Annual mean 8°C · wettest around May · prevailing wind W
Warmest
25.4 °C
Coldest
-3.3 °C
Wettest
51%
Windiest
4.9 m/s
Prevailing
W
3.9 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 8°C. July is the hottest month, with highs of about 25°C; February is the coldest, with lows of about -7°C. Lewiston has no sharply defined rainy season: the chance of rain on a given day runs from 27% in September, the driest month, to 41% in May, the wettest. Winds in Lewiston are highest in March, averaging 3.4 m/s (12 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the W. The clearest skies in Lewiston come in July, when the sky is typically 31% covered; May is the cloudiest month, at 41%.
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
-2°C
-7°C
-9°C
28%
40%
3.2 m/s
0
0
1
February
-2°C
-7°C
-8°C
31%
38%
3.1 m/s
0
0
3
March
4°C
-2°C
-2°C
34%
38%
3.4 m/s
0
0
8
April
10°C
3°C
4°C
41%
39%
3.3 m/s
5
0
36
May
16°C
9°C
13°C
41%
41%
2.9 m/s
35
4
67
June
22°C
15°C
20°C
38%
35%
2.6 m/s
67
21
59
July
25°C
18°C
25°C
38%
31%
2.4 m/s
60
51
30
August
24°C
16°C
24°C
37%
32%
2.1 m/s
70
40
40
September
21°C
12°C
19°C
27%
32%
2.1 m/s
72
18
67
October
14°C
7°C
11°C
36%
41%
2.4 m/s
29
1
67
November
7°C
1°C
2°C
31%
36%
3.1 m/s
6
0
23
December
0°C
-4°C
-5°C
38%
40%
2.9 m/s
0
0
4
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 -2°C at their warmest in January, its coolest month, and 25°C in July, its warmest; the coolest hours of the day run from -7°C to 18°C through the year, and the average temperature over the year is 8°C around the clock. Rain is most likely around May and least likely around September. 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 -1°CLow -6°CRain 32%
Winter in Lewiston has typical daily highs of about -1°C and lows of about -6°C, with a 32% chance of rain on a given day.
Lewiston weather in springMarch to May
High 10°CLow 3°CRain 39%
Spring in Lewiston has typical daily highs of about 10°C and lows of about 3°C, with a 39% chance of rain on a given day.
Lewiston weather in summerJune to August
High 24°CLow 16°CRain 38%
Summer in Lewiston has typical daily highs of about 24°C and lows of about 16°C, with a 38% chance of rain on a given day.
Lewiston weather in autumnSeptember to November
High 14°CLow 7°CRain 31%
Autumn in Lewiston has typical daily highs of about 14°C and lows of about 7°C, with a 31% 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 27% in September, the driest month, to 41% in May, the wettest.
What time of year is Lewiston windiest?
Winds in Lewiston are highest in March, averaging 3.4 m/s (12 km/h), and lightest in August, at 2.1 m/s (8 km/h). The prevailing wind is from the W.
What is the average temperature in Lewiston year round?
The average temperature in Lewiston over the whole year is 8°C. July is the hottest month, with highs of about 25°C; February is the coldest, with lows of about -7°C.