Annual mean 11°C · wettest around February · prevailing wind N
Warmest
30.8 °C
Coldest
2.0 °C
Wettest
20%
Windiest
4.3 m/s
Prevailing
N
3.0 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Lewiston over the whole year is 11°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -0°C. Lewiston has no sharply defined rainy season: the chance of rain on a given day runs from 7% in July, the driest month, to 17% in February, the wettest. Winds in Lewiston are highest in February, averaging 2.9 m/s (10 km/h), and lightest in September, at 1.9 m/s (7 km/h). The prevailing wind is from the N. The clearest skies in Lewiston come in July, when the sky is typically 9% covered; December is the cloudiest month, at 65%.
Month by month Lewiston 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
3°C
-0°C
-2°C
14%
61%
2.6 m/s
0
0
6
February
4°C
-0°C
-1°C
17%
61%
2.9 m/s
0
0
15
March
9°C
2°C
5°C
13%
49%
2.6 m/s
3
0
42
April
14°C
6°C
10°C
14%
43%
2.7 m/s
23
0
68
May
19°C
11°C
16°C
12%
35%
2.6 m/s
58
11
75
June
24°C
15°C
21°C
11%
26%
2.5 m/s
67
33
57
July
30°C
18°C
27°C
7%
9%
2.3 m/s
52
65
24
August
29°C
17°C
26°C
8%
12%
2.2 m/s
57
59
29
September
22°C
12°C
20°C
10%
26%
1.9 m/s
76
23
68
October
14°C
7°C
11°C
12%
37%
2.1 m/s
31
1
75
November
7°C
3°C
3°C
14%
51%
2.5 m/s
2
0
30
December
3°C
-0°C
-2°C
16%
65%
2.6 m/s
0
0
8
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 Lewiston weather by season
Year round, Lewiston has days of about 3°C at their warmest in December, its coolest month, and 30°C in July, its warmest; the coolest hours of the day run from -0°C to 18°C through the year, and the average temperature over the year is 11°C around the clock. Rain is most likely around February 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.
Lewiston weather in winterDecember to February
High 3°CLow -0°CRain 16%
Winter in Lewiston has typical daily highs of about 3°C and lows of about -0°C, with a 16% chance of rain on a given day.
Lewiston weather in springMarch to May
High 14°CLow 6°CRain 13%
Spring in Lewiston has typical daily highs of about 14°C and lows of about 6°C, with a 13% chance of rain on a given day.
Lewiston weather in summerJune to August
High 28°CLow 17°CRain 9%
Summer in Lewiston has typical daily highs of about 28°C and lows of about 17°C, with a 9% chance of rain on a given day.
Lewiston weather in autumnSeptember to November
High 15°CLow 7°CRain 12%
Autumn in Lewiston has typical daily highs of about 15°C and lows of about 7°C, with a 12% chance of rain on a given day.
When is the rainy season in Lewiston?
Lewiston has no sharply defined rainy season: the chance of rain on a given day runs from 7% in July, the driest month, to 17% in February, the wettest.
What time of year is Lewiston windiest?
Winds in Lewiston are highest in February, averaging 2.9 m/s (10 km/h), and lightest in September, at 1.9 m/s (7 km/h). The prevailing wind is from the N.
What is the average temperature in Lewiston year round?
The average temperature in Lewiston over the whole year is 11°C. July is the hottest month, with highs of about 30°C; January is the coldest, with lows of about -0°C.