Norrtälje weather in May

In May, Norrtälje sees average daytime highs of 13°C and overnight lows near 5°C, with 39 mm of precipitation across 8.5 wet days and about 16.7 hours of daylight. It is the 5th-warmest and 8th-wettest month of the year here.

Highs climb over the month, from about 11°C in the first days to 15°C by the end. The sky is clear or mostly clear about 31% of the time in May, and the air most often feels dry.

Daylight stretches from about 15 h 30 min at the start of May to 17 h 42 min by month's end. Set against the rest of the year, May is Norrtälje's 1st-clearest and 9th-windiest month. For the whole year in context, see Norrtälje's year-round climate.

Daytime high
13°
5th warmest
Overnight low
8th coldest
Precipitation
39 mm
8.5 wet days
Daylight
16 h 42 min
3:19 AM – 8:04 PM
Cloud cover
58%
1st clearest
Wind
13 km/h
9th windiest
Solar energy
5.58 kWh/m²
Travel score
3.8
out of 10

Norrtälje is urban area in Norrtälje Municipality, Sweden.

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 11°C in the first days to 15°C by the end.

A typical May day in Norrtälje reaches about 13°C in the afternoon and slips back to 5°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 18°C. Set against its neighbours, May runs about 5°C warmer than April and about 4°C cooler than June.

10°15°20°25°151015202531
Avg high (°C)Avg low (°C)
1113
2113
3114
4114
5114
6114
7124
8124
9124
10125
11125
12125
13125
14135
15135
16135
17136
18136
19136
20146
21146
22146
23147
24147
25147
26157
27157
28157
29158
30158
31158

How May really feels in Norrtälje

Once humidity and wind are folded in, May averages 0 days that feel above 32°C and 1 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
1
wind chill below the day's low

The story in May is cold — wind chill drags the overnight "feels like" below the raw low.

Norrtälje weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 8th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan / -3°368.66.56.50.0
Feb / -4°297.378.70.0
Mar / -2°297.4511.30.0
Apr / 317.8214.11.4
May13° / 398.50.116.73.8
Jun17° / 10°5910018.25.5
Jul20° / 13°6210.2017.66.4
Aug20° / 13°6411.5015.36.0
Sep15° / 509012.64.6
Oct10° / 509.70.39.82.0
Nov / 4910.73.17.20.2
Dec / -2°4610.86.45.80.0

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 31% of the time in May, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 19% of May, with mostly cloudy or overcast conditions the remaining 50%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14951
24951
34951
45050
55050
65050
75149
85149
95149
105149
115050
125149
135149
145050
155050
165050
174852
184852
194852
204753
214852
224852
234852
244852
254951
264951
274951
285050
295050
305050
315149

Chance of precipitation in May

Any precipitationSnow

Norrtälje gets around 39 mm of rain and snow over 8.5 wet days in May. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 27% and peaks near 28% on the wettest days, and about 0 day brings snow.

0%10%20%30%40%151015202531
Rain chance (%)Snow chance (%)
1272
2272
3271
4271
5271
6271
7271
8271
9271
10270
11270
12270
13270
14270
15270
16270
17270
18270
19270
20280
21280
22280
23280
24280
25280
26280
27270
28270
29270
30270
31270

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

Most of May feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, May lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
27991
28991
29991
30991
31991

Wind in May

Winds average 13 km/h in May.

Across May, daily wind ranges from about 13 km/h on the calmest days to 14 km/h at its breeziest. It stays fairly steady from day to day.

05101520151015202531
Wind speed (km/h)Feels
114light breeze
214light breeze
314light breeze
414light breeze
514light breeze
614light breeze
714light breeze
814light breeze
913light breeze
1013light breeze
1113light breeze
1213light breeze
1313light breeze
1413light breeze
1513light breeze
1613light breeze
1713light breeze
1813light breeze
1913light breeze
2013light breeze
2113light breeze
2213light breeze
2313light breeze
2413light breeze
2513light breeze
2613light breeze
2713light breeze
2813light breeze
2913light breeze
3013light breeze
3113light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 15 h 30 min at the start of May to 17 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 132 minutes over May. Sunrise moves from 3:57 AM to 2:50 AM, and sunset from 7:28 PM to 8:35 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
115.53:577:28
215.63:547:30
315.73:527:33
415.83:497:35
515.93:467:38
615.93:447:40
716.03:417:42
816.13:397:45
916.23:367:47
1016.33:347:50
1116.33:317:52
1216.43:297:54
1316.53:267:57
1416.63:247:59
1516.73:228:01
1616.73:198:04
1716.83:178:06
1816.93:158:08
1917.03:138:10
2017.03:108:13
2117.13:088:15
2217.23:068:17
2317.23:048:19
2417.33:028:21
2517.43:018:23
2617.42:598:25
2717.52:578:27
2817.62:558:29
2917.62:548:31
3017.72:528:33
3117.72:508:35

