30-day forecast · Sundsvall
Days 1-14 are a real forecast from global weather models. Days 15-30 are season-typical values based on SMHI climate normals 1991-2020 — good for planning, NOT an exact forecast that far ahead.
30 days — Sundsvall 14 real + 16 synthesised
Scroll sideways · tap a day for details
Day by day — Sundsvall 30 days
Thu · Today
Clear
+15°
+8°
7%
⌄
Wind 6 m/s W
Gusts 13 m/s
UV index 4 – Moderate
Chance of rain 7%
Sunrise 06:21
Sunset 19:08
Fri · Tomorrow
Cloudy
+14°
+8°
2.1 mm
⌄
Wind 3 m/s SW
Gusts 8 m/s
UV index 3 – Moderate
Chance of rain 76%
Sunrise 06:24
Sunset 19:05
Saturday 19/9
Cloudy
+16°
+6°
14.0 mm
⌄
Wind 4 m/s S
Gusts 10 m/s
UV index 4 – Moderate
Chance of rain 81%
Sunrise 06:26
Sunset 19:02
Sunday 20/9
Clear
+15°
+8°
0.3 mm
⌄
Wind 5 m/s W
Gusts 13 m/s
UV index 4 – Moderate
Chance of rain 29%
Sunrise 06:29
Sunset 18:58
Monday 21/9
Clear
+16°
+8°
9%
⌄
Wind 6 m/s NW
Gusts 13 m/s
UV index 5 – Moderate
Chance of rain 9%
Sunrise 06:32
Sunset 18:55
Tuesday 22/9
Partly cloudy
+14°
+8°
20%
⌄
Wind 5 m/s NW
Gusts 14 m/s
UV index 4 – Moderate
Chance of rain 20%
Sunrise 06:34
Sunset 18:52
Wednesday 23/9
Partly cloudy
+14°
+8°
19%
⌄
Wind 6 m/s NW
Gusts 13 m/s
UV index 4 – Moderate
Chance of rain 19%
Sunrise 06:37
Sunset 18:48
Thursday 24/9
Clear
+13°
+7°
5%
⌄
Wind 7 m/s NW
Gusts 14 m/s
UV index 4 – Moderate
Chance of rain 5%
Sunrise 06:40
Sunset 18:45
Friday 25/9
Clear
+13°
+6°
6%
⌄
Wind 6 m/s NW
Gusts 15 m/s
UV index 4 – Moderate
Chance of rain 6%
Sunrise 06:42
Sunset 18:42
Saturday 26/9
Clear
+15°
+5°
7%
⌄
Wind 3 m/s NW
Gusts 7 m/s
UV index 4 – Moderate
Chance of rain 7%
Sunrise 06:45
Sunset 18:38
Sunday 27/9
Cloudy
+16°
+6°
7%
⌄
Wind 3 m/s NW
Gusts 7 m/s
UV index 4 – Moderate
Chance of rain 7%
Sunrise 06:47
Sunset 18:35
Monday 28/9
Clear
+14°
+7°
9%
⌄
Wind 2 m/s NW
Gusts 6 m/s
UV index 4 – Moderate
Chance of rain 9%
Sunrise 06:50
Sunset 18:32
Tuesday 29/9
Clear
+14°
+5°
9%
⌄
Wind 3 m/s N
Gusts 6 m/s
UV index 4 – Moderate
Chance of rain 9%
Sunrise 06:53
Sunset 18:28
Wednesday 30/9
Cloudy
+12°
+5°
15%
⌄
Wind 2 m/s SE
Gusts 6 m/s
UV index 4 – Moderate
Chance of rain 15%
Sunrise 06:55
Sunset 18:25
Thursday 1/10
Rain (climate normal)
+6°
+1°
4.9 mm
⌄
Daytime ≈3–9°
At night ≈-2–4°
Rain 4.9 mm
(climate normal) Typical range for the season · 1991–2020
Friday 2/10
Partly cloudy (climate normal)
+8°
+3°
20%
⌄
Daytime ≈5–11°
At night ≈0–6°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Saturday 3/10
Partly cloudy (climate normal)
+8°
+3°
20%
⌄
Daytime ≈5–11°
At night ≈0–6°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Sunday 4/10
Rain (climate normal)
+8°
+3°
4.4 mm
⌄
Daytime ≈5–11°
At night ≈0–6°
Rain 4.4 mm
(climate normal) Typical range for the season · 1991–2020
Monday 5/10
Partly cloudy (climate normal)
+7°
+2°
20%
⌄
Daytime ≈4–10°
At night ≈-1–5°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Tuesday 6/10
Partly cloudy (climate normal)
+5°
+1°
20%
⌄
Daytime ≈2–8°
At night ≈-2–4°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Wednesday 7/10
Rain (climate normal)
+5°
+1°
6.8 mm
⌄
Daytime ≈2–8°
At night ≈-2–4°
Rain 6.8 mm
(climate normal) Typical range for the season · 1991–2020
Thursday 8/10
Partly cloudy (climate normal)
+9°
+3°
20%
⌄
Daytime ≈6–12°
At night ≈0–6°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Friday 9/10
Partly cloudy (climate normal)
+10°
+4°
20%
⌄
Daytime ≈7–13°
At night ≈1–7°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Saturday 10/10
Rain (climate normal)
+10°
+4°
9.1 mm
⌄
Daytime ≈7–13°
At night ≈1–7°
Rain 9.1 mm
(climate normal) Typical range for the season · 1991–2020
Sunday 11/10
Partly cloudy (climate normal)
+9°
+3°
20%
⌄
Daytime ≈6–12°
At night ≈0–6°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Monday 12/10
Partly cloudy (climate normal)
+7°
+2°
20%
⌄
Daytime ≈4–10°
At night ≈-1–5°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Tuesday 13/10
Rain (climate normal)
+4°
0°
6.8 mm
⌄
Daytime ≈1–7°
At night ≈-3–3°
Rain 6.8 mm
(climate normal) Typical range for the season · 1991–2020
Wednesday 14/10
Partly cloudy (climate normal)
+4°
0°
20%
⌄
Daytime ≈1–7°
At night ≈-3–3°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Thursday 15/10
Partly cloudy (climate normal)
+7°
+2°
20%
⌄
Daytime ≈4–10°
At night ≈-1–5°
Rain 20%
(climate normal) Typical range for the season · 1991–2020
Friday 16/10
Rain (climate normal)
+8°
+3°
8.6 mm
⌄
Daytime ≈5–11°
At night ≈0–6°
Rain 8.6 mm
(climate normal) Typical range for the season · 1991–2020
🗺️ Map — Sundsvall and around
Forecast day by day
📅 Forecast
🌧️ Radar now
▶
Markers show the daily high for Sundsvall and the places around it — all from our warm cache, the map makes no calls of its own. Radar mode fetches frames from RainViewer.
How does the long-range forecast work?
Days 1-14: Fetched live from global weather models (ECMWF, GFS) with statistical correction. Reliability ~85% for days 1-3, ~60% for days 7-10, ~45% for days 11-14.
Days 15-30: A real forecast does not exist that far ahead (a chaotic system). Instead we show season-typical values: the month’s average Tmax/Tmin from SMHI climate normals 1991-2020 directly for Sundsvall, with mild weekly variation.
Use: "Roughly how warm is it usually in Stockholm in the last week of July?" — a good question for days 15-30. "Will it rain on 27 May?" — no serious forecast can say.