Harleysville · first 14 days — live forecast · rest of month — climate corridor
🗺️ 14-day forecast map
Harleysville & 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°
Fri, Sep 4
Coldest night
46°
Tue, Sep 15
Days with precip
2 / 14
of 14 forecast days
Nicest day
Sat, Sep 12
mild, dry, light wind
The next 4 weekends
plan ahead
Sat 5 – Sun 6 Sep
79° 59°
36% precip chance
Sat 12 – Sun 13 Sep
71° 49°
83% precip chance
Sat 19 – Sun 20 Sep
78° 58°
typical range
Sat 26 – Sun 27 Sep
79° 58°
typical range
30 days — Harleysville
14 forecast + 16 climatology
Fri · Today Showers
88°71°3.0 mm⌄
Wind10 mph NW
Gusts26 mph
UV index5 – Moderate
Precip chance70%
Sunrise06:32
Sunset19:29
Sat · Tomorrow Mostly cloudy
79°66°0.3 mm⌄
Wind13 mph NE
Gusts27 mph
UV index6 – High
Precip chance36%
Sunrise06:33
Sunset19:27
Sunday 6/9 Sunny
73°59°0.1 mm⌄
Wind9 mph NE
Gusts18 mph
UV index6 – High
Precip chance18%
Sunrise06:34
Sunset19:26
Monday 7/9 Sunny
76°58°4%⌄
Wind6 mph N
Gusts17 mph
UV index6 – High
Precip chance4%
Sunrise06:35
Sunset19:24
Tuesday 8/9 Mostly cloudy
79°58°12%⌄
Wind7 mph SW
Gusts16 mph
UV index7 – High
Precip chance12%
Sunrise06:36
Sunset19:22
Wednesday 9/9 Sunny
82°64°7%⌄
Wind14 mph SW
Gusts38 mph
UV index7 – High
Precip chance7%
Sunrise06:36
Sunset19:21
Thursday 10/9 Sunny
77°58°4%⌄
Wind19 mph NW
Gusts38 mph
UV index6 – High
Precip chance4%
Sunrise06:37
Sunset19:19
Friday 11/9 Mostly cloudy
68°50°11%⌄
Wind9 mph NW
Gusts19 mph
UV index5 – Moderate
Precip chance11%
Sunrise06:38
Sunset19:17
Saturday 12/9 Partly cloudy
71°49°8%⌄
Wind7 mph SW
Gusts11 mph
UV index6 – High
Precip chance8%
Sunrise06:39
Sunset19:16
Sunday 13/9 Showers
62°56°3.8 mm⌄
Wind6 mph NE
Gusts14 mph
UV index4 – Moderate
Precip chance83%
Sunrise06:40
Sunset19:14
Monday 14/9 Sunny
69°52°18%⌄
Wind13 mph NW
Gusts23 mph
UV index5 – Moderate
Precip chance18%
Sunrise06:41
Sunset19:12
Tuesday 15/9 Sunny
67°46°3%⌄
Wind9 mph N
Gusts19 mph
UV index5 – Moderate
Precip chance3%
Sunrise06:42
Sunset19:11
Wednesday 16/9 Partly cloudy
84°49°12%⌄
Wind5 mph E
Gusts13 mph
UV index7 – High
Precip chance12%
Sunrise06:43
Sunset19:09
Thursday 17/9 Sunny
84°67°11%⌄
Wind7 mph S
Gusts13 mph
UV index7 – High
Precip chance11%
Sunrise06:44
Sunset19:07
Friday 18/9 Rain (climatological)
74°57°2.1 mm⌄
Day≈69–80°
Night≈51–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 19/9 Partly cloudy (climatological)
77°58°20%⌄
Day≈72–83°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 20/9 Partly cloudy (climatological)
78°59°20%⌄
Day≈73–84°
Night≈54–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 21/9 Light rain (climatological)
80°60°1.6 mm⌄
Day≈74–85°
Night≈55–65°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 22/9 Partly cloudy (climatological)
74°56°20%⌄
Day≈68–79°
Night≈51–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 23/9 Partly cloudy (climatological)
73°56°20%⌄
Day≈67–78°
Night≈50–61°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 24/9 Light rain (climatological)
70°54°1.2 mm⌄
Day≈64–75°
Night≈49–59°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Friday 25/9 Partly cloudy (climatological)
75°57°20%⌄
Day≈69–80°
Night≈52–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Saturday 26/9 Partly cloudy (climatological)
78°58°20%⌄
Day≈72–83°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Sunday 27/9 Light rain (climatological)
79°59°1.9 mm⌄
Day≈73–84°
Night≈54–65°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Monday 28/9 Partly cloudy (climatological)
77°58°20%⌄
Day≈72–82°
Night≈53–64°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Tuesday 29/9 Partly cloudy (climatological)
76°58°20%⌄
Day≈71–82°
Night≈52–63°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Wednesday 30/9 Light rain (climatological)
73°56°1.7 mm⌄
Day≈68–79°
Night≈51–62°
Precip≈0.6 in / September
(climatological)Typical range for these dates · 1991–2020
Thursday 1/10 Partly cloudy (climatological)
58°43°20%⌄
Day≈53–64°
Night≈38–49°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Friday 2/10 Partly cloudy (climatological)
61°45°20%⌄
Day≈56–67°
Night≈40–50°
Precip≈0.6 in / October
(climatological)Typical range for these dates · 1991–2020
Saturday 3/10 Light rain (climatological)
65°47°1.5 mm⌄
Day≈60–71°
Night≈42–53°
Precip≈0.6 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 Harleysville, 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.