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 5.58 kWh/m².

For context, solar energy here swings from a low near 0.19 kWh/m² to a high of 5.93 kWh/m² in June across the year — May's 5.58 kWh/m² sits near the top of that range.

0246151015202531
Solar energy (kWh/m²)Level
15.0Bright
25.0Bright
35.1Bright
45.1Bright
55.2Bright
65.2Bright
75.3Bright
85.3Bright
95.4Bright
105.4Bright
115.5Bright
125.5Bright
135.5Bright
145.6Bright
155.6Bright
165.6Bright
175.7Bright
185.7Bright
195.7Bright
205.7Bright
215.8Bright
225.8Bright
235.8Bright
245.8Bright
255.9Bright
265.9Bright
275.9Bright
285.9Bright
296.0Bright
306.0Bright
316.0Bright
Planning a trip in May

Is May a good time to visit Norrtälje?

Our two travel scores rate May for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

3.8
Sightseeing
5th-best month of the year
0.0
Beach & pool
5th-best month of the year

May is a weaker month for outdoor sightseeing in Norrtälje.

What to pack for Norrtälje in May

From May's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In May, Norrtälje sees daytime highs around 13°C and nights near 5°C. Worth packing: a warm layer, rain gear and sun protection. About 9 days see rain.

a warm layerrain gearsun protection

Sea temperature near Norrtälje in May

The nearest coast averages about 6°C in May — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 18 km away) is warmest in August at about 17°C and coldest in February near 1°C.

The water stays below 20°C all year — cool enough that most swimmers want a wetsuit.

0°5°10°15°20°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°C)Comfort
Jan3Bracing
Feb1Bracing
Mar2Bracing
Apr3Bracing
May6Bracing
Jun11Bracing
Jul16Cool
Aug17Cool
Sep14Bracing
Oct10Bracing
Nov7Bracing
Dec4Bracing

UV index in Norrtälje in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Norrtälje peaks around June 17 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateLowJun 17UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr3Moderate
May4Moderate
Jun5Moderate
Jul5Moderate
Aug4Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low
Location & terrain

Where is Norrtälje?

Norrtälje sits at 59.8°N, 18.7°E, 13 m above sea level, in Sweden. The nearest listed city is Åkersberga, 38 km away.

Topography around Norrtälje

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Norrtälje.

Within 3 km, the terrain around Norrtälje has only modest variations in elevation — a maximum elevation change of 51 m around an average of 17 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 68 m; within 80 km, only modest variations in elevation — a maximum elevation change of 111 m.

The land around Norrtälje is covered by trees (43%) and grassland (23%) within 3 km, trees (61%) within 16 km, and water (53%) and trees (35%) within 80 km.

3 km
51 m
16 km
68 m
80 km
111 m
treesgrasslandcroplandartificial surfaceswaterwetland
May weather nearby: Åkersberga 38 km · Vallentuna 43 km · Täby 50 km · Märsta 50 km · Gustavsberg 51 km · Upplands Väsby 52 km · Boo 53 km · Lidingö 54 km

Sweden travel facts

Travel advisory
Level 2
Exercise Increased Caution
Power plugs
Type C / F
230 V · 50 Hz
Prices
≈ 87% of US
price level, 2025
GDP per capita
$63,133
2025
Happiness
7.3 / 10
World Happiness, 2025
Safe drinking water
100%
of population, 2024
Homicide rate
1.1
per 100k, 2023
Road deaths
3.1
per 100k/yr, 2019
Income group
High
World Bank
English
Very high
EF EPI 609
Religion
Church of Sweden 54%none or unspecified 37%other 9%

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Norrtälje (59.758°, 18.705°, elevation 13 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).