Climate averages 1991–2020
Fredrikstad weather
in September.
A mild, moderately wet month: the 4th warmest and the joint 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Fredrikstad: daytime highs average 15.6°C and nights cool to about 10.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 81 mm of rain on roughly 11 days, which makes September a moderately wet month (the joint 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 55 min on an average September day.
The nearest other city in this atlas is Drammen (71 km away). In September its highs average 15.8°C, about as warm as Fredrikstad, with 94 mm of rain.
Among the 8 cities listed in Norway, Fredrikstad ranks 2nd of 8 for the warmest September highs and joint 1st of 8 for the driest September (rainfall, lowest first). The mean September high of those 8 cities is 15.0°C; Fredrikstad is 0.6°C warmer than that mean.
From September to October, average highs fall by 5.7°C to 10.0°C, and monthly rainfall rises from 81 mm to 87 mm.
The annual picture
September in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Fredrikstad climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.0°C-2.8°C | -2.8°C | 65 | 10.7 | 7.07 h |
| February | 1.4°C-3.0°C | -3.0°C | 51 | 8.6 | 9.29 h |
| March | 4.7°C-0.8°C | -0.8°C | 45 | 8.1 | 11.812 h |
| April | 9.7°C2.9°C | 2.9°C | 47 | 8.5 | 14.414 h |
| May | 14.7°C7.6°C | 7.6°C | 61 | 10.3 | 16.917 h |
| June | 18.3°C11.8°C | 11.8°C | 78 | 11.2 | 18.418 h |
| July | 20.5°C14.4°C | 14.4°C | 77 | 11.5 | 17.818 h |
| August | 19.7°C14.1°C | 14.1°C | 86 | 12.4 | 15.516 h |
| September, selected | 15.6°C10.6°C | 10.6°C | 81 | 10.5 | 12.913 h |
| October | 10.0°C6.0°C | 6.0°C | 87 | 11.6 | 10.310 h |
| November | 5.3°C2.2°C | 2.2°C | 81 | 11.9 | 7.88 h |
| December | 2.2°C-1.4°C | -1.4°C | 70 | 11.4 | 6.36 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Drammen in SeptemberNorway · 71 kmHigh 15.8°C · Low 9.7°C · 94 mm rain
- Oslo in SeptemberNorway · 78 kmHigh 15.5°C · Low 9.5°C · 89 mm rain
- Lillestrøm in SeptemberNorway · 82 kmHigh 15.0°C · Low 8.6°C · 81 mm rain
- Gothenburg in SeptemberSweden · 179 kmHigh 16.2°C · Low 10.6°C · 93 mm rain
- Borås in SeptemberSweden · 203 kmHigh 15.5°C · Low 9.7°C · 83 mm rain
- Kristiansand in SeptemberNorway · 207 kmHigh 15.4°C · Low 10.7°C · 127 mm rain
- Örebro in SeptemberSweden · 243 kmHigh 15.6°C · Low 9.4°C · 55 mm rain
- Jönköping in SeptemberSweden · 246 kmHigh 15.6°C · Low 10.2°C · 62 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Fredrikstad) is explained once on the Fredrikstad year overview and on the Sources, method and limits page.