest?
Winds in Forest Grove are highest in March, averaging 2.3 m/s (8 km/h), and lightest in September, at 1.7 m/s (6 km/h). The prevailing wind is from the S.
What is the average temperature in Forest Grove year round?
The average temperature in Forest Grove over the whole year is 12°C. August is the hottest month, with highs of about 26°C; February is the coldest, with lows of about 3°C.