September weather forecastNummela, Finland
September
Weather in September
The first month of the autumn, September, is still a refreshing month in Nummela, Finland, with an average temperature ranging between max 15.1°C (59.2°F) and min 10.7°C (51.3°F).Temperature
Nummela's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's 19.7°C (67.5°F) to a still refreshing 15.1°C (59.2°F). During September, Nummela's nighttime temperatures demonstrate a subtle cooling from daytime highs, stabilizing at a fresh 10.7°C (51.3°F).Humidity
In September, the average relative humidity is 80%.Rainfall
In September, the rain falls for 15.7 days. Throughout September, 43mm (1.69") of precipitation is accumulated. Throughout the year, in Nummela, there are 154.9 rainfall days, and 500mm (19.69") of precipitation is accumulated.Snowfall
In Nummela, snow does not fall in June through September.Daylight
The average length of the day in September is 12h and 53min.On the first day of the month, sunrise is at 06:18 and sunset at 20:26. On the last day of September, sunrise is at 07:27 and sunset at 18:57 EEST.
Sunshine
In September, the average sunshine in Nummela is 7.5h.UV index
In September, the average daily maximum UV index is 3. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 3 in September translates into these instructions:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Minimize direct exposure to the Sun during midday when its radiation is at its peak. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Nummela, Finland
- Average high temperature in September: 15.1°C
The warmest month (with the highest average high temperature) is July (20.3°C).
The month with the lowest average high temperature is January (-2.1°C).
- Average low temperature in September: 10.7°C
The month with the highest average low temperature is July (14.3°C).
The coldest month (with the lowest average low temperature) is January (-5.7°C).
Average pressure in September
Nummela, Finland
- Average pressure in September: 1013.4mbar
The month with the highest atmospheric pressure is May (1014.9mbar).
The month with the lowest atmospheric pressure is December (1008.5mbar).
Average wind speed in September
Nummela, Finland
- Average wind speed in September: 16.1km/h
The windiest month (with the highest average wind speed) is December (20.1km/h).
The calmest month (with the lowest average wind speed) is May (13.2km/h).
Average humidity in September
Nummela, Finland
- Average humidity in September: 80%
The month with the highest relative humidity is February (91%).
The month with the lowest relative humidity is May (72%).
Average rainfall in September
Nummela, Finland
- Average rainfall in September: 43mm
The wettest months (with the highest rainfall) are July and October (52mm).
The driest month (with the least rainfall) is April (28mm).
Average rainfall days in September
Nummela, Finland
- Average rainfall days in September: 15.7 days
The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is February (6.8 days).
Average snowfall in September
Nummela, Finland
- Average snowfall in September: 0mm
The month with the highest snowfall is January (157mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days in September
Nummela, Finland
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (19 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Nummela, Finland
- Average daylight in September: 12h and 54min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 5h and 54min).
- Average sunshine in September: 7h and 30min
The month with the most sunshine is June (Average sunshine: 12h and 24min).
The month with the least sunshine is December (Average sunshine: 1h and 42min).
Average sunshine days in September
Nummela, Finland
- Average sunshine days in September: 11.3 days
The month with the most sunshine days is May (16.5 days).
The month with the least sunshine days is December (5.6 days).
Average UV index in September
Nummela, Finland
- Average UV index in September: 3
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March and December (UV index 1).
Average cloud cover in September
Nummela, Finland
- Average cloud cover in September: 46
The month with the most cloud cover is December (Cloud cover 75).
The months with the least cloud cover are July and August (Cloud cover 36).
Average visibility in September
Nummela, Finland
- Average visibility in September: 10km
The months with the highest visibility are June, July, August and September (10km).
The months with the lowest visibility are January, February, March and December (8km).
