Reykjavík has weather, not seasons. A summer afternoon can drop fifteen degrees in twenty minutes, and a January morning can clear into the kind of low pink light you cannot get anywhere else. The trick is to plan dates that survive sideways rain without becoming hostage situations indoors.
Start at a pool, end at a pool
The geothermal pools are the answer to almost every weather question in this city. They are outdoor, they are warm, and the worse the weather gets, the better they feel. Vesturbæjarlaug is the locals' choice in the west end, Sundhöll Reykjavíkur is the architectural one downtown on Barónsstígur with an indoor pool plus rooftop hot tubs, and Laugardalslaug in the east is the biggest with a slide and a steam bath.
A pool date is a real date. You sit in 40-degree water in horizontal rain with your face cold and your shoulders warm, and you talk. Entry is around 1,330 ISK. Bring flip flops and accept that you will need to shower naked in the changing rooms beforehand, which is non-negotiable and which everyone does. If your date balks at this, you have learned something useful.
Harpa, even without a concert
Harpa, the glass concert hall on the harbor designed by Olafur Eliasson, is free to walk into. The honeycomb glass facade looks different from every angle and the upper levels have benches facing the water. On a stormy afternoon it is one of the best rooms in the city to sit in for an hour without spending money. There is a cafe on the ground floor and a more serious restaurant called Kolabrautin upstairs if you want to extend.
The museum loop
The National Museum of Iceland on Suðurgata is underrated and tells you almost everything you need to know about why this country is the way it is. It takes about ninety minutes at a normal pace. From there you can walk five minutes to the Nordic House, designed by Alvar Aalto, which has a small Finnish-leaning library and a cafe with good cardamom buns.
The Reykjavík Art Museum has three locations. Hafnarhús, by the harbor, has the Erró collection and rotating contemporary shows. Kjarvalsstaðir, in Klambratún park, is good for landscape painting. One ticket gets you into all three on the same day for 2,100 ISK.
A long meal
When it is genuinely miserable outside, lean into a long meal. Snaps Bistro on Þórsgata is a glassed-in winter garden of a room and the moules frites are the unofficial Reykjavík rainy-Sunday lunch. Kaffi Vínyl on Hverfisgata is vegan, plays records, and lets you stay for hours. For something properly Icelandic, Messinn does pan-fried fish on Lækjargata and the lunch menu is around 2,990 ISK.
The bookstore move
Mál og Menning on Laugavegur has a cafe upstairs and chairs that nobody minds you sitting in. Eymundsson on Austurstræti is bigger and busier. Both are open late by Reykjavík standards, until ten. Picking out a book for each other to read is a better second-hour activity than it sounds.
When the rain breaks
Icelandic weather lies. If the rain pauses for twenty minutes, get outside immediately, because it might not pause again for a day. The walking path along Sæbraut, from Harpa east to the Höfði house where Reagan and Gorbachev met in 1986, is forty-five minutes round trip and gives you sea on one side and Esja in front. The light after a storm clears is the actual reason people move here.
What to wear
This matters more than where you go. A proper rain shell, not an umbrella, because umbrellas are useless in Reykjavík wind. Wool layer underneath. Boots that you do not mind getting wet. If your date shows up in a long wool coat and dress shoes, suggest the museum loop and the long meal, and skip the harbor walk.
The seasonal calendar
December and January are dark, with maybe four hours of usable daylight, and dates start earlier. February and March are when the snow is at its best and the Northern Lights season is still active. June and July there is no real night, which is disorienting and good for long walks. September is the most underrated month, mild and clear, and the aurora season has just started again. Plan accordingly.