Annual mean 11°C · wettest around November · prevailing wind SW
Warmest
23.4 °C
Coldest
5.8 °C
Wettest
38%
Windiest
3.5 m/s
Prevailing
SW
2.9 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 Fort Lewis over the whole year is 11°C. July is the hottest month, with highs of about 24°C; February is the coldest, with lows of about 3°C. The rainy (wet) season in Fort Lewis runs from September to April, peaking in November with a 38% chance of rain on a given day. The dry season is May to August; July is the driest month, at 10%. Winds in Fort Lewis are highest in February, averaging 2.5 m/s (9 km/h), and lightest in September, at 2.0 m/s (7 km/h). The prevailing wind is from the SW. The clearest skies in Fort Lewis come in July, when the sky is typically 36% covered; December is the cloudiest month, at 74%.
Month by month Fort Lewis 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
3°C
4°C
37%
73%
2.1 m/s
1
0
26
February
7°C
3°C
3°C
32%
71%
2.5 m/s
0
0
25
March
10°C
4°C
6°C
32%
62%
2.5 m/s
4
0
44
April
13°C
6°C
9°C
30%
56%
2.5 m/s
15
1
65
May
17°C
10°C
14°C
21%
55%
2.4 m/s
44
4
81
June
20°C
12°C
17°C
21%
52%
2.4 m/s
65
10
77
July
24°C
14°C
21°C
10%
36%
2.3 m/s
85
24
65
August
24°C
14°C
22°C
15%
37%
2.2 m/s
82
28
59
September
19°C
12°C
18°C
24%
48%
2.0 m/s
75
9
77
October
14°C
8°C
12°C
34%
57%
2.1 m/s
27
1
77
November
9°C
5°C
7°C
38%
68%
2.3 m/s
3
0
45
December
7°C
4°C
3°C
36%
74%
2.2 m/s
0
0
21
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 Fort Lewis weather by season
Year round, Fort Lewis has days of about 7°C at their warmest in December, its coolest month, and 24°C in July, 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 11°C around the clock. Rain is most likely around November 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.
Fort Lewis weather in winterDecember to February
High 7°CLow 3°CRain 35%
Winter in Fort Lewis has typical daily highs of about 7°C and lows of about 3°C, with a 35% chance of rain on a given day.
Fort Lewis weather in springMarch to May
High 13°CLow 6°CRain 28%
Spring in Fort Lewis has typical daily highs of about 13°C and lows of about 6°C, with a 28% chance of rain on a given day.
Fort Lewis weather in summerJune to August
High 23°CLow 14°CRain 15%
Summer in Fort Lewis has typical daily highs of about 23°C and lows of about 14°C, with a 15% chance of rain on a given day.
Fort Lewis weather in autumnSeptember to November
High 14°CLow 8°CRain 32%
Autumn in Fort Lewis has typical daily highs of about 14°C and lows of about 8°C, with a 32% chance of rain on a given day.
When is the rainy season in Fort Lewis?
The rainy (wet) season in Fort Lewis runs from September to April, peaking in November with a 38% chance of rain on a given day. The dry season is May to August; July is the driest month, at 10%.
What time of year is Fort Lewis windiest?
Winds in Fort Lewis are highest in February, averaging 2.5 m/s (9 km/h), and lightest in September, at 2.0 m/s (7 km/h). The prevailing wind is from the SW.
What is the average temperature in Fort Lewis year round?
The average temperature in Fort Lewis over the whole year is 11°C. July is the hottest month, with highs of about 24°C; February is the coldest, with lows of about 3°C.