Annual mean 10°C · wettest around April · prevailing wind W
Warmest
25.0 °C
Coldest
-2.2 °C
Wettest
16%
Windiest
4.0 m/s
Prevailing
W
3.3 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 10°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -3°C. Lewiston has no sharply defined rainy season: the chance of rain on a given day runs from 9% in July, the driest month, to 15% in April, the wettest. Winds in Lewiston are highest in January, averaging 3.4 m/s (12 km/h), and lightest in July, at 2.2 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 38% covered; January is the cloudiest month, at 73%.
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
-3°C
-8°C
12%
73%
3.4 m/s
0
0
1
February
-0°C
-2°C
-7°C
13%
64%
3.4 m/s
0
0
4
March
3°C
0°C
-3°C
12%
56%
3.3 m/s
1
0
10
April
9°C
5°C
4°C
15%
54%
3.0 m/s
7
0
32
May
16°C
11°C
13°C
12%
46%
2.4 m/s
38
7
64
June
22°C
17°C
20°C
11%
41%
2.4 m/s
70
22
63
July
25°C
20°C
25°C
9%
38%
2.2 m/s
70
50
34
August
24°C
19°C
24°C
9%
39%
2.2 m/s
73
47
38
September
21°C
16°C
20°C
9%
42%
2.3 m/s
69
21
65
October
14°C
11°C
11°C
15%
53%
2.8 m/s
30
2
61
November
7°C
4°C
1°C
13%
61%
3.2 m/s
4
0
21
December
2°C
0°C
-4°C
14%
72%
3.3 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 -3°C to 20°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around April 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 -0°CLow -2°CRain 13%
Winter in Lewiston has typical daily highs of about -0°C and lows of about -2°C, with a 13% chance of rain on a given day.
Lewiston weather in springMarch to May
High 9°CLow 5°CRain 13%
Spring in Lewiston has typical daily highs of about 9°C and lows of about 5°C, with a 13% chance of rain on a given day.
Lewiston weather in summerJune to August
High 24°CLow 19°CRain 10%
Summer in Lewiston has typical daily highs of about 24°C and lows of about 19°C, with a 10% chance of rain on a given day.
Lewiston weather in autumnSeptember to November
High 14°CLow 10°CRain 12%
Autumn in Lewiston has typical daily highs of about 14°C and lows of about 10°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 9% in July, the driest month, to 15% in April, the wettest.
What time of year is Lewiston windiest?
Winds in Lewiston are highest in January, averaging 3.4 m/s (12 km/h), and lightest in July, at 2.2 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 10°C. July is the hottest month, with highs of about 25°C; January is the coldest, with lows of about -3°C.