Norway climate

Monthly averages for Oslo, 2021–2025

In Oslo, the warmest month is July, with an average high of 22°C, and the coldest is January, when nights average −6°C.

About 918 mm of rain falls in a year, on roughly 130 days. July is the wettest month (146 mm) and March the driest (45 mm).

Wind is strongest in October (11 km/h on average) and lightest in December (9 km/h).

Compared with Dublin, July afternoons are 3°C warmer, and January afternoons 9°C colder.

The hottest day in 2021–2025 reached 31.3°C (15 June 2023), and the coldest night fell to −27.2°C (6 January 2024).

Temperature

Bars run from the average night-time low to the average daytime high, in °C.

Average total rainfall each month, in millimetres.

Average wind speed at 10 metres each month, in km/h.

Oslo month by month
Month	High °C	Low °C	Rain mm	Rain days	Sun h/day	Wind km/h
January	−1	−6	77	10	2.8	10
February	2	−5	54	11	5.1	10
March	6	−2	45	8	7.5	9
April	11	2	49	8	10.2	10
May	17	7	64	11	12.3	10
June	21	12	85	11	13.5	10
July	22	14	146	14	12.0	9
August	21	13	95	12	10.4	10
September	17	10	95	11	7.5	9
October	11	5	84	12	4.8	11
November	5	1	66	11	2.4	10
December	1	−4	58	11	1.9	9