Annual mean 5°C · wettest around February · prevailing wind SW
Warmest
21.0 °C
Coldest
-7.6 °C
Wettest
29%
Windiest
4.8 m/s
Prevailing
SW
4.1 m/s average
When this place is good five ratings · thirty-six ten-day sections · click a cell to read it
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 Jämsä over the whole year is 5°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about -6°C. The rainy (wet) season in Jämsä runs from October to March, peaking in February with a 27% chance of rain on a given day. The dry season is April to September; May is the driest month, at 12%. Winds in Jämsä are highest in January, averaging 3.7 m/s (13 km/h), and lightest in July, at 3.1 m/s (11 km/h). The prevailing wind is from the SW. The clearest skies in Jämsä come in June, when the sky is typically 51% covered; November is the cloudiest month, at 88%.
Month by month Jämsä 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
-6°C
-6°C
-11°C
27%
82%
3.7 m/s
0
0
0
February
-4°C
-6°C
-10°C
27%
79%
3.7 m/s
0
0
0
March
0°C
-4°C
-6°C
21%
67%
3.6 m/s
0
0
1
April
6°C
-1°C
0°C
16%
61%
3.4 m/s
0
0
12
May
13°C
6°C
8°C
12%
56%
3.3 m/s
20
0
52
June
19°C
13°C
15°C
15%
51%
3.4 m/s
46
5
73
July
20°C
15°C
17°C
16%
53%
3.1 m/s
63
13
71
August
18°C
13°C
16°C
15%
58%
3.3 m/s
61
3
81
September
13°C
9°C
10°C
18%
67%
3.3 m/s
18
0
66
October
6°C
4°C
2°C
22%
80%
3.7 m/s
0
0
20
November
1°C
0°C
-4°C
26%
88%
3.7 m/s
0
0
2
December
-3°C
-3°C
-8°C
24%
87%
3.7 m/s
0
0
0
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 Jämsä weather by season
Year round, Jämsä has days of about -6°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from -6°C to 15°C through the year, and the average temperature over the year is 5°C around the clock. Rain is most likely around February and least likely around May. 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.
Jämsä weather in winterDecember to February
High -4°CLow -5°CRain 26%
Winter in Jämsä has typical daily highs of about -4°C and lows of about -5°C, with a 26% chance of rain on a given day.
Jämsä weather in springMarch to May
High 6°CLow 0°CRain 16%
Spring in Jämsä has typical daily highs of about 6°C and lows of about 0°C, with a 16% chance of rain on a given day.
Jämsä weather in summerJune to August
High 19°CLow 14°CRain 16%
Summer in Jämsä has typical daily highs of about 19°C and lows of about 14°C, with a 16% chance of rain on a given day.
Jämsä weather in autumnSeptember to November
High 7°CLow 4°CRain 22%
Autumn in Jämsä has typical daily highs of about 7°C and lows of about 4°C, with a 22% chance of rain on a given day.
When is the rainy season in Jämsä?
The rainy (wet) season in Jämsä runs from October to March, peaking in February with a 27% chance of rain on a given day. The dry season is April to September; May is the driest month, at 12%.
What time of year is Jämsä windiest?
Winds in Jämsä are highest in January, averaging 3.7 m/s (13 km/h), and lightest in July, at 3.1 m/s (11 km/h). The prevailing wind is from the SW.
What is the average temperature in Jämsä year round?
The average temperature in Jämsä over the whole year is 5°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about -6°C.