Fortuna, United States experiences average highs of 17°C (63°F) and lows of 10°C (50°F) throughout the year. Rainfall is moderate, averaging about 8 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. Average highs have stayed broadly stable across the available records.
Fortuna, United States Weather & Climate 2026
Monthly climate averages for Fortuna, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: May–Oct 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.7/10
Best: July, August, September
UV Index
5
Low
Temperature 17°C / 10°C
Feels Like 16°C / 8°C
Rainy Days 8
Rainfall 100 mm
Sunshine 9 h
Humidity 84%
Wind Speed 18 km/h
Dew Point 10°C
Snow Days 2 days
Hottest Month
22°C
August
Avg Low14°C
Rain1days
Coldest Month
6°C
February
Avg High13°C
Rain12days
Driest Month
1days
July
Avg High21°C
Avg Low13°C
Windiest Month
20 km/h
February (Gusts 50)
Sea Temperature
11°C – 14°C
Warmest water: September (
14.4°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to frequent rain.
Sun Position
Sunrise 05:47
Daylight 15.1h
Sunset 20:50
Live conditions—
Fortuna on the map · live conditions
Fortuna, United States
- Continent
- Americas
- Country
- United States
- City
- Fortuna
- Population
- 12K
- Elevation
- 20 m
- Coordinates
- 40.60°, -124.16°
Seasonal Breakdown
Spring
Mar–May
Avg High 15°C
Avg Low 8°C
Rain 10 days/mo
Summer
Jun–Aug
Avg High 20°C
Avg Low 13°C
Rain 1 days/mo
2/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 11°C
Rain 7 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 13°C
Avg Low 7°C
Rain 14 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 13°C / 7°C . Feb: 13°C / 6°C . Mar: 13°C / 7°C . Apr: 15°C / 8°C . May: 16°C / 10°C . Jun: 19°C / 11°C . Jul: 21°C / 13°C . Aug: 22°C / 14°C . Sep: 21°C / 14°C . Oct: 19°C / 11°C . Nov: 15°C / 9°C . Dec: 13°C / 7°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 238 mm. Feb: 169 mm. Mar: 195 mm. Apr: 84 mm. May: 48 mm. Jun: 11 mm. Jul: 1 mm. Aug: 3 mm. Sep: 20 mm. Oct: 74 mm. Nov: 162 mm. Dec: 199 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 85%. Feb: 85%. Mar: 85%. Apr: 83%. May: 84%. Jun: 82%. Jul: 82%. Aug: 82%. Sep: 83%. Oct: 84%. Nov: 86%. Dec: 86%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 20 km/h . Feb: 20 km/h . Mar: 20 km/h . Apr: 19 km/h . May: 20 km/h . Jun: 19 km/h . Jul: 18 km/h . Aug: 16 km/h . Sep: 16 km/h . Oct: 17 km/h . Nov: 17 km/h . Dec: 18 km/h .
Sunshine
Sunshine
Sunshine: Jan: 6h. Feb: 7h. Mar: 8h. Apr: 10h. May: 12h. Jun: 13h. Jul: 13h. Aug: 12h. Sep: 11h. Oct: 9h. Nov: 7h. Dec: 5h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 11°C . Feb: 11°C . Mar: 11°C . Apr: 11°C . May: 12°C . Jun: 12°C . Jul: 13°C . Aug: 14°C . Sep: 14°C . Oct: 13°C . Nov: 12°C . Dec: 11°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 6. May: UV 7. Jun: UV 8. Jul: UV 8. Aug: UV 7. Sep: UV 6. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 0 days. Feb: 1 days. Mar: 2 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 0 days. Dec: 0 days.
