Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
September
Weather in September
Temperature
The arrival of September is marked by a minor reduction in average high-temperature, sliding from a refreshing 18.3°C (64.9°F) in August to a mild 15°C (59°F). Grimstad notes a consistent average low-temperature of 10.9°C (51.6°F) during September nights.Humidity
The average relative humidity in September in Grimstad is 79%.Rainfall
In September, in Grimstad, the rain falls for 14.8 days. Throughout September, 54mm (2.13") of precipitation is accumulated. In Grimstad, Norway, during the entire year, the rain falls for 152.2 days and collects up to 592mm (23.31") of precipitation.Snowfall
May through October are months without snowfall.Sea temperature
In September, the average sea temperature in Grimstad, Norway, is 15.9°C (60.6°F).Note: For most people, swimming in water at 15.9°C (60.6°F) is not a pleasurable experience. Breathing control gets harder as the water temperature descends from 21°C (69.8°F) to 15°C (59°F).
Daylight
In Grimstad, the average length of the day in September is 12h and 49min.On the first day of the month, sunrise is at 06:26 and sunset at 20:24. On the last day of September, sunrise is at 07:29 and sunset at 19:01 CEST.
Sunshine
In Grimstad, the average sunshine in September is 7.8h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index in Grimstad. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for average individuals.Note: During September, 4 as the daily maximum UV index converts into the following advice:
Take precautions - Protection against sun damage is advised. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Grimstad in September?
What is the average humidity in September in Grimstad?
How many days does it rain in September in Grimstad?
When it does not snow in Grimstad?
What is the sea water temperature in September in Grimstad?
What is the average length of the day in September in Grimstad?
When are sunrise and sunset in September in Grimstad?
How long on average sun shines in September in Grimstad?
What are the months with the highest UV index in Grimstad?
What is the UV index intensity in September in Grimstad?
Average temperature in September
Grimstad, Norway
- Average high temperature in September: 15°C
The warmest month (with the highest average high temperature) is July (19.1°C).
The month with the lowest average high temperature is February (1.6°C).
- Average low temperature in September: 10.9°C
The months with the highest average low temperature are July and August (13.2°C).
The coldest month (with the lowest average low temperature) is February (-1.6°C).
Average pressure in September
Grimstad, Norway
- Average pressure in September: 1013mbar
The month with the highest atmospheric pressure is April (1014.6mbar).
The month with the lowest atmospheric pressure is December (1007.8mbar).
Average wind speed in September
Grimstad, Norway
- Average wind speed in September: 18.5km/h
The windiest month (with the highest average wind speed) is November (21.5km/h).
The calmest month (with the lowest average wind speed) is June (16.1km/h).
Average humidity in September
Grimstad, Norway
- Average humidity in September: 79%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are May and June (71%).
Average rainfall in September
Grimstad, Norway
- Average rainfall in September: 54mm
The wettest months (with the highest rainfall) are October and November (65mm).
The driest month (with the least rainfall) is April (25mm).
Average rainfall days in September
Grimstad, Norway
- Average rainfall days in September: 14.8 days
The month with the highest number of rainy days is November (16.8 days).
The month with the least rainy days is February (8.7 days).
Average snowfall in September
Grimstad, Norway
- Average snowfall in September: 0mm
The month with the highest snowfall is January (106mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days in September
Grimstad, Norway
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Grimstad, Norway
- Average sea temperature in September: 15.9°C
The best month for swimming (with the highest average sea temperature) is August (18.2°C).
The coldest month (with the lowest average sea temperature) is March (3.4°C).
Average daylight in September /
Average sunshine in September
Grimstad, Norway
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 12min).
The month with the shortest days is December (Average daylight: 6h and 30min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is June (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).
Average sunshine days in September
Grimstad, Norway
- Average sunshine days in September: 11.3 days
The month with the most sunshine days is May (18.5 days).
The month with the least sunshine days is November (7.7 days).
Average UV index in September
Grimstad, Norway
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Grimstad, Norway
- Average cloud cover in September: 44
The month with the most cloud cover is November (Cloud cover 63).
The month with the least cloud cover is July (Cloud cover 35).
Average visibility in September
Grimstad, Norway
- Average visibility in September: 10km
The months with the highest visibility are April, May, June, July, August and September (10km).
The months with the lowest visibility are January, February, March, October, November and December (9km).
