Guerneville · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Guerneville & neighbors — hit play
Every city on the map carries real forecast data from the same models as its city page, refreshed several times a day. The icon is the day's overall look; the number is the afternoon high.
Next 14 days at a glance
from the model forecast
Hottest day
88°
Wed, Sep 16
Coldest night
47°
Sat, Sep 5
Days with precip
1 / 14
of 14 forecast days
Nicest day
Sat, Sep 5
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
76° 47°
5% precip chance
Sat 12 – Sun 13 Sep
83° 50°
6% precip chance
Sat 19 – Sun 20 Sep
83° 52°
typical range
Sat 26 – Sun 27 Sep
85° 51°
typical range
30 days — Guerneville
14 forecast + 16 climatology
Thu · Today Fog
67°52°7.7 mm⌄
Wind8 mph W
Gusts15 mph
UV index2 – Low
Precip chance86%
Sunrise06:43
Sunset19:39
Fri · Tomorrow Sunny
75°47°5%⌄
Wind13 mph W
Gusts24 mph
UV index7 – High
Precip chance5%
Sunrise06:44
Sunset19:37
Saturday 5/9 Sunny
73°47°5%⌄
Wind10 mph SW
Gusts19 mph
UV index7 – High
Precip chance5%
Sunrise06:44
Sunset19:36
Sunday 6/9 Sunny
76°48°3%⌄
Wind9 mph SW
Gusts20 mph
UV index7 – High
Precip chance3%
Sunrise06:45
Sunset19:34
Monday 7/9 Sunny
82°48°3%⌄
Wind7 mph S
Gusts18 mph
UV index7 – High
Precip chance3%
Sunrise06:46
Sunset19:33
Tuesday 8/9 Mostly cloudy
80°52°6%⌄
Wind7 mph SW
Gusts14 mph
UV index6 – High
Precip chance6%
Sunrise06:47
Sunset19:31
Wednesday 9/9 Sunny
76°50°8%⌄
Wind8 mph SW
Gusts14 mph
UV index6 – High
Precip chance8%
Sunrise06:48
Sunset19:30
Thursday 10/9 Sunny
74°50°9%⌄
Wind9 mph S
Gusts20 mph
UV index6 – High
Precip chance9%
Sunrise06:49
Sunset19:28
Friday 11/9 Sunny
78°50°7%⌄
Wind10 mph W
Gusts13 mph
UV index7 – High
Precip chance7%
Sunrise06:50
Sunset19:27
Saturday 12/9 Sunny
79°51°6%⌄
Wind9 mph SW
Gusts21 mph
UV index7 – High
Precip chance6%
Sunrise06:51
Sunset19:25
Sunday 13/9 Sunny
83°50°2%⌄
Wind7 mph S
Gusts14 mph
UV index7 – High
Precip chance2%
Sunrise06:51
Sunset19:23
Monday 14/9 Sunny
85°55°1%⌄
Wind8 mph SW
Gusts15 mph
UV index7 – High
Precip chance1%
Sunrise06:52
Sunset19:22
Tuesday 15/9 Mostly cloudy
81°55°9%⌄
Wind6 mph S
Gusts15 mph
UV index6 – High
Precip chance9%
Sunrise06:53
Sunset19:20
Wednesday 16/9 Sunny
88°55°2%⌄
Wind6 mph S
Gusts17 mph
UV index8 – Very high
Precip chance2%
Sunrise06:54
Sunset19:19
Thursday 17/9 Light rain (climatological)
79°51°1.0 mm⌄
Day≈73–84°
Night≈46–56°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 18/9 Partly cloudy (climatological)
80°52°20%⌄
Day≈74–85°
Night≈46–57°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
81°52°20%⌄
Day≈76–87°
Night≈47–58°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Light rain (climatological)
83°54°1.8 mm⌄
Day≈78–89°
Night≈48–59°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Partly cloudy (climatological)
79°51°20%⌄
Day≈73–84°
Night≈46–56°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
76°49°20%⌄
Day≈70–81°
Night≈44–54°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Light rain (climatological)
77°50°1.6 mm⌄
Day≈72–83°
Night≈45–56°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Partly cloudy (climatological)
76°49°20%⌄
Day≈70–81°
Night≈44–55°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
81°52°20%⌄
Day≈76–87°
Night≈47–58°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Light rain (climatological)
85°55°1.6 mm⌄
Day≈80–91°
Night≈50–60°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Partly cloudy (climatological)
80°51°20%⌄
Day≈74–85°
Night≈46–57°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
75°48°20%⌄
Day≈69–80°
Night≈43–54°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Light rain (climatological)
71°46°2.0 mm⌄
Day≈66–77°
Night≈41–52°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Partly cloudy (climatological)
74°48°20%⌄
Day≈69–80°
Night≈43–54°
Precip≈0.7 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
66°40°20%⌄
Day≈61–72°
Night≈35–45°
Precip≈0.7 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Light rain (climatological)
70°42°1.9 mm⌄
Day≈65–75°
Night≈37–47°
Precip≈0.7 in / October
(climatological)Typical range for these dates · 1991–2020
How does a 30-day outlook work?
The first 14 days are a live model forecast. The back half of the month shows the typical range for those dates — useful for planning, not a literal prediction.
First 14 days: a real forecast, blended from NBM, ECMWF and GFS runs. Trust it most inside three days; by the second week treat it as a lean, not a promise.
Rest of the month: past day 14 we stop pretending to forecast and switch to the climate corridor — the range those dates have produced over three decades computed directly for Guerneville, with mild week-to-week wiggle.
Good question for this page: "Is late August usually humid in Chicago?" Bad question: "Do I need an umbrella on the 29th?" — three weeks out no one knows, and that's the honest answer.