Annual mean 11°C · wettest around January · prevailing wind W
Warmest
17.3 °C
Coldest
9.9 °C
Wettest
50%
Windiest
4.9 m/s
Prevailing
W
3.7 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
never good
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 Arcata over the whole year is 11°C. August is the hottest month, with highs of about 17°C; February is the coldest, with lows of about 6°C. The rainy (wet) season in Arcata runs from October to May, peaking in January with a 49% chance of rain on a given day. The dry season is June to September; July is the driest month, at 20%. Winds in Arcata are highest in March, averaging 3.1 m/s (11 km/h), and lightest in August, at 2.2 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Arcata come in October, when the sky is typically 50% covered; July is the cloudiest month, at 66%.
Month by month Arcata 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
11°C
7°C
8°C
49%
60%
3.0 m/s
8
0
60
February
10°C
6°C
7°C
48%
57%
2.9 m/s
6
0
52
March
11°C
6°C
8°C
48%
63%
3.1 m/s
5
0
56
April
13°C
8°C
9°C
40%
60%
3.1 m/s
7
0
68
May
14°C
9°C
10°C
36%
64%
3.0 m/s
9
1
78
June
16°C
11°C
13°C
23%
58%
2.8 m/s
26
2
90
July
16°C
12°C
15°C
20%
66%
2.5 m/s
49
2
91
August
17°C
12°C
16°C
21%
63%
2.2 m/s
63
2
91
September
17°C
11°C
16°C
26%
53%
2.2 m/s
57
3
88
October
15°C
9°C
13°C
36%
50%
2.2 m/s
34
1
87
November
13°C
8°C
11°C
44%
52%
2.4 m/s
17
0
76
December
11°C
7°C
8°C
47%
55%
2.5 m/s
7
0
63
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 Arcata weather by season
Year round, Arcata has days of about 10°C at their warmest in February, its coolest month, and 17°C in August, its warmest; the coolest hours of the day run from 6°C to 12°C through the year, and the average temperature over the year is 11°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.
Arcata weather in winterDecember to February
High 11°CLow 6°CRain 48%
Winter in Arcata has typical daily highs of about 11°C and lows of about 6°C, with a 48% chance of rain on a given day.
Arcata weather in springMarch to May
High 12°CLow 8°CRain 41%
Spring in Arcata has typical daily highs of about 12°C and lows of about 8°C, with a 41% chance of rain on a given day.
Arcata weather in summerJune to August
High 16°CLow 12°CRain 21%
Summer in Arcata has typical daily highs of about 16°C and lows of about 12°C, with a 21% chance of rain on a given day.
Arcata weather in autumnSeptember to November
High 15°CLow 9°CRain 35%
Autumn in Arcata has typical daily highs of about 15°C and lows of about 9°C, with a 35% chance of rain on a given day.
When is the rainy season in Arcata?
The rainy (wet) season in Arcata runs from October to May, peaking in January with a 49% chance of rain on a given day. The dry season is June to September; July is the driest month, at 20%.
What time of year is Arcata windiest?
Winds in Arcata are highest in March, averaging 3.1 m/s (11 km/h), and lightest in August, at 2.2 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Arcata year round?
The average temperature in Arcata over the whole year is 11°C. August is the hottest month, with highs of about 17°C; February is the coldest, with lows of about 6°C.