Climate Trends
Average highs have stayed broadly stable across the available records. Average rainfall is trending drier by about 20 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 22°C | Aug · 22°C |
| Coldest month | Jan 2025 · 6°C | Feb · 6°C |
| Wettest month | Dec 2025 · 285 mm | Jan · 238 mm |
| Windiest month | Mar 2025 · 22 km/h | Feb · 20 km/h |
Month-by-Month Weather Table
January
Wet 
February
Fair 
March
Wet April
Fair May
Good June
Good July best
Excellent August best
Excellent September best
Excellent October
Good November
Fair December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 13°C / 7°C | 11°C / 4°C | 16days (238 mm) Wet | 5.5h Fair | 85% Humid | 2.3 Moderate | Wet | View Details |
| February | 13°C / 6°C | 10°C / 3°C | 12days (169 mm) Wet | 7h Good | 85% Humid | 3 Moderate | Fair | View Details |
| March | 13°C / 7°C | 11°C / 4°C | 15days (195 mm) Wet | 8.1h Good | 85% Humid | 4.2 Moderate | Wet | View Details |
| April | 15°C / 8°C | 13°C / 6°C | 9days (84 mm) Wet | 9.9h Good | 83% Humid | 6.1 High | Fair | View Details |
| May | 16°C / 10°C | 16°C / 8°C | 6days (48 mm) Good | 11.6h Excellent | 84% Humid | 7.4 Very High | Good | View Details |
| June | 19°C / 11°C | 19°C / 10°C | 2days (11 mm) Excellent | 12.8h Excellent | 82% Humid | 7.8 Very High | Good | View Details |
| July best | 21°C / 13°C | 21°C / 12°C | 1days (1 mm) Excellent | 12.9h Excellent | 82% Humid | 8 Very High | Excellent | View Details |
| August best | 22°C / 14°C | 23°C / 14°C | 1days (3 mm) Excellent | 12.3h Excellent | 82% Humid | 7.3 Very High | Excellent | View Details |
| September best | 21°C / 14°C | 22°C / 13°C | 2days (20 mm) Excellent | 10.7h Excellent | 83% Humid | 5.9 High | Excellent | View Details |
| October | 19°C / 11°C | 18°C / 10°C | 6days (74 mm) Good | 8.9h Good | 84% Humid | 4.3 Moderate | Good | View Details |
| November | 15°C / 9°C | 14°C / 7°C | 12days (162 mm) Wet | 6.8h Fair | 86% Very Muggy | 2.8 Moderate | Fair | View Details |
| December | 13°C / 7°C | 11°C / 5°C | 13days (199 mm) Wet | 5.3h Fair | 86% Very Muggy | 2 Low | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Fortuna are July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Fortuna, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Fortuna is August, with average daytime highs of 22°C (71°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Fortuna is February, with average overnight lows of 6°C (44°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Fortuna is January, averaging 238mm of precipitation across 16 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Fortuna runs through January, March, December, February, with the heaviest rainfall in January. Based on 10-year averages for Fortuna.
Fortuna receives approximately 112 sunshine hours per year. The sunniest month is July with around 13 hours. Based on climate data for Fortuna.
The least favorable months to visit Fortuna are January, February, March, December, primarily due to frequent rain. For the best conditions, consider July, August, September instead.
The annual average UV index in Fortuna is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Fortuna is 84%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Sea temperatures in Summer average 12°C (54°F), which most swimmers will find too cold without a wetsuit.
Yes, Fortuna receives snow. Months with snowfall average 2 snow days and 2 cm (1 in) of accumulation, with about 0 frost days during winter.
Average wind speeds in Fortuna are 18 km/h (11 mph). The windiest month is February with peak winds reaching 20 km/h (13 mph) (gusts up to 50 km/h / 31 mph).
Fortuna averages 4 clear-sky days per month with overall cloud cover around 58%. The clearest skies occur in October.
The annual average dew point in Fortuna is 10°C (50°F), which feels pleasant with low humidity. Outdoor activities are comfortable year-round from a humidity standpoint.
Fortuna has a Warm-Summer Mediterranean climate, classified as Csb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Fortuna ranges from 8°C (46°F) to 16°C (61°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Fortuna. It earns a climate score of 8.1/10 with Good.
For June in Fortuna, pack Warm evening layer, Comfortable walking shoes. With average highs of 19°C (65°F) and 2 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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