Oslo in September
In September, Oslo averages 16°C (61°F) during the day and 10°C (49°F) at night, with frequent rain — about 17 days of the month see precipitation (97 mm total).
ShoulderConditions are cool — bring a jacket for evenings. Expect daily rain or showers, often in heavy bursts.
September is one of the wetter and less comfortable months in Oslo. If your dates are flexible, consider a different time of year.
How September compares to the rest of the year in Oslo
September is in the middle of the year for warmth in Oslo (4th of 12) and moderately rainy compared to the rest of the year (7th of 12). Daytime temperature runs 6°C above the annual average (10°C). September runs 4°C cooler than August (20°C) and cools 6°C in October (9°C).
September sunrise & sunset in Oslo
Times shown for Oslo local time (Europe/Oslo), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Oslo — September
Golden-hour and blue-hour windows for the 15th of September, in Oslo's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Oslo in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Oslo's popularity.
Crowds & pricing — September in Oslo
Oslo is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — September in Oslo
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Oslo in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 0°C / 31°F | -5°C / 23°F | 77 mm | 19 | — |
| February | 2°C / 35°F | -4°C / 25°F | 70 mm | 16 | — |
| March | 5°C / 41°F | -2°C / 28°F | 50 mm | 14 | — |
| April | 11°C / 51°F | 1°C / 35°F | 52 mm | 13 | — |
| May | 16°C / 60°F | 7°C / 44°F | 76 mm | 17 | — |
| June | 21°C / 69°F | 12°C / 53°F | 80 mm | 17 | — |
| July | 22°C / 71°F | 14°C / 56°F | 102 mm | 21 | — |
| August | 20°C / 68°F | 12°C / 54°F | 98 mm | 19 | — |
| September | 16°C / 61°F | 10°C / 49°F | 97 mm | 17 | — |
| October | 9°C / 49°F | 5°C / 40°F | 99 mm | 19 | — |
| November | 4°C / 39°F | 0°C / 33°F | 86 mm | 17 | — |
| December | 1°C / 33°F | -4°C / 25°F | 66 mm | 17 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Oslo in September →
Frequently asked questions
How hot is Oslo in September?
In September, Oslo averages a high of 16°C (61°F) and a low of 10°C (49°F) — generally cool.
Does it rain a lot in Oslo in September?
September is quite rainy in Oslo, with about 17 rainy days on average.
Is September a good time to visit Oslo?
September is cool but on the rainy side. It suits travelers who are comfortable with cool weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Oslo in September?
Pack a warm jacket and layers, plus a compact umbrella or rain jacket. See the full September packing list for Oslo for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.