Fresno weather in September

In September, Fresno sees average daytime highs of 29°C and overnight lows near 17°C, with 31 mm of rain across 5.7 wet days and about 12 hours of daylight. It is the 1st-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 29°C through the month. The sky is clear or mostly clear about 4% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 06 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is Fresno's 7th-clearest and 4th-windiest month. For the whole year in context, see Fresno's year-round climate.

Daytime high
29°
1st warmest
Overnight low
17°
7th coldest
Rainfall
31 mm
5.7 wet days
Daylight
12 hours
5:54 AM – 5:55 PM
Cloud cover
81%
7th clearest
Wind
4 km/h
4th windiest
Solar energy
5.64 kWh/m²
Travel score
5.8
out of 10

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 29°C through the month.

A typical September day in Fresno reaches about 29°C in the afternoon and slips back to 17°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 26°C and 31°C. Set against its neighbours, September runs on par with August and about 2°C warmer than October.

15°20°25°30°35°151015202530
Avg high (°C)Avg low (°C)
12917
22917
32917
42917
52917
62917
72917
82917
92917
102917
112917
122917
132917
142917
152917
162917
172917
182917
192817
202817
212817
222817
232817
242817
252817
262817
272817
282817
292817
302817

Fresno weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysDaylight (hours)Travel score
Jan27° / 16°738.411.76.6
Feb27° / 17°618.511.86.3
Mar27° / 17°11112.4125.8
Apr27° / 17°11511.812.15.6
May27° / 17°859.712.26.0
Jun27° / 17°82.312.36.9
Jul28° / 17°61.712.36.9
Aug29° / 17°71.812.26.3
Sep29° / 17°315.7125.8
Oct27° / 17°1881411.95.4
Nov26° / 17°24017.511.85.1
Dec26° / 17°13412.511.75.9

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 4% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% of September, with mostly cloudy or overcast conditions the remaining 86%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
11882
21783
31783
41783
51783
61783
71783
81684
91783
101783
111585
121486
131486
141486
151387
161387
171387
181288
191288
201288
211189
221189
231189
241090
251090
261090
271090
28892
29892
30892

Chance of precipitation in September

Any precipitation

Fresno gets around 31 mm of rain over 5.7 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 19% and peaks near 31% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%151015202530
Rain chance (%)
19
210
310
411
512
612
713
814
915
1015
1116
1217
1317
1418
1519
1619
1720
1820
1921
2022
2122
2223
2324
2425
2526
2627
2728
2829
2930
3031

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 52% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1653050
2653050
3662950
4652960
5652960
6652960
7642970
8642970
9623080
10623080
11613180
12603190
13593290
145733100
155634100
165435110
175336110
185137120
194938130
204740130
214541140
224342150
234143150
244043160
253844171
263744181
273544191
283444201
293344221
303244231

Wind in September

Winds average 4 km/h in September.

Across September, daily wind ranges from about 4 km/h on the calmest days to 5 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (km/h)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 06 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over September. Sunrise moves from 5:57 AM to 5:51 AM, and sunset from 6:03 PM to 5:48 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.15:576:03
212.15:576:02
312.15:566:02
412.15:566:01
512.15:566:01
612.15:566:00
712.15:566:00
812.15:555:59
912.15:555:59
1012.15:555:58
1112.15:555:58
1212.05:555:57
1312.05:545:57
1412.05:545:56
1512.05:545:56
1612.05:545:55
1712.05:535:55
1812.05:535:54
1912.05:535:54
2012.05:535:53
2112.05:535:53
2212.05:525:52
2312.05:525:52
2412.05:525:51
2512.05:525:51
2612.05:515:50
2712.05:515:50
2812.05:515:49
2912.05:515:49
3012.05:515:48

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 5.64 kWh/m².

For context, solar energy here swings from a low near 4.53 kWh/m² to a high of 5.91 kWh/m² in August across the year — September's 5.64 kWh/m² sits near the top of that range.

0246151015202530
Solar energy (kWh/m²)Level
15.9Bright
25.9Bright
35.9Bright
45.9Bright
55.8Bright
65.8Bright
75.8Bright
85.8Bright
95.8Bright
105.8Bright
115.8Bright
125.7Bright
135.7Bright
145.7Bright
155.7Bright
165.6Bright
175.6Bright
185.6Bright
195.6Bright
205.5Bright
215.5Bright
225.5Bright
235.5Bright
245.5Bright
255.4Bright
265.4Bright
275.4Bright
285.3Bright
295.3Bright
305.3Bright
Planning a trip in September

Hazard calendar for Fresno

In seasonPeak

None of Fresno's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Fresno's rainy season runs October–December, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is September a good time to visit Fresno?

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

5.8
Sightseeing
8th-best month of the year
7.0
Beach & pool
4th-best month of the year

September is a reasonable time to visit Fresno for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Fresno in September

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

In September, Fresno sees daytime highs around 29°C and nights near 17°C. Pack light clothes. Worth having: sun protection. About 6 days see rain.

light clothessun protection

UV index in Fresno in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 15 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fresno peaks around February 21 at about 16 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 17 at about 12 (extreme).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecExtremeFeb 21UV 16Jun 17UV 12
UV index (midday)Level
Jan14Extreme
Feb16Extreme
Mar16Extreme
Apr13Extreme
May14Extreme
Jun12Extreme
Jul13Extreme
Aug13Extreme
Sep15Extreme
Oct14Extreme
Nov13Extreme
Dec12Extreme

Air quality in Fresno in September

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.

Air quality in Fresno is worst in March — around 31 µg/m³ PM2.5 (moderate), and holds fairly steady the rest of the year.

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateMar 1730 µg/m³Jul 1320 µg/m³
PM2.5 (µg/m³)Level
Jan22Moderate
Feb26Moderate
Mar31Moderate
Apr27Moderate
May23Moderate
Jun21Moderate
Jul20Moderate
Aug23Moderate
Sep24Moderate
Oct21Moderate
Nov20Moderate
Dec21Moderate
Location & terrain

Where is Fresno?

Fresno sits at 5.2°N, 75.0°W, 1,467 m above sea level, in Colombia. The nearest listed city is Padua, 12 km away.

Topography around Fresno

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

Within 3 km, the terrain around Fresno has large variations in elevation — a maximum elevation change of 1,017 m around an average of 1,388 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 2,399 m; within 80 km, extreme variations in elevation — a maximum elevation change of 5,113 m.

The land around Fresno is covered by trees (76%) and grassland (21%) within 3 km, trees (80%) within 16 km, and trees (68%) and grassland (30%) within 80 km.

3 km
1,017 m
16 km
2,399 m
80 km
5,113 m
treesgrasslandcroplandartificial surfaces
September weather nearby: Padua 12 km · San Sebastián de Mariquita 17 km · Manzanares 17 km · Líbano 26 km · Honda 34 km · Lérida 35 km · Guaduas 50 km · La Dorada 53 km

Colombia travel facts

Travel advisory
Level 3
Reconsider Travel
Power plugs
Type A / B
120 / 240 V · 60 Hz
Prices
≈ 38% of US
price level, 2025
GDP per capita
$8,562
2025
Happiness
6.0 / 10
World Happiness, 2025
Safe drinking water
74%
of population, 2024
Homicide rate
24.9
per 100k, 2023
Road deaths
15.4
per 100k/yr, 2019
Income group
Upper middle
World Bank
English
Low
EF EPI 480
Religion
Roman Catholic 64%Protestant 17%none 14%atheist 1%

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 Fresno (5.1526°, -75.0362°, elevation 1,467 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).